CA1329608C - Oligomerization to alpha-olefins - Google Patents
Oligomerization to alpha-olefinsInfo
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- CA1329608C CA1329608C CA000542205A CA542205A CA1329608C CA 1329608 C CA1329608 C CA 1329608C CA 000542205 A CA000542205 A CA 000542205A CA 542205 A CA542205 A CA 542205A CA 1329608 C CA1329608 C CA 1329608C
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- C07C2/02—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms by addition between unsaturated hydrocarbons
- C07C2/04—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms by addition between unsaturated hydrocarbons by oligomerisation of well-defined unsaturated hydrocarbons without ring formation
- C07C2/06—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms by addition between unsaturated hydrocarbons by oligomerisation of well-defined unsaturated hydrocarbons without ring formation of alkenes, i.e. acyclic hydrocarbons having only one carbon-to-carbon double bond
- C07C2/08—Catalytic processes
- C07C2/26—Catalytic processes with hydrides or organic compounds
- C07C2/36—Catalytic processes with hydrides or organic compounds as phosphines, arsines, stilbines or bismuthines
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- B01J31/2208—Oxygen, e.g. acetylacetonates
- B01J31/2226—Anionic ligands, i.e. the overall ligand carries at least one formal negative charge
- B01J31/2252—Sulfonate ligands
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- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
- B01J31/24—Phosphines, i.e. phosphorus bonded to only carbon atoms, or to both carbon and hydrogen atoms, including e.g. sp2-hybridised phosphorus compounds such as phosphabenzene, phosphole or anionic phospholide ligands
- B01J31/2404—Cyclic ligands, including e.g. non-condensed polycyclic ligands, the phosphine-P atom being a ring member or a substituent on the ring
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- C08F10/00—Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F10/02—Ethene
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- B01J2231/00—Catalytic reactions performed with catalysts classified in B01J31/00
- B01J2231/20—Olefin oligomerisation or telomerisation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
- B01J2531/10—Complexes comprising metals of Group I (IA or IB) as the central metal
- B01J2531/16—Copper
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- B01J2531/60—Complexes comprising metals of Group VI (VIA or VIB) as the central metal
- B01J2531/62—Chromium
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- B01J2531/80—Complexes comprising metals of Group VIII as the central metal
- B01J2531/84—Metals of the iron group
- B01J2531/845—Cobalt
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- B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
- B01J2531/80—Complexes comprising metals of Group VIII as the central metal
- B01J2531/84—Metals of the iron group
- B01J2531/847—Nickel
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- C07C2527/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
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- C—CHEMISTRY; METALLURGY
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- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2531/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- C07C2531/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
- C07C2531/24—Phosphines
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Abstract
OLIGOMERIZATION TO ALPHA-OLEFINS
Abstract of the Invention An oligomerization or cooligomerization process comprising passing ethylene or a mixture of ethylene and propylene in contact with a catalyst, in the liquid phase, said catalyst comprising the reaction product of (i) a transition metal compound wherein the transition metal is selected from the group consisting of nickel, chromium, cobalt, iron, and copper, and mixtures thereof; (ii) in the event that (a) the transition metal is not in the oxidation state of 0 or (b) the transition metal compound does not have a hydride or an alkyl, alkenyl, alkynyl, or aryl group bonded to the transition metal, a catalyst activator consisting of a compound capable of transferring a hydride or an alkyl, alkenyl, alkynyl, or aryl group from itself to the transition metal/ligand (hereinafter defined) complex formed by the reaction of the transition metal compound with the ligand and bonding the group to the transition metal, said activator being present in a sufficient amount to activate the catalyst; and (iii) at least one organophosphorus sulfonate ligand containing (a) at least one benzene ring having a trivalent phosphorus atom located at one position on the benzene ring and an SO3M group located at a position on the benzene ring ortho thereto, or at least one benzene ring having a trivalent phosphorus atom connected through a methylene group to a first position on the benzene ring and an SO3M group connected through a methylene group to a second position on the benzene ring ortho to the first position, or at least one bridging or fused aromatic ring system having a trivalent phosphorus atom and an SO3M group, each located on a different aromatic ring in the system at substituent positions adjacent to one another, or at least one aromatic ring, other than a benzene ring, or heteroaromatic ring, each ring having a trivalent phosphorus atom and an SO3M group located at substituent positions adjacent to one another, wherein M is selected from the group consisting of hydrogen, alkali metals, alkaline earth metals, and NR4 and PR4 wherein R is a hydrogen atom or a substituted or unsubstituted hydrocarbyl radical having 1 to 15 carbon atoms and each R can be alike or different or (b) a trivalent phosphorus atom connected through a group having the formula to an SO3M group wherein A is an oxygen atom, an NH radical, or an NR
radical; R2 and R3 are hydrogen atoms or a substituted or unsubstituted hydrocarbyl radical having 1 to 6 carbon atoms and can be alike or different; x is an integer 0 or 1; y is an integer from 1 to 3: and R and M are as defined above.
Abstract of the Invention An oligomerization or cooligomerization process comprising passing ethylene or a mixture of ethylene and propylene in contact with a catalyst, in the liquid phase, said catalyst comprising the reaction product of (i) a transition metal compound wherein the transition metal is selected from the group consisting of nickel, chromium, cobalt, iron, and copper, and mixtures thereof; (ii) in the event that (a) the transition metal is not in the oxidation state of 0 or (b) the transition metal compound does not have a hydride or an alkyl, alkenyl, alkynyl, or aryl group bonded to the transition metal, a catalyst activator consisting of a compound capable of transferring a hydride or an alkyl, alkenyl, alkynyl, or aryl group from itself to the transition metal/ligand (hereinafter defined) complex formed by the reaction of the transition metal compound with the ligand and bonding the group to the transition metal, said activator being present in a sufficient amount to activate the catalyst; and (iii) at least one organophosphorus sulfonate ligand containing (a) at least one benzene ring having a trivalent phosphorus atom located at one position on the benzene ring and an SO3M group located at a position on the benzene ring ortho thereto, or at least one benzene ring having a trivalent phosphorus atom connected through a methylene group to a first position on the benzene ring and an SO3M group connected through a methylene group to a second position on the benzene ring ortho to the first position, or at least one bridging or fused aromatic ring system having a trivalent phosphorus atom and an SO3M group, each located on a different aromatic ring in the system at substituent positions adjacent to one another, or at least one aromatic ring, other than a benzene ring, or heteroaromatic ring, each ring having a trivalent phosphorus atom and an SO3M group located at substituent positions adjacent to one another, wherein M is selected from the group consisting of hydrogen, alkali metals, alkaline earth metals, and NR4 and PR4 wherein R is a hydrogen atom or a substituted or unsubstituted hydrocarbyl radical having 1 to 15 carbon atoms and each R can be alike or different or (b) a trivalent phosphorus atom connected through a group having the formula to an SO3M group wherein A is an oxygen atom, an NH radical, or an NR
radical; R2 and R3 are hydrogen atoms or a substituted or unsubstituted hydrocarbyl radical having 1 to 6 carbon atoms and can be alike or different; x is an integer 0 or 1; y is an integer from 1 to 3: and R and M are as defined above.
Description
3296~8 OL I GOMER I ZAT I ON TO ALPHA-OLEF I NS
Technical Field This invention relates to an oligomerization process for the production of alpha-olefins and a catalyst therefor.
Backqround Art Linear alpha-olefins having 4 to 20 carbon atoms are key feedstocks in the production of surfactants, plasticizers, synthetic lubricants, and polyolefins. High purity alpha-olefins are particularly valuable in the production of low density polyethylene and in the oxo process.
The most successful processes for the production of alpha-olefins to date are those catalyzed by nickel complexes of phosphine-carboxylate ligands and sulfonated ylide/nickel type compounds. While these catalysts are quite active and have good selectivity insofar as the production of alpha-olefins is concerned, the art is continuously searching for ethylene oligomerization catalysts, which display higher activity and greater alpha-olefin selectivity and allow for a more economical process.
For example, insofar as economy is concerned, the process utilizing the nickel complexes of phosphine-carboxylate ligands requires three reaction steps: ethylene oligomerization, isomerization of C20+ product, and disproportionation of C20+ internal olefins to Cll to C14 internal olefins. The latter two steps are necessary because C20+ olefins have D--15,388 .
little co~mbrcial value. The high level of internal olefin production also raises a problem of purity important, as noted, in the production of low density polyethylene and the oxo process. Other disadvantages of these catalysts follow: the lig nds are expensive to prepare; polyethylene formation must be guarded against; the catalysts are relatively unstable; solvent is degraded; and ethylene pressure requirements are high. The sulfonated ylide/nickel type catalysts suffer from similar deficiencies.
Disclosure of Invention An object of this invention, therefore, is to provide a procPss for oligomerization to alpha-olefins, which (i) utilizes a catalyst having a higher activity than, and an improved selectivity over, its predecessor catalysts and (ii) is more economical than comparable prior art processes.
Other objects and advantages will become apparent hereinafter.
According to the present invention an economic process for the oligomerization of ethylene, or cooligomerization of ethylene and propylene, to alpha-olefins utilizing a catalyst having a substantial~y higher activity and greater selectivity than catalysts heretofore used for similar purposes has been discovered. The process comprises passing ethylene or a mixture of ethylene and propylene in contact with a catalyst, in the liquid phase, said catalyst comprising the reaction product of (i) a transition met~l compound wherein the transition metal is selected from the group D-15,388 _ 3 _ 132 96 G8 consisting of nickel, chromium, cobalt, iron, and copper, and mixtures thereof; (ii) in the event that (a) the transition metal is not in the oxidation state of zero or (b) the transition metal compound does not have a hydride or an alkyl, alkenyl, al~ynyl, or aryl group bonded to the transition metal, a catalyst activator consisting of a compound or compounds capable of transferring a hydride or an alkyl, alkenyl, alkynyl, or aryl group from itself to the transition metal/ligand (hereinafter defined) complex formed by the reaction of the transition metal compound with the ligand and bonding the group to the transition metal, said activator being present in a sufficient amount to activate the catalyst, and (iii) at least one organophosphorus sulfonate ligand containing (a) at least one benzene ring having a trivalent phosphorus atom located at one position on the benzene ring and an S03M group located at a position on the benzene ring ortho thereto, or at least one benzene ring having a trivalent phosphorus atom connected through a methylene group to a first position on the benzene ring and an S03M group connected through a methylene group to a second position on the benzene ring ortho to the first position, or at least one bridging or fused aromatic ring system having a trivalent phosphorus atom and an S03M group, each located on a different aromatic ring in the system at substituent positions adjacent to one another, or at least one aromatic ring, other than a benzene ring, or heteroaromatic ring, each ring having a triv~lent phosphorus atom and an S03M group D-15,38~
13296~8 located at substituent positions adjacent to one another, wherein M is selected from the group consisting of hydrogen, alkali metals, alkaline earth metals, and NR4 and PR4 wherein R is a hydrogen atom or a su~stituted or unsubstituted hydrocarbyl radical having 1 to 15 carbon atoms and each R can be alike or dif~erent, or (b~ a trivalent phosphorus atom connected through a group having the formula r ~
(-A-) - C y to an SO3M group _R3 whereîn A is an oxygen atom, an NH radical, or an NR
radical; R2 and R3 are hydrogen atoms or a substituted or unsubstituted hydrocarbyl radical having 1 to 6 carbon atoms and can be alike or different; x is an integer 0 or 1; y is an integer from 1 to 3; and R and M are as defined above.
Detailed DescriPtion The products of subject process are chiefly alpha-olefins of even carbon numbers. The molecular weight distribution of oligomers depends upon several reaction variables; however, the structure of the particular ligand used in the catalyst has a strong influence on the result. One catalyst, for example, produces mainly C4 to C12 alpha-olefins plus lesser and ever diminishing amounts of higher alpha-olefins resulting in a high overall selectivity to the C4 to C20 range. Other catalysts yield higher or lower molecular weight D-15,388 - 13296~8 distributions depending mainly on the size of their ligand cone angles. The cone angle is determined as described by C.A. Tolman in the Journal of the American Chemical Society, volume 92, 1970, page 2956 and in Chemical Reviews, volume 77, 1977, page 313. Cone angles are also discussed in United States patent numbers 4,169,861 and 4,201,728.
With regard to the ortho-sulfonate aspect of this invention, if one assumes that the ortho-sulfonate group exhibits about the same cone angle effect as an ortho-methyl group, then the calculated cone angles can have an average value in the range of about 120 degrees to about 200 degrees and a preferred average value in the range of about 150 degrees to about 180 degrees. Larger ligand cone angles usually give higher molecular weight distributions when the catalysts are compared under matched reaction conditions. With larger cone angle ligands, oligomer distribution usually goes beyond C20 in significant proportions. Reactivity increases with increasing cone angle up to 180 and then falls off. Other reaction parameters such as temperature, ethylene pressure, and solvent also influence oligomer distribution. Alpha content is increased by lowering reaction temperature, lowering catalyst concentration, and/or increasing ethylene pressure.
As previously noted, alpha-olefins produced by ethylene oligomerization have even carbon numbers. Subject catalysts are practically inert to propylene; however, when a mixture of ethylene and - 6 - 13296~8 propylene is present, both even and odd numbered olefins have been observed.
The catalyst is the reaction product of three components, i.e., (i) a transition metal compound (ii) a catalyst activator, and (iii) an organophosphorus sulfonate ligand.
The transition metal compound can be an organometallic compound, an organic salt, or an inorganic salt wherein the transition metal is selected from the group consisting of nickel, chromium, cobalt, iron, copper, and mixtures thereof. The transition metals are preferably in the following oxidation states: nickel - O or 2, chromium, cobalt, and iron - O, 1, 2, or 3; and copper - O, 1, or 2. Where the compound is a salt, the hydrated form is preferred. Metal salts are preferred, particularly the halides, sulfonates, benzenesulfonates, and tetrafluoroborates. Useful metal compounds are the chlorides, bromides, iodides, fluorides, hydroxides, carbonates, chlorates, ferrocyanides, sulfates, hexafluorosilicates, trifluoromethanesulfonates, nitrates, sulfides, selenides, silicides, cyanides, chromates, phenoxides, dimethyldithiocarbamates, hexafluoroacetylacetonates, molybdates, phosphates, oxides, stannates, sulfamates, thiocyanates, cyanates, titanates, tungstates, cyclopentadienides, formates, acetates, hydroxyacetates, propionates, hexanoates, oxalates, benzoates, cyclohexanebutyrates, naphthenates, citrates, dimethylglyoximes, acetylacetimides, phthalocyanines, and bis-cyclooctadienes. The D-15,388 _ 7 _ 13296~8-nickel salts, particularly those of sulfonate, tetrafluoroborate, and chloride hexahydrate, are preferred. Nickel typically gives the most active catalysts followed by chromium, copper, cobalt, and iron, in that order. Some nickel catalysts are about 50 times more reactive than chromium catalysts. On the other hand, some chromium catalysts have shown very high alpha-olefin selectivities. Mixtures of the various transition metal compounds can be used.
Specific examples of useful transition metal compounds are NiC12(anhydrous), nickel bis-cyclooctadiene, NiC12-6H20, Ni(BF4)2-6H2o ~iS04-6H20, ~iBr2-x H20, Ni(II)acetylacetonate, NiG12-dimethoxyethane, ~i(OH)2, hexamminenickel(II) chloride, nickel benzoate, nickel fluoride-4H20, nickel tosylate-6H20, nickel acetate-4H20, chromium(III) chloride-6H20, chromium(II) chloride, cupric chloride-2H20, FeC12-4H20, and cobalt(II) acetate-4H20.
The catalyst activator can be any reagent capable of activating the catalyst under oligomerization conditions. They can be selected from among the cocatalysts well known in the art of ethylene or propylene polymerization or oligomerization. Preferred catalyst activators are reagents considered to be capable of transferring a hydride or an alkyl, alkenyl, alkynyl, or aryl group from itself to the metal/ligand complex formed by the reaction of the metal salt with the ligand and bonding the group to the transition metal, said activator being present in a sufficient amount to D-15,388 - 8 ~ 1 32 9 6 ~8 activate the catalyst, Where the transition metal compound already has a hydride or an alkyl, alkenyl, alkynyl, or aryl group bonded to the transition metal and the metal is in the zero oxidation state, the catalyst activator is not required. Useful activators are borohydrides, aryl boranes, borane (BH3), mono-, di-, and trialkyl boranes, aryl borates, tri and tetra coordinate organoaluminum compounds, aluminum hydrides, tri and tetra alkyl boron compounds, organozinc compounds, and mixtures thereof. The borohydrides can be alkali metal borohydrides, quaternary ammonium borohydrides wherein the ammonium cation is R4N~, each R
being aliXe or different and selected from the group consisting of hydrogen and alkyl radicals having 1 to 10 carbon atoms; and alkali metal alkoxyborohydrides, phenoxyboro- hydrides, or amidoborohydrides wherein there are 1 to 3 alkoxy, phenoxy, or amido groups and each group has 1 to 10 carbon atoms. The aryl borane compounds can have 1 to 3 aromatic rings and the aryl borates can have 1 to 4 aromatic rings. All of the various aryl, alkyl, or alkoxy groups can be substituted or unsubstituted. Mixtures of the various boron compounds can be used. Examples are sodium borohydride, potassium borohydride, lithium borohydride, sodium trimethylborohydride, potassium tripropoxy-borohydride, tetramethylammoniumboro-hydride, triphenylborane, sodium tetraphenylborate, lithium tetraphenylborate, sodium hydrido tris(l-pyrazolyl) borate, potassium dihydro bis(l-pyrazolyl) borate, lithium D-15,3~8 - 9 - 13296~8 triethylborohydride, 1ithium tri-sec-butylborohydride, potassium tri-sec-butylborohydride, sodium cyanoborohydride, zinc borohydride, bis(triphenylphosphine) copper (I) borohydride, potassium tetraphenylborate, lithium phenyltriethylborate, lithium phenyltrimethoxyborate, sodium methoxytriphenylborate, sodium diethylaminotriphenylborate, and sodium hydroxytriphenylborate. In general, boranes derived from olefin hydroboration are suitable. These boranes can be BH3, triethylborane, dicyclohexylborane, t-hexylborane, diethylborane, ethylborane, 9-borabicyclononane [3,3,1] nonane, tricyclohexylborane, and catecholborane. Sodium tetraphenyiborate gives a more active catalyst than sodium borohydride, the difference in activity often being twofold. A mixture of triphenyl borane and sodium borohydride gives activities similar to sodium tetraphenylborate. Even though sodium tetraphenylborate gives a more active catalyst than sodium borohydride, sodium borohydride may be economically favored in some circumstances. Certain organophosphorus sulfonates do not appear to be very stable to treatment with borohydrides. Phosphonito sulfonates and phosphito sulfonates are examples.
In this case, the use of tetraphenylborate or other organo borates or organo boranes are preferred.
Examples of tri and tetra coordinate organoaluminum compounds are triethylaluminum, diisobutylaluminum hydride, diisobutylaluminum chloride, diethylaluminum cyanide, lithium D-15,388 132~6Q8 tetrabutylaluminate, sodium tetraphenylaluminate, triphenylaluminum, trimethylaluminum, trisobutylaluminum, tri-n-propylaluminum, diethylaluminum chloride, ethylaluminum dichloride, ethylaluminum sesquichloride, and methylaluminum sesquichloride. Examples of aluminum hydrides are lithium aluminum hydride, diisobutylaluminum hydride, sodium dihydrohis ~2-methoxyethoxy) aluminate, lithium diisobutylmethylaluminum hydride, sodium triethylaluminum hydride, lithium trimethoxyaluminum hydride, and potassium tri-t-buto~aluminum hydride.
The organophosphorus sulfonate ligand contains (a) at least one benzene ring having a trivalent phosphorus atom located at one position on the benzene ring and an S03M group located at a position on the benzene ring ortho thereto, or at least one benzene ring having a trivalent phosphorus atom connected through a methylene group to a first position on the benzene ring and an S03M group connected through a methylene group to a second position on the benzene ring ortho to the first position, or at least one bridging or fused aromatic ring system having a trivalent phosphorus atom and an S03M group, each located on a different aromatic ring in the system at substituent positions adjacent to one another, or at least one aromatic ring, other than a benzene ring, or heteroaromatic ring, each ring having a trivalent phosphorus atom and an S03M group located at substituent positions adjacent to one another, wherein M is selected from the group consisting of hydrogen, al~ali metals, D-15,388 alkaline earth metals, and NR4 and PR4 wherein R
is a hydrogen atom or a substituted or unsubstituted hydrocarbyl radical having 1 to 15 carbon atoms and each R can be alike or different, or (b) a trivalent phosphorus atom connected through a group having the formula (-A-)x C - y to an S03M group R3_ wherein A is an oxygen atom, an NH radical, or an NR
radical; R2 and R3 are hydrogen atoms or a substituted or unsubstituted hydrocarbyl radical having 1 to 6 carbon atoms and can be alike or different; x is an integer O or l; y is an integer from 1 to 3; and R and M are as defined above.
The phosphorus portion of the ligand can be a primary, secondary, or tertiary phosphino, phosphinito, phosphonito, phosphito, or aminophosphino group. The ligands are believed to be chelating or potentially chelating.
The organophosphorus-sulfonate is usually in the alkali metal salt form, e.g., lithium, sodium, or potassium.
Bridging ring systems are exemplified by diphenyl, the adjacent substituent positions being the ortho positions on each ring which are opposite to one another. Fused ring systems are exemplified by r.apthalene, the adjacent substituent positions being 1 and 8 and 4 and 5. Two aromatic rings that share a pair of carbon atoms are said to be fused.
Additional examples of bridging and fused ring D-15,388 - 12 13296 ~8 systems are anthracene, phenanthrene, tetralin, l-phenylnapthalene, chrysene, quinoline, isoquinoline, l,10-phenanthroline, indole, benzothiophene, acenaphthene, diphenylene, and pyrene, Typical ortho-phosphinosulfonates can be represented by the following structural formula:
R6 ~ - R5 ~ SO3M
wherein R4, R5, and R6 are hydrogen atoms or substituted or unsubstituted hydrocarbyl radicals having 1 to 20 carbon atoms, preferably 2 to 10 carbon atoms and can be alike or different; R4 and R5 can be connected to form a heterocyclic radical; and M is as set forth above.
As long as the conditions of being in ortho positions or in adjacent positions are met, the other positions on the aromatic rings can have various substituents, e.g., additional trivalent phosphorus atoms and SO3M groups and/or substituted or unsubstituted hydrocarbyl radicals having 1 to 20 carbon atoms, preferably 2 to 10 carbon atoms, and the substituents can be alike or different. Thus, the phosphorus to sulfonate ratio does not have to be one to one, but can be, for example, 2 to 1, 1 to 2, and 2 to 4. Illustrative hydrocarbyl radicals are alkyl, aryl, alkoxy, or aroxy. Other substituents can be, e.g., amino or amido groups. Examples of substituents on the rings D-15,388 - 13 - 13296G~
of the aryl and aroxy radicals are mentioned below, Sulfonated aromatics, which ca~ be converted to the organophosphorus sulfonates useful in subject invention, may be found in the Aldrich Catalog Handbook of Fine Chemicals, 1986-1987, published by Aldrich Chemical Company, Inc., Milwaukee, Wisconsin, on pages 25, 28, 82, 107, 115, 131, 132, 154, 289, 350, 593, 6S2, 6B5, 771, 969, 970, 982, 988, 1146, 1147, 1150, 1159, ll9g, 1210, 1211, 1266, 1268, and 1278 designated as 21,042-0; 21,043-9;
21,044-7; 20,183-9; 85,740-8; 21,456-6; 21,033-1;
21,057-9; 20,196-0; 20,200-2; 20,193-6; 30,198-7;
21,036-6; 20,194-4; 21,037-4; 14,644-7; A8,680-5;
10,798-0; A9,277-5; B315-9; 25,980-2; 10,814-6;
13,507-0; 19,982-6; 13,369-8; 22,845-1; 22,847-8;
28,995-7; E4,526-0; 18,381-4; H5,875-7; 27,637-5;
25,089-9; N60-5; 18,634-1; 24,954-8; 18,722-4;
27,490-9; 22,519-3; P6,480-4; 27,198-5; 85,616-9;
Q150-6; 24,307-8; 24,253-5; 11,273-9; 16,720-7;
26,146-7; 18,495-0; 25,533-5; 10,456-6; T3,592-0;
and 16,199-3. It should be noted that among the aromatics which underlie the aromatic sulfonates can be aromatics having the basic structural formula of pyridine, quinoline, and thiophene.
Typical alkylene-phosphorus sulfonates can be represented by the following structural formula:
_ _ R4 ,R2 R ~ P ~ (A)x ~ C y SO3M
- R3_ D-15,388 - 14 - 13296~
wherein R2, R3, R4, and R5 are as set forth above and can be alike or different, and A, M, x, and y are also as set forth above.
R R2 R3 R4 R5 and R6 can as noted above, be hydrogen atoms, substituted or unsubstituted hydrocarbyl radicals, and alike or different They can be alkyl, aryl, alkoxy, aroxy, amino, or amido radicals, or mixtures of these radicals. The radicals can be separate from one another or cojoined.
Examples of substituents, which can be present on the rings of the aryl and aroxy radicals follow: bromo, chloro, fluoro, trifluoromethyl, iodo, lithio, alkyl, aryl, fused aryl, alkoxy, aroxy, cyano, nitro, hydroxy, amino, amido, ammonium, formyl, acyl, acetoxy, carbonyloxy, oxycarbonyl, phenylcyclohexyl, phenylbutenyl, tolyl, xylyl, para-ethylphenyl, pentafluorophenyl, phenoxy, hydroxymethyl, thio, sulfonato, sulfonyl, sulfinyl, s~lyl, phosphino, phosphinito, phosphonito, phosphito, phosphinato, phosphonato, sulfonamido, boro, borato, borinato, boronato, sulfinato, phosphonium, sulfonium, arsonato, and arsino.
The substituents can be ortho, meta, or para to the phosphorus atom. Up to five substituents can be present on each ring subject to the limitation on the number of carbons recited in the above generic formula. Subject to the same limitation, the aryl or aroxy radicals can be benzenoid, polyaromatic, heteroaromatic, or metal sandwiches, e.g., phenyl, thienyl, pyrryl, furyl, benzyl, pyridyl, phosphorinyl, imidizyl, naphthyl, D-15,3~8 anthracyl, phenanthryl, ferrocenyl, nickelocenyl, and chromocenyl.
Examples of alkyl and alkoxy radicals are as follows: methyl, diphenylphosphinomethyl, trifluoromethyl, ethyl, 2-cyanoethyl, 2-mercaptoethyl, 2-chloroethyl, 2-diphenylphosphinoethyl, 2-trimethylsilylethyl, 2-sulfonatoethyl, l-propyl, 3-aminopropyl, 3-diphenylphosphinopropyl, 3-sulfonatopropyl, l-butyl, l-pentyl, l-hexyl, l-heptyl, l-octyl, l-nonyl, l-decyl~ t-butyl, 1,1-dimethyl-2-phenylethyl, l,l-dimethylpropyl, 1,1,2-trimethylpropyl, l,l-dimethylbutyl, l,l-diethylpropyl, tricyclohexylmethyl, l-adamantyl, cyclopropyl, cyclobutyl, 4-heptyl, cyclopentyl, cyclopropyl, methylcyclopentyl, cyclohexyl, methylcyclohexyl, cycloheptyl, cyclooctyl, cyclododecyl, exo-norbornyl, endo-norbornyl, 2-bicyclo[2.2.2] octyl, 2-adamantyl, 2-propylheptyl, isobutyl, nopinyl, decahydronaphthyl, menthyl, neomenthyl, 2-ethylhexyl, neopentyl, isopropyl, l-phenyl-2-propyl, 2-butyl, 2-pentyl, 3-pentyl, 2-hexyl, 3-hexyl, 2-heptyl, 3-heptyl, 4-heptyl, 2-octyl, 3-nonyl, and 5-decyl.
Examples of amino and amido groups follow:
N,N-diethylamino, N,N-diphenylamino, N,N-dimethylamino, N,N-diisopropylamino, ethylamino, pyrryl, t-butylamino, anilino, succinamido, acetamido, and phthalimido.
A can be as described above; and M can be an alkali metal, an-alkaline earth metal, an ammonium or phosphonium ion, or hydrogen.
D-15,388 - 16 - 13296~8 Examples of useful ligands will be ound in Table I.
Synthesis of ortho-phosphinosulfonates is accomplished by using the known reaction of a lithium benzenesulfonate with n-butyllithium to make ortho-lithiated lithium benzenesulfonate.
Subsequent reaction with an organophosphorus halide gives the lithium salt of an ortho-organophoshorus sulfonate. These compounds can be converted to other salts by exchange reactions.
The synthesis of alkylene-phosphinosulfonates can be achieved, for example, by phosphide reaction on the sodium salt of 2-chloroethanesulfonic acid.
The molar ratio of metal salt to organophosphorus sulfonate is in the range of about ~.5 to one to about 5 to one and preferably in the range of about 0.5 to one to about 2.5 to one. The optimum ratio is considered to be about 2 to one.
The catalyst is active at lower ratios; however, alpha-olefin selectivity is somewhat lower. By using two equivalents of phosphinosulfonate per nickel in aqueous solution, for example, the catalyst partitions in the aqueous phase. In this instance, it is believed that one phosphinosulfonate serves as a catalyst and the other serves as a solubilizing agent for the catalyst.
A sufficient an.ount of catalyst activator is incorporated into the complex to activate the catalyst. In some cases, the catalyst activator ~akes on the role of redox reagent, reducing or oxidizing the transition metal to an active D-15,388 - 17 - 13296~8 oxidation state. Optimum amounts of catalyst activator in any particular system are determined by experimentation. The molar ratio of catalyst activator to metal salt is typically in the range of zero to about 5 to one and is preferably in the range of about 0.1 to one to about 3 to one. It is found that borohydride to nickel salt ratios of less than or equal to one to one give a very active catalyst in sulfolane when the nickel to ligand ratio is two. Ratios for this system ranging from 0.125 to one to one to one are most active with 0.25 to one being optimum. The ratio is also a function of the solvent used and the oxidation state of the transition metal.
The liquid phase reaction can be undertaken by dissolving catalyst in a solvent or suspending the catalyst in a liquid medium. The solvent or liquid medium should be inert to process components and apparatus under process conditions. Examples of solvents are ethanol, methanol, water, toluene, sulfolane, ethylene glycol, 1,4-butanediol, ethylene carbonate, and mixtures of the foregoing. Solvents which permit phase separation from oligomer product are preerred because product can then be isolated by decantation. Other methods of product separation such as distillation m~y require temperatures, which would be harmful to the catalyst. Examples of solvents which permit phase separation are sulfolane, water, ethylene glycol, and 1,4-butanediol. It is noted that water shifts oligomer distribution to lower molecular weights.
Some of the solvents, especially alcohols and diols, D-15,388 - 18 - 13296~8 degrade with time under process conditions. Other suitable solvents can be found in United States patents 3,676,475 and 3,737,475.
One preferred solvent for ethylene oligomerization is water. Several advantages can be realized by water-soluble/oligomer insoluble catalysts: easy processing of product by substantially complete separation of catalyst from oligomers; increased alpha-olefin selectivity by minimizing olefin isomerization caused by catalyst/oligomer contact; ability to curtail oligomer chain length; and reduction of the problem of solvent degradation.
The most preferred solvent for ethylene olisomerization is sulfolane in which the catalyst is soluble, but the oligomer is not. The advantages of sulfolane follow: good partitioning of the organophosphorus sulfonate in the sulfolane phase;
very high catalyst activity/productivity using appropriate generation ratios; good separation of catalyst from oligomers; increased alpha-olefin selectivity by minimizing olefin isomerization caused by catalyst/oligomer contact; lower catalyst usage and concentrations; lower catalyst activator usage; and reduction of the problem of solvent degradation. It should be noted that the sulfolane employed in the process can contain water and other impu!ities as long as catalyst activity is not impaired. Even when water content is sufficient to completely hydrolyze the more hydrolytically unstable catalyst activators, catalyst activit`y has been observed.
~-15,388 ..~
13296~8 -- 19 -- .
Nickel complexes of ortho-diphenyl-phosphino para-toluenesulfonate, ortho-diphenyl-phosphino-benzenesulfonate, and ortho-dicyclohexyl-phosphino-para-toluenesulfonate, when suspended in water or dissolved in water/ethanol cosolvent give oligomerization catalysts having good activity.
These catalysts do not selectively partition in the asueous phase, however, unless the iigand is present in excess over the nickel.
Optimum reaction conditions can be quite different for different ligand structures. For example, the more alkyl-phosphorus substituents in the phosphinosulfonate, the more stable the catalyst is at higher reaction temperatures. In some cases, the catalysts are more active and, therefore, lower concentrations of the catalyst are called for.
The oligomerization or cooligomerization process can be run at a temperature in the range of absut 0 degrees C to about 200 degrees C. Preferred temperatures are in the range of about 30C to about 140C. It is suggested that a commercial unit be run in the range of about 60C to about 130C.
Subject process can be run at pressures in the range of about atmospheric pressure to about 5000 psig. Preferred pressures are in the range of about 400 psig to about 2000 psig. These pressures are the pressures at which the ethylene or ethylene/propylene feed is introduced into the reactor, and at which the reactor is maintained.
Pressure influences the performance of the catalyst. Experiments with ortho-diphenylphosphino-para-toluene-sulfonate/nickel catalyst are conducted ~-15,388 at 70 degrees C and pressures of 950 psig,. 500 psig, and 200 psig in an ethanol solvent. At 200 psig, the olefin product is essentially limited to up to C12 and alpha-olefin selectivities range from 25 to 78 percent by weight. At 500 psig, olefin product is essentially limited to no more than C16, but alpha-olefin selectivities are only slightly lower than 950 psig. In contrast, experiments run in sulfolane are less responsive to changes in ethylene pressur0 and tend to produce higher molecular weight oligomer distribution.
Typical catalyst concentrations are in the range of about 10 ppm (parts per millYon) to about 1000 ppm of transition metal. The ppm is based on a million parts by weight of transition metal. Some of the more active catalysts give very high reaction rates at 40 ppm, however. A preferred range is about 0.1 ppm to about 1000 ppm (about 0.000002 mole per liter to about 0.02 mole per liter).
At high reaction rates, the reactions can be ethylene mass-transfer rate limited. At lower catalyst concentrations (100 ppm versus lOOo ppm ~i), the catalyst turnover freguency, which is defined as moles of ethylene per moles of transition metal per hour or gram ethylene per gram transition metal per hour, increases. Catalyst turnover frequency can be very high in sulfolane.
A typical catalyst activation follows:
ligand, metal salt, and a tetraphenylborate catalyst activator are dissolved in a solvent and heated to reaction temperature prior to the introduction of ethylene. Unlike borohydrides, tetraphenylborate D-15,388 - 21 - 13296~8 can be mixed with ligand and metal salt in the absence of ethylene without harming the catalyst significantly. With borohydride activator, a solution of ligand and metal salt is typically placed under 100 psig ethylene at about O to SO
degrees C and a solution of ~orohydride introduced.
Higher ethylene pressures would be better for catalyst generation. Preferred ethylene pressure is in the range of about atmospheric to about 500 psig. The catalyst generation temperature is in the range of about O degrees C and about 50 degrees C.
When mixtures of triphenylborane and borohydride are used as the activator, the triphenylborane can be added to the solution prior to or during the treatment with ethylene and borohydride at conditions within the same ranges. Triphenylborane enhances the activity of the catalyst while favoring the production of lighter alpha-olefins. The activity of a tetraphenylborate-based catalyst is higher than sodium borohydride/ethylene-based catalyst.
Subject catalysts are found to be very active. For example, a sodium salt of ortho-diphenylphosphino-para-toluenesulfonic acid~nickel chloride hexahydrate/sodium borohydride based catalyst gives good activity at ambient temperature. At 30 degrees C, 950 psi ethylene, and 1000 ppm nickel salt, a reaction rate of 0.5 gram-mole per liter per hour is noted. The products produced are about 96 to 99 percent by weight alpha-olefins in the Cg to C12 range. At higher temperatures, reaction rates are greater. In D-15,388 - 22 - 132~6~8 several tests, a minireactor is filled with oligomers within 0.5 to 2 hours. The discharged catalyst solutions contain 50 to 60 percent by weight of C4 to C20 oligomers and possess volumes close to 80 to 100 milliliters, the volume of the minireactor being 100 milliliters. Ethylene uptake slows as the reactor fills. Rates of over 15 gram-mole per liter per hour are often noted.
To determine catalyst stability, the reaction is monitored at low nickel concentrations (lOC ppm Ni versus 1000 ppm Ni). Catalyst stability for the ortho-diphenylphosphino-para-toluene sulfonic acid based catalysts appears good at or below 80 degrees C based on constant ethylene gas uptake.
In experiments with orthodiphenyl-phosphino-para-toluenesulfonic acid based catalysts, polyethylene formation is not observed when the reaction is conducted at temperatures even as low as ambient.
The lithium salt of ortho-diphenylphosphino-benzenesulfonic acid shows similar catalytic properties to the sodium salt of ortho-diphenylphosphino-para-toluenesulfonic acid.
Ligand cone angles, as noted, and phosphorus basicities influence catalyst properties. The sodium salt of ortho-dicyclohexyl-phosphino-p-toluenesulfonic acid gives a very active catalyst with nickel producing both ethylene oligomers and very low molecular weight polyethylene. Initial ethylene uptake rates with this ligand (1000 ppm Ni) are 190 gram-moles per D-15,388 .
liter per hour, Selectivity to granular polyethylene having an average molecular weight of about 900 is higher at 100 degrees C, while olefin oligomers form more readily at 130 degrees C. The ligand, being a dialkylarylphosphi.ne, shows better stability at these elevated temperatures than triarylphosphine analogs. In contrast, the sodium salt of ortho-di-tert-butyl-phosphino-para-toluenesulfonic acid possesses lower activity, which suggests that the catalyst has a sharp response to ligand cone angle: the cone angle of the tert-butyl analog being slightly larger than the cyclohexyl analog. The large cone angle of ortho-dicyclohexylphosphino-para-toluenesulfonate appears to facilitate low molecular weight polyethylene formation. The phosphorus basicity of this ligand may also influence both the activity and selectivity of the catalyst.
When triphenylphosphine is added as an auxiliary ligand to an ortho-diphenylphosphino-para-toluenesulfonate/nickel catalyst, oligomer chain length is essentially curtailed to C8 and alpha-olefin selectivity to undPr 50 percent, but polyethylene formation is not observed.
It will be understood by those skilled in the art that the operator of the process will have to make selections between the organo phosphorus sulfonate ligands, the transition metal compounds, the catalyst activators, concentrations, solvents, and reaction parameters in order to obtain the level of productivity sought.
D-15,388 ~` 132960~
In the event that the catalyst is discharged from the reactor while it is still active and recharged at a later time, activity is typically lost. If catalyst to be recharged is treated with additional catalyst activator, activity is restored. Preferably, treatment with transition metal compound and catalyst activator is used to restore activity.
The invention is illustrated by the following e~amples.
Examples 1 to 55 Synthesis of the sodium salt of 2-diphenylphosphino-4-methylbenzenesulfonic acid:
Lithium-para-toluenesulfonate is prepared first. A solution of para-toluenesulfonic acid monohydrate (190 grams, 1.0 mole) in 400 milliliters of absolute ethanol is treated with lithium hydroxide monohydrate (42 grams, 1;0 mole). After stirring for one hour, the insolubles are filtered and the filtrate is concentrated to a white solid.
The filtrate is treated with 400 milliliters of toluene and the resultant heterogeneous mixture is fitted with a condenser and refluxed for 8 hours (41 milliliters of water is azeotropically removed).
The cooled mixture is filtered and the collected solids are pulverized and dried under vacuum (dry weight 163.5 grams).
The lithium salt of 2-diphenylphosphino-4-methylbenzenesulfonic acid is then prepared and converted to the sodium salt: lithium para-toluenesulfonate (8.9 grams, 50 millimoles) is suspended in 100 milliliters of dry tetrahydrofuran D-15,388 under a nitrogen atmosphere. The resultant suspension is cooled to 0 degrees C and a sollltion of n-butyllithium in hexane (34 milliliters, 1.6 molar, 55 millimoles) is added at a dropwise rate creating an orange suspension. Thirty minutes later, diphenylchlorophosphine (11.3 grams, 51 millimoles) is added at a dropwise rate, which maintains the reaction temperature between 0 and 10 degrees C resulting in a red reaction mixture. The reaction mixture is stripped of solvents to give a solid residue, treated with 200 milliliters of distilled water to give a turbid solution, and subsequently treated with 100 milliliters of saturated sodium chloride to precipitate the sodium salt. The resultant precipitate is washed twice with ether and dried under high vacuum to a powder (12.81 gram).
Other phosphino-sulfonates can be prepared in the same manner by employing different lithium aromatic sulfonates and/or organophosphorus halides. One can stop at the lithium phosphino-sulfonate stage rather than converting it to the sodium salt. Lithium phosphino-sulfonates can be used as ligands without any formal purification other than stripping the reaction solvent. Treating the salts with strong acids can precipitate the "acid form" of the ligand. Reacting the "acid form"
of the ligand with an appropriate metal hydroxide will, in turn, give metal phosphino-sulfonates useful as ligands.
Alkylenephosphino-sulfonates are prepared by the reaction of phosphides with D-15,388 13296~
haloalkanesulfonate salts. The lithium salt of 2-dicyclohexylphosphinoethanesulfonic acid is synthesized as follows: to a solution of dicyclohexylphosphine (10.6 grams, 53.4 miilimoles) in dry tetrahydrofuran (lOo milliliters) under a nitrogen atmosphere and cooled to minus ~0 degrees C
is added n-butyllithium in hexane (1.6 molar, 31.25 milliliters, 50 millimoles). The resultant yellow mixture is allowed to warm to ambient temperature and the anhydrous sodium salt of 2-chloroethanesulfonic acid (9.25 grams, 55.5 millimoles) is added in 1 to 2 gram portions while the temperature is controlled between ambient and 41 degrees C. The resultant cloudy white solution is stripped of its solvent to give an off-white solid (18.3 grams).
The oligomerization of ethylene is carried out in a minireactor having a volume of 100 milliliters. The ethylene used is CP grade ethylene containing about 99.5 percent by weight ethylene.
All solvents used in the minireactor are either distilled under nitrogen or thoroughly sparged with nitrogen prior to use.
In examples using nickel bis(l,5-cyclooctadiene), (written as Ni(COD)2), a mixture of the solid nickel bis(l,5-cyclooctadiene) and ligand (1:1 mole ratio) is treated with the desired solvent (35 milliliters~ and introduced into the minireactor within a matter of minutes. The minireactor is pressurized with 600 psig ethylene, h~ated to the desired temperature and, typically, the pressure is adjusted to 950 psig. it is found that aging of catalyst solutions for even a few D-15,388 hours prior to use resulted in lower catalytic activity.
In examples using nickel (II) chloride hexahydrate (or other metal salts), the ligand and nickel chloride mixture is treated with the solvent (35 milliliters) charged to the minireactor, and placed under 100 psig ethylene. A 0.5 molar solution of sodium borohydride in diglyme is introduced by pressure lock syringe at ambien~
t0mperature. The reactor is quickly pressurized to 600 psig ethylene, heated to the desired temperature, and, typically, the pressure is adjusted to 950 psig.
Reaction rates (ethylene uptake rates) are determined by monitoring the time required for 50 psi pressure drops measured continuously betw~en 950 and 900 psig ethylene, assuming that ethylene behaves in the same way as an ideal gas under these reaction conditions (the reactor is repressurized to 950 psig after each rate measurement3.
Upon completion of a run, the reactor is cooled to ambient temperature or below, vented to 200 psi, and the contents are dumped into a container chilled in dry ice/acetone. The total weight of the discharged catalyst is recorded and heptane internal standard is added. The products are analyzed on a Hewlett Packard 5880 gas chromatograph with a flame ionization detector using a J&W Scientific 30 meter x 0.3 millimeter D~-l fused silica capillary column. Temperature programming is ussd at the following rate: 0 degrees C for one minute; then, a heating rate of 10 degrees C per minute to 230 degrees C; 230 degrees C
D-15,388 - 28 _ 132 9 6 B8 is maintained for 20 minutes (detector - 300 degrees C, injector - 250 degrees C).
The alpha-olefins are readily separated from the corresponding branched and internal olefins by this method. The results are calculated as total weight percent oligomer relative to the weight of the reactor contents.
The letters SI appear under certain oliyomers. SI means that there is solvent interference and, therefore, a -~eight percent cannot be obtained. When summations are made for total weight percent, the sums are low when solvent interference is reported.
Some catalysts produce oligomers beyond C22. No attempt has been made to quantify the products.
The "product make by mass balance" does not always agree with "GC total C4 to C20 (grams)"
(this refers to the total amount of C4 to C20 oligomers as determined by gas chromatographic analyses). "GC total C4 to C20 (grams)" is typically less because solvent interferes with oligomer analysis; butenes escape from the dumped catalyst prior to GC analysis; olefins greater than C20 are produced; the minireactor has a flat bottom; and solvent rinses and discharged catalysts do not always dump quantitatively.
"GC total C4 to C20 (grams)" is divided by the run time in hours and the volume of the catalyst solution charged (usually 0.035 liter) to produce the "average reaction rate to C4 to C20-calculated". This value is typically greater (often 2 to 3 times) than the "ethylene uptake rate"
D-15,388 - 29 - 13296~8 and since it is based on actual observed product, it is more accurate than the indirect ethylene uptake method. Ethylene does not appear to behave like an ideal gas at high reaction pressures, e.g., 950 psig, The structural formulae of useful ligands are set forth in Table I. The first fifteen structural formulae are each provided with a ligand number in parentheses. This num~er will be used to identify the ligand in Table II, i.e., the ligand used in each example.
Notes with respect to Table I:
Ph = phenyl i-Pr = isopropyl n-Bu = normal butyl ~ - cyclohexyl The conditions for each example are set forth in Table II and the results in Tables III and IV.
Notes with respect to Tables II, III, and IV:
1. Rates are given in gram-mole per liter per hour.
2. "OAc" is acetate.
3. "COD" is cyclooctadiene.
Technical Field This invention relates to an oligomerization process for the production of alpha-olefins and a catalyst therefor.
Backqround Art Linear alpha-olefins having 4 to 20 carbon atoms are key feedstocks in the production of surfactants, plasticizers, synthetic lubricants, and polyolefins. High purity alpha-olefins are particularly valuable in the production of low density polyethylene and in the oxo process.
The most successful processes for the production of alpha-olefins to date are those catalyzed by nickel complexes of phosphine-carboxylate ligands and sulfonated ylide/nickel type compounds. While these catalysts are quite active and have good selectivity insofar as the production of alpha-olefins is concerned, the art is continuously searching for ethylene oligomerization catalysts, which display higher activity and greater alpha-olefin selectivity and allow for a more economical process.
For example, insofar as economy is concerned, the process utilizing the nickel complexes of phosphine-carboxylate ligands requires three reaction steps: ethylene oligomerization, isomerization of C20+ product, and disproportionation of C20+ internal olefins to Cll to C14 internal olefins. The latter two steps are necessary because C20+ olefins have D--15,388 .
little co~mbrcial value. The high level of internal olefin production also raises a problem of purity important, as noted, in the production of low density polyethylene and the oxo process. Other disadvantages of these catalysts follow: the lig nds are expensive to prepare; polyethylene formation must be guarded against; the catalysts are relatively unstable; solvent is degraded; and ethylene pressure requirements are high. The sulfonated ylide/nickel type catalysts suffer from similar deficiencies.
Disclosure of Invention An object of this invention, therefore, is to provide a procPss for oligomerization to alpha-olefins, which (i) utilizes a catalyst having a higher activity than, and an improved selectivity over, its predecessor catalysts and (ii) is more economical than comparable prior art processes.
Other objects and advantages will become apparent hereinafter.
According to the present invention an economic process for the oligomerization of ethylene, or cooligomerization of ethylene and propylene, to alpha-olefins utilizing a catalyst having a substantial~y higher activity and greater selectivity than catalysts heretofore used for similar purposes has been discovered. The process comprises passing ethylene or a mixture of ethylene and propylene in contact with a catalyst, in the liquid phase, said catalyst comprising the reaction product of (i) a transition met~l compound wherein the transition metal is selected from the group D-15,388 _ 3 _ 132 96 G8 consisting of nickel, chromium, cobalt, iron, and copper, and mixtures thereof; (ii) in the event that (a) the transition metal is not in the oxidation state of zero or (b) the transition metal compound does not have a hydride or an alkyl, alkenyl, al~ynyl, or aryl group bonded to the transition metal, a catalyst activator consisting of a compound or compounds capable of transferring a hydride or an alkyl, alkenyl, alkynyl, or aryl group from itself to the transition metal/ligand (hereinafter defined) complex formed by the reaction of the transition metal compound with the ligand and bonding the group to the transition metal, said activator being present in a sufficient amount to activate the catalyst, and (iii) at least one organophosphorus sulfonate ligand containing (a) at least one benzene ring having a trivalent phosphorus atom located at one position on the benzene ring and an S03M group located at a position on the benzene ring ortho thereto, or at least one benzene ring having a trivalent phosphorus atom connected through a methylene group to a first position on the benzene ring and an S03M group connected through a methylene group to a second position on the benzene ring ortho to the first position, or at least one bridging or fused aromatic ring system having a trivalent phosphorus atom and an S03M group, each located on a different aromatic ring in the system at substituent positions adjacent to one another, or at least one aromatic ring, other than a benzene ring, or heteroaromatic ring, each ring having a triv~lent phosphorus atom and an S03M group D-15,38~
13296~8 located at substituent positions adjacent to one another, wherein M is selected from the group consisting of hydrogen, alkali metals, alkaline earth metals, and NR4 and PR4 wherein R is a hydrogen atom or a su~stituted or unsubstituted hydrocarbyl radical having 1 to 15 carbon atoms and each R can be alike or dif~erent, or (b~ a trivalent phosphorus atom connected through a group having the formula r ~
(-A-) - C y to an SO3M group _R3 whereîn A is an oxygen atom, an NH radical, or an NR
radical; R2 and R3 are hydrogen atoms or a substituted or unsubstituted hydrocarbyl radical having 1 to 6 carbon atoms and can be alike or different; x is an integer 0 or 1; y is an integer from 1 to 3; and R and M are as defined above.
Detailed DescriPtion The products of subject process are chiefly alpha-olefins of even carbon numbers. The molecular weight distribution of oligomers depends upon several reaction variables; however, the structure of the particular ligand used in the catalyst has a strong influence on the result. One catalyst, for example, produces mainly C4 to C12 alpha-olefins plus lesser and ever diminishing amounts of higher alpha-olefins resulting in a high overall selectivity to the C4 to C20 range. Other catalysts yield higher or lower molecular weight D-15,388 - 13296~8 distributions depending mainly on the size of their ligand cone angles. The cone angle is determined as described by C.A. Tolman in the Journal of the American Chemical Society, volume 92, 1970, page 2956 and in Chemical Reviews, volume 77, 1977, page 313. Cone angles are also discussed in United States patent numbers 4,169,861 and 4,201,728.
With regard to the ortho-sulfonate aspect of this invention, if one assumes that the ortho-sulfonate group exhibits about the same cone angle effect as an ortho-methyl group, then the calculated cone angles can have an average value in the range of about 120 degrees to about 200 degrees and a preferred average value in the range of about 150 degrees to about 180 degrees. Larger ligand cone angles usually give higher molecular weight distributions when the catalysts are compared under matched reaction conditions. With larger cone angle ligands, oligomer distribution usually goes beyond C20 in significant proportions. Reactivity increases with increasing cone angle up to 180 and then falls off. Other reaction parameters such as temperature, ethylene pressure, and solvent also influence oligomer distribution. Alpha content is increased by lowering reaction temperature, lowering catalyst concentration, and/or increasing ethylene pressure.
As previously noted, alpha-olefins produced by ethylene oligomerization have even carbon numbers. Subject catalysts are practically inert to propylene; however, when a mixture of ethylene and - 6 - 13296~8 propylene is present, both even and odd numbered olefins have been observed.
The catalyst is the reaction product of three components, i.e., (i) a transition metal compound (ii) a catalyst activator, and (iii) an organophosphorus sulfonate ligand.
The transition metal compound can be an organometallic compound, an organic salt, or an inorganic salt wherein the transition metal is selected from the group consisting of nickel, chromium, cobalt, iron, copper, and mixtures thereof. The transition metals are preferably in the following oxidation states: nickel - O or 2, chromium, cobalt, and iron - O, 1, 2, or 3; and copper - O, 1, or 2. Where the compound is a salt, the hydrated form is preferred. Metal salts are preferred, particularly the halides, sulfonates, benzenesulfonates, and tetrafluoroborates. Useful metal compounds are the chlorides, bromides, iodides, fluorides, hydroxides, carbonates, chlorates, ferrocyanides, sulfates, hexafluorosilicates, trifluoromethanesulfonates, nitrates, sulfides, selenides, silicides, cyanides, chromates, phenoxides, dimethyldithiocarbamates, hexafluoroacetylacetonates, molybdates, phosphates, oxides, stannates, sulfamates, thiocyanates, cyanates, titanates, tungstates, cyclopentadienides, formates, acetates, hydroxyacetates, propionates, hexanoates, oxalates, benzoates, cyclohexanebutyrates, naphthenates, citrates, dimethylglyoximes, acetylacetimides, phthalocyanines, and bis-cyclooctadienes. The D-15,388 _ 7 _ 13296~8-nickel salts, particularly those of sulfonate, tetrafluoroborate, and chloride hexahydrate, are preferred. Nickel typically gives the most active catalysts followed by chromium, copper, cobalt, and iron, in that order. Some nickel catalysts are about 50 times more reactive than chromium catalysts. On the other hand, some chromium catalysts have shown very high alpha-olefin selectivities. Mixtures of the various transition metal compounds can be used.
Specific examples of useful transition metal compounds are NiC12(anhydrous), nickel bis-cyclooctadiene, NiC12-6H20, Ni(BF4)2-6H2o ~iS04-6H20, ~iBr2-x H20, Ni(II)acetylacetonate, NiG12-dimethoxyethane, ~i(OH)2, hexamminenickel(II) chloride, nickel benzoate, nickel fluoride-4H20, nickel tosylate-6H20, nickel acetate-4H20, chromium(III) chloride-6H20, chromium(II) chloride, cupric chloride-2H20, FeC12-4H20, and cobalt(II) acetate-4H20.
The catalyst activator can be any reagent capable of activating the catalyst under oligomerization conditions. They can be selected from among the cocatalysts well known in the art of ethylene or propylene polymerization or oligomerization. Preferred catalyst activators are reagents considered to be capable of transferring a hydride or an alkyl, alkenyl, alkynyl, or aryl group from itself to the metal/ligand complex formed by the reaction of the metal salt with the ligand and bonding the group to the transition metal, said activator being present in a sufficient amount to D-15,388 - 8 ~ 1 32 9 6 ~8 activate the catalyst, Where the transition metal compound already has a hydride or an alkyl, alkenyl, alkynyl, or aryl group bonded to the transition metal and the metal is in the zero oxidation state, the catalyst activator is not required. Useful activators are borohydrides, aryl boranes, borane (BH3), mono-, di-, and trialkyl boranes, aryl borates, tri and tetra coordinate organoaluminum compounds, aluminum hydrides, tri and tetra alkyl boron compounds, organozinc compounds, and mixtures thereof. The borohydrides can be alkali metal borohydrides, quaternary ammonium borohydrides wherein the ammonium cation is R4N~, each R
being aliXe or different and selected from the group consisting of hydrogen and alkyl radicals having 1 to 10 carbon atoms; and alkali metal alkoxyborohydrides, phenoxyboro- hydrides, or amidoborohydrides wherein there are 1 to 3 alkoxy, phenoxy, or amido groups and each group has 1 to 10 carbon atoms. The aryl borane compounds can have 1 to 3 aromatic rings and the aryl borates can have 1 to 4 aromatic rings. All of the various aryl, alkyl, or alkoxy groups can be substituted or unsubstituted. Mixtures of the various boron compounds can be used. Examples are sodium borohydride, potassium borohydride, lithium borohydride, sodium trimethylborohydride, potassium tripropoxy-borohydride, tetramethylammoniumboro-hydride, triphenylborane, sodium tetraphenylborate, lithium tetraphenylborate, sodium hydrido tris(l-pyrazolyl) borate, potassium dihydro bis(l-pyrazolyl) borate, lithium D-15,3~8 - 9 - 13296~8 triethylborohydride, 1ithium tri-sec-butylborohydride, potassium tri-sec-butylborohydride, sodium cyanoborohydride, zinc borohydride, bis(triphenylphosphine) copper (I) borohydride, potassium tetraphenylborate, lithium phenyltriethylborate, lithium phenyltrimethoxyborate, sodium methoxytriphenylborate, sodium diethylaminotriphenylborate, and sodium hydroxytriphenylborate. In general, boranes derived from olefin hydroboration are suitable. These boranes can be BH3, triethylborane, dicyclohexylborane, t-hexylborane, diethylborane, ethylborane, 9-borabicyclononane [3,3,1] nonane, tricyclohexylborane, and catecholborane. Sodium tetraphenyiborate gives a more active catalyst than sodium borohydride, the difference in activity often being twofold. A mixture of triphenyl borane and sodium borohydride gives activities similar to sodium tetraphenylborate. Even though sodium tetraphenylborate gives a more active catalyst than sodium borohydride, sodium borohydride may be economically favored in some circumstances. Certain organophosphorus sulfonates do not appear to be very stable to treatment with borohydrides. Phosphonito sulfonates and phosphito sulfonates are examples.
In this case, the use of tetraphenylborate or other organo borates or organo boranes are preferred.
Examples of tri and tetra coordinate organoaluminum compounds are triethylaluminum, diisobutylaluminum hydride, diisobutylaluminum chloride, diethylaluminum cyanide, lithium D-15,388 132~6Q8 tetrabutylaluminate, sodium tetraphenylaluminate, triphenylaluminum, trimethylaluminum, trisobutylaluminum, tri-n-propylaluminum, diethylaluminum chloride, ethylaluminum dichloride, ethylaluminum sesquichloride, and methylaluminum sesquichloride. Examples of aluminum hydrides are lithium aluminum hydride, diisobutylaluminum hydride, sodium dihydrohis ~2-methoxyethoxy) aluminate, lithium diisobutylmethylaluminum hydride, sodium triethylaluminum hydride, lithium trimethoxyaluminum hydride, and potassium tri-t-buto~aluminum hydride.
The organophosphorus sulfonate ligand contains (a) at least one benzene ring having a trivalent phosphorus atom located at one position on the benzene ring and an S03M group located at a position on the benzene ring ortho thereto, or at least one benzene ring having a trivalent phosphorus atom connected through a methylene group to a first position on the benzene ring and an S03M group connected through a methylene group to a second position on the benzene ring ortho to the first position, or at least one bridging or fused aromatic ring system having a trivalent phosphorus atom and an S03M group, each located on a different aromatic ring in the system at substituent positions adjacent to one another, or at least one aromatic ring, other than a benzene ring, or heteroaromatic ring, each ring having a trivalent phosphorus atom and an S03M group located at substituent positions adjacent to one another, wherein M is selected from the group consisting of hydrogen, al~ali metals, D-15,388 alkaline earth metals, and NR4 and PR4 wherein R
is a hydrogen atom or a substituted or unsubstituted hydrocarbyl radical having 1 to 15 carbon atoms and each R can be alike or different, or (b) a trivalent phosphorus atom connected through a group having the formula (-A-)x C - y to an S03M group R3_ wherein A is an oxygen atom, an NH radical, or an NR
radical; R2 and R3 are hydrogen atoms or a substituted or unsubstituted hydrocarbyl radical having 1 to 6 carbon atoms and can be alike or different; x is an integer O or l; y is an integer from 1 to 3; and R and M are as defined above.
The phosphorus portion of the ligand can be a primary, secondary, or tertiary phosphino, phosphinito, phosphonito, phosphito, or aminophosphino group. The ligands are believed to be chelating or potentially chelating.
The organophosphorus-sulfonate is usually in the alkali metal salt form, e.g., lithium, sodium, or potassium.
Bridging ring systems are exemplified by diphenyl, the adjacent substituent positions being the ortho positions on each ring which are opposite to one another. Fused ring systems are exemplified by r.apthalene, the adjacent substituent positions being 1 and 8 and 4 and 5. Two aromatic rings that share a pair of carbon atoms are said to be fused.
Additional examples of bridging and fused ring D-15,388 - 12 13296 ~8 systems are anthracene, phenanthrene, tetralin, l-phenylnapthalene, chrysene, quinoline, isoquinoline, l,10-phenanthroline, indole, benzothiophene, acenaphthene, diphenylene, and pyrene, Typical ortho-phosphinosulfonates can be represented by the following structural formula:
R6 ~ - R5 ~ SO3M
wherein R4, R5, and R6 are hydrogen atoms or substituted or unsubstituted hydrocarbyl radicals having 1 to 20 carbon atoms, preferably 2 to 10 carbon atoms and can be alike or different; R4 and R5 can be connected to form a heterocyclic radical; and M is as set forth above.
As long as the conditions of being in ortho positions or in adjacent positions are met, the other positions on the aromatic rings can have various substituents, e.g., additional trivalent phosphorus atoms and SO3M groups and/or substituted or unsubstituted hydrocarbyl radicals having 1 to 20 carbon atoms, preferably 2 to 10 carbon atoms, and the substituents can be alike or different. Thus, the phosphorus to sulfonate ratio does not have to be one to one, but can be, for example, 2 to 1, 1 to 2, and 2 to 4. Illustrative hydrocarbyl radicals are alkyl, aryl, alkoxy, or aroxy. Other substituents can be, e.g., amino or amido groups. Examples of substituents on the rings D-15,388 - 13 - 13296G~
of the aryl and aroxy radicals are mentioned below, Sulfonated aromatics, which ca~ be converted to the organophosphorus sulfonates useful in subject invention, may be found in the Aldrich Catalog Handbook of Fine Chemicals, 1986-1987, published by Aldrich Chemical Company, Inc., Milwaukee, Wisconsin, on pages 25, 28, 82, 107, 115, 131, 132, 154, 289, 350, 593, 6S2, 6B5, 771, 969, 970, 982, 988, 1146, 1147, 1150, 1159, ll9g, 1210, 1211, 1266, 1268, and 1278 designated as 21,042-0; 21,043-9;
21,044-7; 20,183-9; 85,740-8; 21,456-6; 21,033-1;
21,057-9; 20,196-0; 20,200-2; 20,193-6; 30,198-7;
21,036-6; 20,194-4; 21,037-4; 14,644-7; A8,680-5;
10,798-0; A9,277-5; B315-9; 25,980-2; 10,814-6;
13,507-0; 19,982-6; 13,369-8; 22,845-1; 22,847-8;
28,995-7; E4,526-0; 18,381-4; H5,875-7; 27,637-5;
25,089-9; N60-5; 18,634-1; 24,954-8; 18,722-4;
27,490-9; 22,519-3; P6,480-4; 27,198-5; 85,616-9;
Q150-6; 24,307-8; 24,253-5; 11,273-9; 16,720-7;
26,146-7; 18,495-0; 25,533-5; 10,456-6; T3,592-0;
and 16,199-3. It should be noted that among the aromatics which underlie the aromatic sulfonates can be aromatics having the basic structural formula of pyridine, quinoline, and thiophene.
Typical alkylene-phosphorus sulfonates can be represented by the following structural formula:
_ _ R4 ,R2 R ~ P ~ (A)x ~ C y SO3M
- R3_ D-15,388 - 14 - 13296~
wherein R2, R3, R4, and R5 are as set forth above and can be alike or different, and A, M, x, and y are also as set forth above.
R R2 R3 R4 R5 and R6 can as noted above, be hydrogen atoms, substituted or unsubstituted hydrocarbyl radicals, and alike or different They can be alkyl, aryl, alkoxy, aroxy, amino, or amido radicals, or mixtures of these radicals. The radicals can be separate from one another or cojoined.
Examples of substituents, which can be present on the rings of the aryl and aroxy radicals follow: bromo, chloro, fluoro, trifluoromethyl, iodo, lithio, alkyl, aryl, fused aryl, alkoxy, aroxy, cyano, nitro, hydroxy, amino, amido, ammonium, formyl, acyl, acetoxy, carbonyloxy, oxycarbonyl, phenylcyclohexyl, phenylbutenyl, tolyl, xylyl, para-ethylphenyl, pentafluorophenyl, phenoxy, hydroxymethyl, thio, sulfonato, sulfonyl, sulfinyl, s~lyl, phosphino, phosphinito, phosphonito, phosphito, phosphinato, phosphonato, sulfonamido, boro, borato, borinato, boronato, sulfinato, phosphonium, sulfonium, arsonato, and arsino.
The substituents can be ortho, meta, or para to the phosphorus atom. Up to five substituents can be present on each ring subject to the limitation on the number of carbons recited in the above generic formula. Subject to the same limitation, the aryl or aroxy radicals can be benzenoid, polyaromatic, heteroaromatic, or metal sandwiches, e.g., phenyl, thienyl, pyrryl, furyl, benzyl, pyridyl, phosphorinyl, imidizyl, naphthyl, D-15,3~8 anthracyl, phenanthryl, ferrocenyl, nickelocenyl, and chromocenyl.
Examples of alkyl and alkoxy radicals are as follows: methyl, diphenylphosphinomethyl, trifluoromethyl, ethyl, 2-cyanoethyl, 2-mercaptoethyl, 2-chloroethyl, 2-diphenylphosphinoethyl, 2-trimethylsilylethyl, 2-sulfonatoethyl, l-propyl, 3-aminopropyl, 3-diphenylphosphinopropyl, 3-sulfonatopropyl, l-butyl, l-pentyl, l-hexyl, l-heptyl, l-octyl, l-nonyl, l-decyl~ t-butyl, 1,1-dimethyl-2-phenylethyl, l,l-dimethylpropyl, 1,1,2-trimethylpropyl, l,l-dimethylbutyl, l,l-diethylpropyl, tricyclohexylmethyl, l-adamantyl, cyclopropyl, cyclobutyl, 4-heptyl, cyclopentyl, cyclopropyl, methylcyclopentyl, cyclohexyl, methylcyclohexyl, cycloheptyl, cyclooctyl, cyclododecyl, exo-norbornyl, endo-norbornyl, 2-bicyclo[2.2.2] octyl, 2-adamantyl, 2-propylheptyl, isobutyl, nopinyl, decahydronaphthyl, menthyl, neomenthyl, 2-ethylhexyl, neopentyl, isopropyl, l-phenyl-2-propyl, 2-butyl, 2-pentyl, 3-pentyl, 2-hexyl, 3-hexyl, 2-heptyl, 3-heptyl, 4-heptyl, 2-octyl, 3-nonyl, and 5-decyl.
Examples of amino and amido groups follow:
N,N-diethylamino, N,N-diphenylamino, N,N-dimethylamino, N,N-diisopropylamino, ethylamino, pyrryl, t-butylamino, anilino, succinamido, acetamido, and phthalimido.
A can be as described above; and M can be an alkali metal, an-alkaline earth metal, an ammonium or phosphonium ion, or hydrogen.
D-15,388 - 16 - 13296~8 Examples of useful ligands will be ound in Table I.
Synthesis of ortho-phosphinosulfonates is accomplished by using the known reaction of a lithium benzenesulfonate with n-butyllithium to make ortho-lithiated lithium benzenesulfonate.
Subsequent reaction with an organophosphorus halide gives the lithium salt of an ortho-organophoshorus sulfonate. These compounds can be converted to other salts by exchange reactions.
The synthesis of alkylene-phosphinosulfonates can be achieved, for example, by phosphide reaction on the sodium salt of 2-chloroethanesulfonic acid.
The molar ratio of metal salt to organophosphorus sulfonate is in the range of about ~.5 to one to about 5 to one and preferably in the range of about 0.5 to one to about 2.5 to one. The optimum ratio is considered to be about 2 to one.
The catalyst is active at lower ratios; however, alpha-olefin selectivity is somewhat lower. By using two equivalents of phosphinosulfonate per nickel in aqueous solution, for example, the catalyst partitions in the aqueous phase. In this instance, it is believed that one phosphinosulfonate serves as a catalyst and the other serves as a solubilizing agent for the catalyst.
A sufficient an.ount of catalyst activator is incorporated into the complex to activate the catalyst. In some cases, the catalyst activator ~akes on the role of redox reagent, reducing or oxidizing the transition metal to an active D-15,388 - 17 - 13296~8 oxidation state. Optimum amounts of catalyst activator in any particular system are determined by experimentation. The molar ratio of catalyst activator to metal salt is typically in the range of zero to about 5 to one and is preferably in the range of about 0.1 to one to about 3 to one. It is found that borohydride to nickel salt ratios of less than or equal to one to one give a very active catalyst in sulfolane when the nickel to ligand ratio is two. Ratios for this system ranging from 0.125 to one to one to one are most active with 0.25 to one being optimum. The ratio is also a function of the solvent used and the oxidation state of the transition metal.
The liquid phase reaction can be undertaken by dissolving catalyst in a solvent or suspending the catalyst in a liquid medium. The solvent or liquid medium should be inert to process components and apparatus under process conditions. Examples of solvents are ethanol, methanol, water, toluene, sulfolane, ethylene glycol, 1,4-butanediol, ethylene carbonate, and mixtures of the foregoing. Solvents which permit phase separation from oligomer product are preerred because product can then be isolated by decantation. Other methods of product separation such as distillation m~y require temperatures, which would be harmful to the catalyst. Examples of solvents which permit phase separation are sulfolane, water, ethylene glycol, and 1,4-butanediol. It is noted that water shifts oligomer distribution to lower molecular weights.
Some of the solvents, especially alcohols and diols, D-15,388 - 18 - 13296~8 degrade with time under process conditions. Other suitable solvents can be found in United States patents 3,676,475 and 3,737,475.
One preferred solvent for ethylene oligomerization is water. Several advantages can be realized by water-soluble/oligomer insoluble catalysts: easy processing of product by substantially complete separation of catalyst from oligomers; increased alpha-olefin selectivity by minimizing olefin isomerization caused by catalyst/oligomer contact; ability to curtail oligomer chain length; and reduction of the problem of solvent degradation.
The most preferred solvent for ethylene olisomerization is sulfolane in which the catalyst is soluble, but the oligomer is not. The advantages of sulfolane follow: good partitioning of the organophosphorus sulfonate in the sulfolane phase;
very high catalyst activity/productivity using appropriate generation ratios; good separation of catalyst from oligomers; increased alpha-olefin selectivity by minimizing olefin isomerization caused by catalyst/oligomer contact; lower catalyst usage and concentrations; lower catalyst activator usage; and reduction of the problem of solvent degradation. It should be noted that the sulfolane employed in the process can contain water and other impu!ities as long as catalyst activity is not impaired. Even when water content is sufficient to completely hydrolyze the more hydrolytically unstable catalyst activators, catalyst activit`y has been observed.
~-15,388 ..~
13296~8 -- 19 -- .
Nickel complexes of ortho-diphenyl-phosphino para-toluenesulfonate, ortho-diphenyl-phosphino-benzenesulfonate, and ortho-dicyclohexyl-phosphino-para-toluenesulfonate, when suspended in water or dissolved in water/ethanol cosolvent give oligomerization catalysts having good activity.
These catalysts do not selectively partition in the asueous phase, however, unless the iigand is present in excess over the nickel.
Optimum reaction conditions can be quite different for different ligand structures. For example, the more alkyl-phosphorus substituents in the phosphinosulfonate, the more stable the catalyst is at higher reaction temperatures. In some cases, the catalysts are more active and, therefore, lower concentrations of the catalyst are called for.
The oligomerization or cooligomerization process can be run at a temperature in the range of absut 0 degrees C to about 200 degrees C. Preferred temperatures are in the range of about 30C to about 140C. It is suggested that a commercial unit be run in the range of about 60C to about 130C.
Subject process can be run at pressures in the range of about atmospheric pressure to about 5000 psig. Preferred pressures are in the range of about 400 psig to about 2000 psig. These pressures are the pressures at which the ethylene or ethylene/propylene feed is introduced into the reactor, and at which the reactor is maintained.
Pressure influences the performance of the catalyst. Experiments with ortho-diphenylphosphino-para-toluene-sulfonate/nickel catalyst are conducted ~-15,388 at 70 degrees C and pressures of 950 psig,. 500 psig, and 200 psig in an ethanol solvent. At 200 psig, the olefin product is essentially limited to up to C12 and alpha-olefin selectivities range from 25 to 78 percent by weight. At 500 psig, olefin product is essentially limited to no more than C16, but alpha-olefin selectivities are only slightly lower than 950 psig. In contrast, experiments run in sulfolane are less responsive to changes in ethylene pressur0 and tend to produce higher molecular weight oligomer distribution.
Typical catalyst concentrations are in the range of about 10 ppm (parts per millYon) to about 1000 ppm of transition metal. The ppm is based on a million parts by weight of transition metal. Some of the more active catalysts give very high reaction rates at 40 ppm, however. A preferred range is about 0.1 ppm to about 1000 ppm (about 0.000002 mole per liter to about 0.02 mole per liter).
At high reaction rates, the reactions can be ethylene mass-transfer rate limited. At lower catalyst concentrations (100 ppm versus lOOo ppm ~i), the catalyst turnover freguency, which is defined as moles of ethylene per moles of transition metal per hour or gram ethylene per gram transition metal per hour, increases. Catalyst turnover frequency can be very high in sulfolane.
A typical catalyst activation follows:
ligand, metal salt, and a tetraphenylborate catalyst activator are dissolved in a solvent and heated to reaction temperature prior to the introduction of ethylene. Unlike borohydrides, tetraphenylborate D-15,388 - 21 - 13296~8 can be mixed with ligand and metal salt in the absence of ethylene without harming the catalyst significantly. With borohydride activator, a solution of ligand and metal salt is typically placed under 100 psig ethylene at about O to SO
degrees C and a solution of ~orohydride introduced.
Higher ethylene pressures would be better for catalyst generation. Preferred ethylene pressure is in the range of about atmospheric to about 500 psig. The catalyst generation temperature is in the range of about O degrees C and about 50 degrees C.
When mixtures of triphenylborane and borohydride are used as the activator, the triphenylborane can be added to the solution prior to or during the treatment with ethylene and borohydride at conditions within the same ranges. Triphenylborane enhances the activity of the catalyst while favoring the production of lighter alpha-olefins. The activity of a tetraphenylborate-based catalyst is higher than sodium borohydride/ethylene-based catalyst.
Subject catalysts are found to be very active. For example, a sodium salt of ortho-diphenylphosphino-para-toluenesulfonic acid~nickel chloride hexahydrate/sodium borohydride based catalyst gives good activity at ambient temperature. At 30 degrees C, 950 psi ethylene, and 1000 ppm nickel salt, a reaction rate of 0.5 gram-mole per liter per hour is noted. The products produced are about 96 to 99 percent by weight alpha-olefins in the Cg to C12 range. At higher temperatures, reaction rates are greater. In D-15,388 - 22 - 132~6~8 several tests, a minireactor is filled with oligomers within 0.5 to 2 hours. The discharged catalyst solutions contain 50 to 60 percent by weight of C4 to C20 oligomers and possess volumes close to 80 to 100 milliliters, the volume of the minireactor being 100 milliliters. Ethylene uptake slows as the reactor fills. Rates of over 15 gram-mole per liter per hour are often noted.
To determine catalyst stability, the reaction is monitored at low nickel concentrations (lOC ppm Ni versus 1000 ppm Ni). Catalyst stability for the ortho-diphenylphosphino-para-toluene sulfonic acid based catalysts appears good at or below 80 degrees C based on constant ethylene gas uptake.
In experiments with orthodiphenyl-phosphino-para-toluenesulfonic acid based catalysts, polyethylene formation is not observed when the reaction is conducted at temperatures even as low as ambient.
The lithium salt of ortho-diphenylphosphino-benzenesulfonic acid shows similar catalytic properties to the sodium salt of ortho-diphenylphosphino-para-toluenesulfonic acid.
Ligand cone angles, as noted, and phosphorus basicities influence catalyst properties. The sodium salt of ortho-dicyclohexyl-phosphino-p-toluenesulfonic acid gives a very active catalyst with nickel producing both ethylene oligomers and very low molecular weight polyethylene. Initial ethylene uptake rates with this ligand (1000 ppm Ni) are 190 gram-moles per D-15,388 .
liter per hour, Selectivity to granular polyethylene having an average molecular weight of about 900 is higher at 100 degrees C, while olefin oligomers form more readily at 130 degrees C. The ligand, being a dialkylarylphosphi.ne, shows better stability at these elevated temperatures than triarylphosphine analogs. In contrast, the sodium salt of ortho-di-tert-butyl-phosphino-para-toluenesulfonic acid possesses lower activity, which suggests that the catalyst has a sharp response to ligand cone angle: the cone angle of the tert-butyl analog being slightly larger than the cyclohexyl analog. The large cone angle of ortho-dicyclohexylphosphino-para-toluenesulfonate appears to facilitate low molecular weight polyethylene formation. The phosphorus basicity of this ligand may also influence both the activity and selectivity of the catalyst.
When triphenylphosphine is added as an auxiliary ligand to an ortho-diphenylphosphino-para-toluenesulfonate/nickel catalyst, oligomer chain length is essentially curtailed to C8 and alpha-olefin selectivity to undPr 50 percent, but polyethylene formation is not observed.
It will be understood by those skilled in the art that the operator of the process will have to make selections between the organo phosphorus sulfonate ligands, the transition metal compounds, the catalyst activators, concentrations, solvents, and reaction parameters in order to obtain the level of productivity sought.
D-15,388 ~` 132960~
In the event that the catalyst is discharged from the reactor while it is still active and recharged at a later time, activity is typically lost. If catalyst to be recharged is treated with additional catalyst activator, activity is restored. Preferably, treatment with transition metal compound and catalyst activator is used to restore activity.
The invention is illustrated by the following e~amples.
Examples 1 to 55 Synthesis of the sodium salt of 2-diphenylphosphino-4-methylbenzenesulfonic acid:
Lithium-para-toluenesulfonate is prepared first. A solution of para-toluenesulfonic acid monohydrate (190 grams, 1.0 mole) in 400 milliliters of absolute ethanol is treated with lithium hydroxide monohydrate (42 grams, 1;0 mole). After stirring for one hour, the insolubles are filtered and the filtrate is concentrated to a white solid.
The filtrate is treated with 400 milliliters of toluene and the resultant heterogeneous mixture is fitted with a condenser and refluxed for 8 hours (41 milliliters of water is azeotropically removed).
The cooled mixture is filtered and the collected solids are pulverized and dried under vacuum (dry weight 163.5 grams).
The lithium salt of 2-diphenylphosphino-4-methylbenzenesulfonic acid is then prepared and converted to the sodium salt: lithium para-toluenesulfonate (8.9 grams, 50 millimoles) is suspended in 100 milliliters of dry tetrahydrofuran D-15,388 under a nitrogen atmosphere. The resultant suspension is cooled to 0 degrees C and a sollltion of n-butyllithium in hexane (34 milliliters, 1.6 molar, 55 millimoles) is added at a dropwise rate creating an orange suspension. Thirty minutes later, diphenylchlorophosphine (11.3 grams, 51 millimoles) is added at a dropwise rate, which maintains the reaction temperature between 0 and 10 degrees C resulting in a red reaction mixture. The reaction mixture is stripped of solvents to give a solid residue, treated with 200 milliliters of distilled water to give a turbid solution, and subsequently treated with 100 milliliters of saturated sodium chloride to precipitate the sodium salt. The resultant precipitate is washed twice with ether and dried under high vacuum to a powder (12.81 gram).
Other phosphino-sulfonates can be prepared in the same manner by employing different lithium aromatic sulfonates and/or organophosphorus halides. One can stop at the lithium phosphino-sulfonate stage rather than converting it to the sodium salt. Lithium phosphino-sulfonates can be used as ligands without any formal purification other than stripping the reaction solvent. Treating the salts with strong acids can precipitate the "acid form" of the ligand. Reacting the "acid form"
of the ligand with an appropriate metal hydroxide will, in turn, give metal phosphino-sulfonates useful as ligands.
Alkylenephosphino-sulfonates are prepared by the reaction of phosphides with D-15,388 13296~
haloalkanesulfonate salts. The lithium salt of 2-dicyclohexylphosphinoethanesulfonic acid is synthesized as follows: to a solution of dicyclohexylphosphine (10.6 grams, 53.4 miilimoles) in dry tetrahydrofuran (lOo milliliters) under a nitrogen atmosphere and cooled to minus ~0 degrees C
is added n-butyllithium in hexane (1.6 molar, 31.25 milliliters, 50 millimoles). The resultant yellow mixture is allowed to warm to ambient temperature and the anhydrous sodium salt of 2-chloroethanesulfonic acid (9.25 grams, 55.5 millimoles) is added in 1 to 2 gram portions while the temperature is controlled between ambient and 41 degrees C. The resultant cloudy white solution is stripped of its solvent to give an off-white solid (18.3 grams).
The oligomerization of ethylene is carried out in a minireactor having a volume of 100 milliliters. The ethylene used is CP grade ethylene containing about 99.5 percent by weight ethylene.
All solvents used in the minireactor are either distilled under nitrogen or thoroughly sparged with nitrogen prior to use.
In examples using nickel bis(l,5-cyclooctadiene), (written as Ni(COD)2), a mixture of the solid nickel bis(l,5-cyclooctadiene) and ligand (1:1 mole ratio) is treated with the desired solvent (35 milliliters~ and introduced into the minireactor within a matter of minutes. The minireactor is pressurized with 600 psig ethylene, h~ated to the desired temperature and, typically, the pressure is adjusted to 950 psig. it is found that aging of catalyst solutions for even a few D-15,388 hours prior to use resulted in lower catalytic activity.
In examples using nickel (II) chloride hexahydrate (or other metal salts), the ligand and nickel chloride mixture is treated with the solvent (35 milliliters) charged to the minireactor, and placed under 100 psig ethylene. A 0.5 molar solution of sodium borohydride in diglyme is introduced by pressure lock syringe at ambien~
t0mperature. The reactor is quickly pressurized to 600 psig ethylene, heated to the desired temperature, and, typically, the pressure is adjusted to 950 psig.
Reaction rates (ethylene uptake rates) are determined by monitoring the time required for 50 psi pressure drops measured continuously betw~en 950 and 900 psig ethylene, assuming that ethylene behaves in the same way as an ideal gas under these reaction conditions (the reactor is repressurized to 950 psig after each rate measurement3.
Upon completion of a run, the reactor is cooled to ambient temperature or below, vented to 200 psi, and the contents are dumped into a container chilled in dry ice/acetone. The total weight of the discharged catalyst is recorded and heptane internal standard is added. The products are analyzed on a Hewlett Packard 5880 gas chromatograph with a flame ionization detector using a J&W Scientific 30 meter x 0.3 millimeter D~-l fused silica capillary column. Temperature programming is ussd at the following rate: 0 degrees C for one minute; then, a heating rate of 10 degrees C per minute to 230 degrees C; 230 degrees C
D-15,388 - 28 _ 132 9 6 B8 is maintained for 20 minutes (detector - 300 degrees C, injector - 250 degrees C).
The alpha-olefins are readily separated from the corresponding branched and internal olefins by this method. The results are calculated as total weight percent oligomer relative to the weight of the reactor contents.
The letters SI appear under certain oliyomers. SI means that there is solvent interference and, therefore, a -~eight percent cannot be obtained. When summations are made for total weight percent, the sums are low when solvent interference is reported.
Some catalysts produce oligomers beyond C22. No attempt has been made to quantify the products.
The "product make by mass balance" does not always agree with "GC total C4 to C20 (grams)"
(this refers to the total amount of C4 to C20 oligomers as determined by gas chromatographic analyses). "GC total C4 to C20 (grams)" is typically less because solvent interferes with oligomer analysis; butenes escape from the dumped catalyst prior to GC analysis; olefins greater than C20 are produced; the minireactor has a flat bottom; and solvent rinses and discharged catalysts do not always dump quantitatively.
"GC total C4 to C20 (grams)" is divided by the run time in hours and the volume of the catalyst solution charged (usually 0.035 liter) to produce the "average reaction rate to C4 to C20-calculated". This value is typically greater (often 2 to 3 times) than the "ethylene uptake rate"
D-15,388 - 29 - 13296~8 and since it is based on actual observed product, it is more accurate than the indirect ethylene uptake method. Ethylene does not appear to behave like an ideal gas at high reaction pressures, e.g., 950 psig, The structural formulae of useful ligands are set forth in Table I. The first fifteen structural formulae are each provided with a ligand number in parentheses. This num~er will be used to identify the ligand in Table II, i.e., the ligand used in each example.
Notes with respect to Table I:
Ph = phenyl i-Pr = isopropyl n-Bu = normal butyl ~ - cyclohexyl The conditions for each example are set forth in Table II and the results in Tables III and IV.
Notes with respect to Tables II, III, and IV:
1. Rates are given in gram-mole per liter per hour.
2. "OAc" is acetate.
3. "COD" is cyclooctadiene.
4. "GC" is gas chromatography. It is used to measure the amounts of the olefin products.
5. Parenthetical expressions in Table III
are percentages by weight of normal alpha-olefin based on the total olefin product noted at the left of the parenthetical expression.
are percentages by weight of normal alpha-olefin based on the total olefin product noted at the left of the parenthetical expression.
6. In examples 1 to 9, 0.10 millimoles of NaBH4 in diglyme is added at 100 psig ethylene and 25C.
D-15,388 _ 30 _ 1 3 2 9 6 ~ 8 7. In examples 10 to 15, 0.065 millimoles of NaBH4 is added at 100 psig ethylene and 25C.
D-15,388 _ 30 _ 1 3 2 9 6 ~ 8 7. In examples 10 to 15, 0.065 millimoles of NaBH4 is added at 100 psig ethylene and 25C.
8. In examples 16 to 18, l.S moles of catalyst activator NaBH4 is added per mole of nickel compound.
9. In examples 19 to 25, NaBH4 is added as a 0.5 molar solution in diglyme to the other catalyst components under 100 psig ethylene.
10. In examples 21, 22, 23, and 24, the exotherm is, respectively, 134.4C, 179,7C, 142.4C, and 89.0C and the ratio of BH4/Ni++, 1:1, 1:2, 1:4, and 1:8. Examples having a BH4/Ni+~ ratio between 1:1 and 1:8 result in extremely active catalysts. ~fter injecting the sodium borohydride/diglyme solution into the reactor at around 35C and 100 psig ethylene, the reactor is further pressurized to about 750 psig and in examples 21 and 22, the reactor is heated. In examples 23 and 24 the reactor is not heated and the exotherm still occurs. As the reaction temperature approaches 60C, the reaction rate shoots up resulting in a strong exotherm and very rapid ethylene pressure drop. The above temperatures are the maximum temperature of the reaction before cold air cooling of the minireactor catches the exotherm. These exotherms appear to be detrimental to catalyst stability/productivity and alpha-olefin selectivity, but the catalyst activity is very high.
11. I~ examples 26 to 32, the ligand~nickel molar ratio is 1 and the N~BH4/
nickel molar ratio is 1.5.
D-15,388 _ 31 ~ 1 3 2 9 6 ~8 12. In example 33, the LiBH4 is in the form of a 2.0 molar solution in tetrahydrofuran.
nickel molar ratio is 1.5.
D-15,388 _ 31 ~ 1 3 2 9 6 ~8 12. In example 33, the LiBH4 is in the form of a 2.0 molar solution in tetrahydrofuran.
13. In example 35, the NaBPh4 is added to the catalyst solution prior to charging to the minireactor.
14. In examples 57 and 58, there is an exotherm to 145C and 136.3C, respectively. See Note 10 above.
15. In example 67, the Et3B/hexane solution (25%) is added to the catalyst solution prior to charging to the minireactor.
16. In example 68, the Et3Al/hexane solution (l.OM) is added to the catalyst solution under 100 psig ethylene.
17. In example 69, the [Ph3P32Cu(I)BH4 is added to the catalyst solution prior to charging to the minireactor.
18. In example 70, the BH3/tetrahydrofuran (l.OM) solution is added to the catalyst solution under 100 psig ethylene.
19. In example 71, the LiAlH4/tetrahydrofuran (l.OM) solution is added to the catalyst solution under 100 psig ethylene.
20. In example 72, the i-Bu2AlH/hexane ~l.OM) solution is added to the catalyst solution under 100 psig ethylene.
D-15,388 ~ - 32 - 13296~8 TABLE I
1 igand # 1 igand $o3N
( 1 ) ~PPh2 ( 2 ) ~Pph2 (3) ¢~lv' ( 4 ) ~ p (I-Pr)2 5 ) ~,p (CH3 ) 2 ( 6 ) 503Li ~ph ¢~ ~tBU
D-l 5, 388 _ 33 _ 1329608 TA~LE I (continued) ligand # ligand [(~ P CH2 CH2 S03 ~-3 ( 9 ~Ph2 P CH2CH2 S03 ( 10 )~1 /Pn ( 11 ) ~o ~
~H3 ~12) [~PPh;¦
Note: ligand #10 is the same as ligand #3.
D-1~,388 _ 34 - 13 2 9 6 ~ g TA~I.E I ( cont inued ) ;igand # ligand 1-~3U
( 13 )CH ~ 50 3 ~
,, CH2 P~
CH3~0 --~H3 I-Bu ( 14 ) ~ Ip/Ph PPr (15) ( 163S03LI ph2p S03LI
~ ond/or ( 1 7 ) ¢~ P Ph 2 D-15,388 _ 35 _ 1 3 2 9 6 ~8 TABLE I ( cont inued ) 1 i gand # 1 igand ( 18 ) ~CpHph )24 N]
( 19 ) S03Li ~PE~ 2 ~ .
1-8u ( 20 ) CH3~0\ ~?N
CH2 P--OCHS03 Ll ~t-B-( 21 ) S2 N(CH3)LI
~PPh2 ( 22 ) ~BU~ ~Ph S03LI /~Bu ~ ond/or ~ \Ph D-15, 388 - 36 - 132960~
(23 ) ~1PE~2 ond/or ~LI
(24) so3LI
~P(l~Bu)2 . ~
An example of a bridging aromatic ring system having a trivalent phosphorous atom and an S03M group, each located on a different aromatic ring in the system at substituent positions adjacent to one another follows: ~B ,Ph S03Ll U~p An example of a fused aromatic ring system having a trivalent phosphorous atom and an S03M
group, each located on a different aromatic ring in the system at substituent positions adjacent to one another follows:
ph2p S03LI
An example of an aromatic compound having a trivalent phosphorus atom connected through a methylene group to a first position on a benzene ring and an S03M group connected through a - methylene group to a second position on the benzene ring ortho to the first position:
,~ CH2S3LI
D-15,388 ~ CH2PPh2 Examples of an aromatic ring compound, other than a benzene ring compound, and a heteroaromatic ring compound where the rings have a trivalent phosphorus atom and an S03M group located at substituent positions adjacent to one another on the ring:
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t`'l 1~
"~ Ei c o . _ ~a o ~ _ o 4~ Ooo._o._ooo_ooo ~ Cl E O _ 1- o 1329608 o o o o ô
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13296~8 TABLE IV
Average React; on GC Total Catalyst GC Total Product Make Rate to Ca t~ C20 C4 to Czo Dump Weight C4 to C20 by Mass Balance Run Time - Calculated wt. %) (grams) (grams) (grams) (hours) (gram-mo1/L/hr) -- _ _ _ __ 2 ---- __ 3 ~
4 _ __ __ S -- __ 6-- -- _ __ -- -- -- -- ----lZ
13 -- -- _ _ _ __ 14 -- -- _ _ _ __ 16 25.53 71.9 18.36 1.6 11.7 17 6.Z849.0~ 3.û8 1.1 2.86 18 8.4349.71 4.19 1.4 3.05 19 5.9153.5 3.16 10.39 1.2 2.84 25.53 71.9 18.36 24.9032 1.6 11.7 D-1 5 , 388 13~96~8 TABLE IV ( Cont inued ) .
Average Reaction GC TotalCatalystGC TotalProduct Make Rate to C4 to C20 C4 to CzûDump Weight C4 to C20 by Mass Balance Run Time - Calculated 2s~me~ (wt. ~ rams) (arams) (grams) (hours) (gram-mol/L/hr) 21 38.46 85.1 32.73 39.79 û.5 66.7 22 Z6.17 70.5 18.45 25.69 0.5 37.6 23 40.û6 84.8 33.97 38.87 0.5 69.2 24 4û .42 84.8 34.7û 38.98 û .5 7û .68 25 17.59 63.9 11.24 18.02 0.9 12.72 26 6.ûl 37.21 2.236 7.126 1.0 2.28 27 11.55 38. ûO 4.39 7.900 1.0 4. ~7 28 7.5Z 55.00 4.136 8.868 1.0 4.21 29 6.62 55.80 3.69 13.52 1.0 3.76 30 0.825 52.00 0.43 1.30 0.9 0.49 31 8.11 45.58 3.70 8.14 1.1 3.77 32 7.26 52.00 3.78 7.71 1.3 2.96 33 15.29 43.41 6.64 13.34 0.7518.12 34 41.27 51.0 23.52 27.01 0.5 55.02 3S 46.û9 71.5 32.95 41.7 0.5 67.11 36 30.56 56.0 17.11 -- 0.5 34.85 37 8.73 50.79 4.433 6.712 1.53.01 ~828.988 74.6 21.6 28.2 1.514.7 39 3.16 54.012 1.71 5.26 2.40.73 40 9.11 60.10 5.47 10.34 1.24.65 D--1~,388 TABLE IV ( ~ont inued ) Average Reacti on GC Total Catal yst GC Total Product Make Rate to C4 to C20 C4 to C2û ~ump WeightC4 to CzO by Mass Balance Run Time - Calculated 2~me~ (wt. %)Igrams) (grams) (grams) (hours) (gram-mol/Lihr) 41 0.128 52.1 0.067 6.3a 1.10.06 42 0.216 45.87 0.0990.1275 l.û û.10 43 0.271 46.4 0.1260.5151 1.20.11 44 4.513 34.021 .536Z .585 1.31.20 4530.146 53.285916.û6421.91 1.016.36 4622.945 46.96111 û .775 15.608 1.5 7.32 - 47 0.322 30.8468O.û993-0.342 0.50.20 48 3.895 32.û92 1.25 2.26 0.52.55 4922.572 76.4417.25430.536 0.535.14 50 22.12 21.3915.791 26.74 0.353.61 51 15.i6 73.0 11.5126.8113 0.429.31 52 11.76 52.80 6.21 7.348 1.25.27 53 5.619 38.û3 2.14 8.0545 0.73.11 5428.327 85.20 24.1338.931 1.024.58 55 2.602 47.0 1.223 3.1û 1.01.25 5635.164 79.0 27.78 33.52 0.470.7 5729.587 73.4 21.72 28.81 0.544.2 5828.966 75.2 21.78 30.22 0.544.2 5939.156 68.2 26.70 22.70 1.124.7 60 1.052 49.0 0.52 3.80 2.5 û.2 D-15, 388 13296~8 TABLE IV ( Cont inued Average React i on GC TotalCatal yst GC Total Product Make Rate to C4 to C20 C4 to CzO Oump Weight C4 to Czo by Mass Balance Run Time - Calculated ~2~ (wt, ~'~) (grams) (grams) (grams) ~hours) (gram-mol/l./hr) 6121.Z9466.0 14.0520.59 0.5 28.62 621.66347.8 0.7952.1 0.751.08 6335.30977. û 27.1932.0 0.3383.9 6435.19481.0 28.5135.39 0.4 72.6 6511.02558.7 6.4712.9 1.0 6.69 660.77'52.7 0.0417.22 1.0 û .042 6753.02777.7 41.2031.4 1.3 32.28 6834.74875.8 26.3430.3 1.0 26.8 6920.28864.3 13.0518.8 1.013.3 7029.41967.2 19.7722.2 0.6 33.56 7126.41355.2 14.5810.6 1.014.85 7224.7871.8 17.8126.8 1.018.14 D--15, 388
D-15,388 ~ - 32 - 13296~8 TABLE I
1 igand # 1 igand $o3N
( 1 ) ~PPh2 ( 2 ) ~Pph2 (3) ¢~lv' ( 4 ) ~ p (I-Pr)2 5 ) ~,p (CH3 ) 2 ( 6 ) 503Li ~ph ¢~ ~tBU
D-l 5, 388 _ 33 _ 1329608 TA~LE I (continued) ligand # ligand [(~ P CH2 CH2 S03 ~-3 ( 9 ~Ph2 P CH2CH2 S03 ( 10 )~1 /Pn ( 11 ) ~o ~
~H3 ~12) [~PPh;¦
Note: ligand #10 is the same as ligand #3.
D-1~,388 _ 34 - 13 2 9 6 ~ g TA~I.E I ( cont inued ) ;igand # ligand 1-~3U
( 13 )CH ~ 50 3 ~
,, CH2 P~
CH3~0 --~H3 I-Bu ( 14 ) ~ Ip/Ph PPr (15) ( 163S03LI ph2p S03LI
~ ond/or ( 1 7 ) ¢~ P Ph 2 D-15,388 _ 35 _ 1 3 2 9 6 ~8 TABLE I ( cont inued ) 1 i gand # 1 igand ( 18 ) ~CpHph )24 N]
( 19 ) S03Li ~PE~ 2 ~ .
1-8u ( 20 ) CH3~0\ ~?N
CH2 P--OCHS03 Ll ~t-B-( 21 ) S2 N(CH3)LI
~PPh2 ( 22 ) ~BU~ ~Ph S03LI /~Bu ~ ond/or ~ \Ph D-15, 388 - 36 - 132960~
(23 ) ~1PE~2 ond/or ~LI
(24) so3LI
~P(l~Bu)2 . ~
An example of a bridging aromatic ring system having a trivalent phosphorous atom and an S03M group, each located on a different aromatic ring in the system at substituent positions adjacent to one another follows: ~B ,Ph S03Ll U~p An example of a fused aromatic ring system having a trivalent phosphorous atom and an S03M
group, each located on a different aromatic ring in the system at substituent positions adjacent to one another follows:
ph2p S03LI
An example of an aromatic compound having a trivalent phosphorus atom connected through a methylene group to a first position on a benzene ring and an S03M group connected through a - methylene group to a second position on the benzene ring ortho to the first position:
,~ CH2S3LI
D-15,388 ~ CH2PPh2 Examples of an aromatic ring compound, other than a benzene ring compound, and a heteroaromatic ring compound where the rings have a trivalent phosphorus atom and an S03M group located at substituent positions adjacent to one another on the ring:
PPh2 ~SO 3 Ll PPh2 SO 3 Ll so 3 Ll ,. ~PPh2 D-15,388 38- 1 3296Clg = Y a _ ~
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13296~8 TABLE IV
Average React; on GC Total Catalyst GC Total Product Make Rate to Ca t~ C20 C4 to Czo Dump Weight C4 to C20 by Mass Balance Run Time - Calculated wt. %) (grams) (grams) (grams) (hours) (gram-mo1/L/hr) -- _ _ _ __ 2 ---- __ 3 ~
4 _ __ __ S -- __ 6-- -- _ __ -- -- -- -- ----lZ
13 -- -- _ _ _ __ 14 -- -- _ _ _ __ 16 25.53 71.9 18.36 1.6 11.7 17 6.Z849.0~ 3.û8 1.1 2.86 18 8.4349.71 4.19 1.4 3.05 19 5.9153.5 3.16 10.39 1.2 2.84 25.53 71.9 18.36 24.9032 1.6 11.7 D-1 5 , 388 13~96~8 TABLE IV ( Cont inued ) .
Average Reaction GC TotalCatalystGC TotalProduct Make Rate to C4 to C20 C4 to CzûDump Weight C4 to C20 by Mass Balance Run Time - Calculated 2s~me~ (wt. ~ rams) (arams) (grams) (hours) (gram-mol/L/hr) 21 38.46 85.1 32.73 39.79 û.5 66.7 22 Z6.17 70.5 18.45 25.69 0.5 37.6 23 40.û6 84.8 33.97 38.87 0.5 69.2 24 4û .42 84.8 34.7û 38.98 û .5 7û .68 25 17.59 63.9 11.24 18.02 0.9 12.72 26 6.ûl 37.21 2.236 7.126 1.0 2.28 27 11.55 38. ûO 4.39 7.900 1.0 4. ~7 28 7.5Z 55.00 4.136 8.868 1.0 4.21 29 6.62 55.80 3.69 13.52 1.0 3.76 30 0.825 52.00 0.43 1.30 0.9 0.49 31 8.11 45.58 3.70 8.14 1.1 3.77 32 7.26 52.00 3.78 7.71 1.3 2.96 33 15.29 43.41 6.64 13.34 0.7518.12 34 41.27 51.0 23.52 27.01 0.5 55.02 3S 46.û9 71.5 32.95 41.7 0.5 67.11 36 30.56 56.0 17.11 -- 0.5 34.85 37 8.73 50.79 4.433 6.712 1.53.01 ~828.988 74.6 21.6 28.2 1.514.7 39 3.16 54.012 1.71 5.26 2.40.73 40 9.11 60.10 5.47 10.34 1.24.65 D--1~,388 TABLE IV ( ~ont inued ) Average Reacti on GC Total Catal yst GC Total Product Make Rate to C4 to C20 C4 to C2û ~ump WeightC4 to CzO by Mass Balance Run Time - Calculated 2~me~ (wt. %)Igrams) (grams) (grams) (hours) (gram-mol/Lihr) 41 0.128 52.1 0.067 6.3a 1.10.06 42 0.216 45.87 0.0990.1275 l.û û.10 43 0.271 46.4 0.1260.5151 1.20.11 44 4.513 34.021 .536Z .585 1.31.20 4530.146 53.285916.û6421.91 1.016.36 4622.945 46.96111 û .775 15.608 1.5 7.32 - 47 0.322 30.8468O.û993-0.342 0.50.20 48 3.895 32.û92 1.25 2.26 0.52.55 4922.572 76.4417.25430.536 0.535.14 50 22.12 21.3915.791 26.74 0.353.61 51 15.i6 73.0 11.5126.8113 0.429.31 52 11.76 52.80 6.21 7.348 1.25.27 53 5.619 38.û3 2.14 8.0545 0.73.11 5428.327 85.20 24.1338.931 1.024.58 55 2.602 47.0 1.223 3.1û 1.01.25 5635.164 79.0 27.78 33.52 0.470.7 5729.587 73.4 21.72 28.81 0.544.2 5828.966 75.2 21.78 30.22 0.544.2 5939.156 68.2 26.70 22.70 1.124.7 60 1.052 49.0 0.52 3.80 2.5 û.2 D-15, 388 13296~8 TABLE IV ( Cont inued Average React i on GC TotalCatal yst GC Total Product Make Rate to C4 to C20 C4 to CzO Oump Weight C4 to Czo by Mass Balance Run Time - Calculated ~2~ (wt, ~'~) (grams) (grams) (grams) ~hours) (gram-mol/l./hr) 6121.Z9466.0 14.0520.59 0.5 28.62 621.66347.8 0.7952.1 0.751.08 6335.30977. û 27.1932.0 0.3383.9 6435.19481.0 28.5135.39 0.4 72.6 6511.02558.7 6.4712.9 1.0 6.69 660.77'52.7 0.0417.22 1.0 û .042 6753.02777.7 41.2031.4 1.3 32.28 6834.74875.8 26.3430.3 1.0 26.8 6920.28864.3 13.0518.8 1.013.3 7029.41967.2 19.7722.2 0.6 33.56 7126.41355.2 14.5810.6 1.014.85 7224.7871.8 17.8126.8 1.018.14 D--15, 388
Claims (59)
1. An oligomerization or cooligomerization process comprising passing ethylene or a mixture of ethylene and propylene in contact with a catalyst, in the liquid phase, said catalyst comprising the reaction product of (i) a transition metal compound wherein the transition metal is selected from the group consisting of nickel, chromium, cobalt, iron, and copper, and mixtures thereof; (ii) in the event that (a) the transition metal is not in the oxidation state of zero or (b) the transition metal compound does not have a hydride or an alkyl, alkenyl, alkynyl, or aryl group bonded to the transition metal, a catalyst activator consisting of a compound or compounds capable of transferring a hydride or an alkyl, alkenyl, alkynyl, or aryl group from itself to a transition metal/ligand complex formed by the reaction of the transition metal compound with the ligand and bonding the group to the transition metal, said activator being present in a sufficient amount to activate the catalyst; and (iii) at least one organophosphorus sulfonate ligand containing (a) at least one benzene ring having a trivalent phosphorus atom located at one position on the benzene ring and an SO3M group located at a position on the benzene ring ortho thereto, or at least one benzene ring having a trivalent phosphorus atom connected through a methylene group to a first position on the benzene ring and an SO3M group connected through a methylene group to a second position on the benzene ring ortho to the first position, or at least one bridging or fused aromatic ring system having a trivalent phosphorus atom and an SO3M group, each located on a different aromatic ring in the system at substituent positions adjacent to one another, or at least one aromatic ring, other than a benzene ring, or heteroaromatic ring, each ring having a trivalent phosphorus atom and an SO3M group located at substituent positions adjacent to one another, wherein M is selected from the group consisting of hydrogen, alkali metals, alkaline earth metals, and NR4 and PR4 wherein R
is a hydrogen atom or a hydrocarbyl radical having 1 to 15 carbon atoms and each R can be alike or different or (b) a trivalent phosphorus atom connected through a group having the formula to an SO3M group wherein A is an oxygen atom, an NH radical, or an NR
radical; R2 and R3 are hydrogen atoms or a hydrocarbyl radical having 1 to 6 carbon atoms and can be alike or different; x is an integer 0 or 1; y is an integer from 1 to 3; and R and M are as defined above.
is a hydrogen atom or a hydrocarbyl radical having 1 to 15 carbon atoms and each R can be alike or different or (b) a trivalent phosphorus atom connected through a group having the formula to an SO3M group wherein A is an oxygen atom, an NH radical, or an NR
radical; R2 and R3 are hydrogen atoms or a hydrocarbyl radical having 1 to 6 carbon atoms and can be alike or different; x is an integer 0 or 1; y is an integer from 1 to 3; and R and M are as defined above.
2. The process defined in claim 1 wherein the catalyst activator is selected from the group consisting of borohydrides, aryl boranes, BH3, mono-, di-, and trialkyl boranes, aryl borates, tri and tetra coordinate organoaluminum compounds, aluminum hydrides, tri and tetra alkyl boron compounds, organozinc compounds, and mixtures thereof.
3. The process defined in claims 1 or 2 wherein the transition metal compound is a hydrated salt.
4. The process defined in claim 3 wherein the hydrated salt is selected from the group consisting of halides, sulfonates, tetrafluoroborates, and mixtures thereof.
5. The process defined in claim 3 wherein the transition metal is nickel.
6. The process defined in claim 2 wherein the catalyst activator is a borohydride selected from the group consisting of alkali metal borohydrides, quaternary ammonium borohydrides, alkali metal alkoxyborohydrides, phenoxyborohydrides, or amidoborohydrides, and mixtures thereof.
7. The process defined in claim 2 wherein the catalyst activator is selected from the group consisting of aryl boranes, BH3, mono-, di-, and trialkyl boranes, aryl borates, and mixtures thereof.
8. The process defined in claims 1 or 2 wherein the organophosphorus sulfonate ligand is in
9. The process defined in claims 1 or 2 wherein the ligand is an ortho-phosphorus sulfonate represented by the following structural formula:
wherein R4, R5, R6 are hydrogen atoms or hydrocarbyl radicals having 1 to 20 carbon atoms and can be alike or different; R4 and R5 can be connected to form a heterocyclic radical; and M is as set forth above.
wherein R4, R5, R6 are hydrogen atoms or hydrocarbyl radicals having 1 to 20 carbon atoms and can be alike or different; R4 and R5 can be connected to form a heterocyclic radical; and M is as set forth above.
10. The process defined in claims 1 or 2 wherein the ligand is an alkylene-phosphinosulfonate represented by the following structural formula:
wherein R2, R3, A, M, x, and y are as set forth above, and R4 and R5 are hydrogen atoms or hydrocarbyl radicals having 1 to 20 carbon atoms, can be alike or different, and can be connected to form a heterocyclic radical.
wherein R2, R3, A, M, x, and y are as set forth above, and R4 and R5 are hydrogen atoms or hydrocarbyl radicals having 1 to 20 carbon atoms, can be alike or different, and can be connected to form a heterocyclic radical.
11. The process defined in claim 9 wherein R4, R5, and R6 are selected from the group consisting of hydrogen atoms or alkyl, aryl, alkoxy, aroxy, amino, or amido radicals, or mixtures thereof.
12. The process defined in claim 10 wherein R4 and R5 are selected from the group consisting of hydrogen atoms or alkyl, aryl, alkoxy, aroxy, amino, or amido radicals, or mixtures thereof.
13. The process defined in claims 1 or 2 wherein the process is carried out in water.
14. The process defined in claims 1 or 2 wherein the process is carried out in sulfolane.
15. An oligomerization catalyst precursor comprising (i) a transition metal compound wherein the transition metal is selected from the group consisting of nickel, chromium, cobalt, iron, and copper, and mixtures thereof and (ii) at least one organophosphorus sulfonate ligand containing (a) at least one benzene ring having a trivalent phosphorus atom located at one position on the benzene ring and an SO3M group located at a position on the benzene ring ortho thereto, or at least one benzene ring having a trivalent phosphorus atom connected through a methylene group to a first position on the benzene ring and an SO3M group connected through a methylene group to a second position on the benzene ring ortho to the first position, or at least one bridging or fused aromatic ring system having a trivalent phosphorus atom and an SO3M group, each located on the same or different aromatic ring in the system at substituent positions adjacent to one another, or at least one aromatic ring, other than a benzene ring, or heteroaromatic ring, each ring having a trivalent phosphorus atom and an SO3M
group located at substituent positions adjacent to one another, wherein M is selected from the group consisting of hydrogen, alkali metals, alkaline earth metals, and NR4 and PR4 wherein R is a hydrogen atom or a hydrocarbyl radical having 1 to 15 carbon atoms and each R can be alike or different or (b) a trivalent phosphorus atom connected through a group having the formula to an SO3M group wherein A is an oxygen atom, an NH radical, or an NR
radical; R2 and R3 are hydrogen atoms or a hydrocarbyl radical having 1 to 6 carbon atoms and can be alike or different; x is an integer 0 or 1; y is an integer from 1 to 3; and R and M are as defined above.
group located at substituent positions adjacent to one another, wherein M is selected from the group consisting of hydrogen, alkali metals, alkaline earth metals, and NR4 and PR4 wherein R is a hydrogen atom or a hydrocarbyl radical having 1 to 15 carbon atoms and each R can be alike or different or (b) a trivalent phosphorus atom connected through a group having the formula to an SO3M group wherein A is an oxygen atom, an NH radical, or an NR
radical; R2 and R3 are hydrogen atoms or a hydrocarbyl radical having 1 to 6 carbon atoms and can be alike or different; x is an integer 0 or 1; y is an integer from 1 to 3; and R and M are as defined above.
16. The catalyst precursor defined in claim 15 wherein the transition metal compound is a hydrated salt.
17. The catalyst precursor defined in claim 16 wherein the hydrated salt is selected from the group consisting of halides, sulfonates, tetrafluoroborates, and mixtures thereof.
18. The catalyst precursor defined in claim 16 wherein the transition metal is nickel.
19. The catalyst precursor defined in claim 15 wherein the organophosphorus-sulfonate ligand is in the alkali metal salt form.
20. The catalyst precursor defined in claim 15 wherein the ligand is an ortho-phosphorus sulfonate represented by the following structural formula:
wherein R4, R5, R6 are hydrogen atoms or hydrocarbyl radicals having 1 to 20 carbon atoms and can be alike or different; R4 and R5 can be connected to form a heterocyclic radical; and M is as set forth above.
wherein R4, R5, R6 are hydrogen atoms or hydrocarbyl radicals having 1 to 20 carbon atoms and can be alike or different; R4 and R5 can be connected to form a heterocyclic radical; and M is as set forth above.
21. The catalyst precursor defined in claim 15 wherein the ligand is an alkylene-phosphinosulfonate represented by the following structural formula:
wherein R2, R3, A, M, x, and y are as set forth above, and R4 and R5 are hydrogen atoms or hydrocarbyl radicals having 1 to 20 carbon atoms, can be alike or different, and can be connected to form a heterocyclic radical.
wherein R2, R3, A, M, x, and y are as set forth above, and R4 and R5 are hydrogen atoms or hydrocarbyl radicals having 1 to 20 carbon atoms, can be alike or different, and can be connected to form a heterocyclic radical.
22. The catalyst precursor defined in claim 20 wherein R4, R5, and R6, are selected from the group consisting of hydrogen atoms or alkyl, aryl, alkoxy, aroxy, amino, or amido radicals, or mixtures thereof.
23. The catalyst precursor defined in claim 21 wherein R4 and R5 are selected from the group consisting of hydrogen atoms or alkyl, aryl, alkoxy, aroxy, amino, or amido radicals, or mixtures thereof.
24. A reaction product of the catalyst precursor defined in claim 15 and a catalyst activator in an amount sufficient to activate the reaction product thus converting the reaction product into an oligomerization catalyst.
25. The reaction product defined in claim 24 wherein the catalyst activator is capable, under oligomerization reaction conditions, of transferring a hydride or an alkyl, alkenyl, alkynyl, or aryl group from itself to a transition metal/ligand complex formed by the reaction of the transition metal compound with the ligand and bonding the group to the transition metal.
26. The reaction product defined in claim 24 wherein the catalyst activator is selected from the group consisting of borohydrides, aryl boranes, BH3, mono-, di-, and trialkyl boranes, aryl borates, tri and tetra coordinate organoaluminum compounds, aluminum hydrides, tri and tetra alkyl boron compounds, organozinc compounds, and mixtures thereof.
27. The reaction product defined in claim 26 wherein the catalyst activator is a borohydride selected from the group consisting of alkali metal borohydrides, quaternary ammonium borohydrides, alkali metal alkoxyborohydrides, phenoxyboro-hydrides, or amidoborohydrides, and mixtures thereof.
28. The reaction product defined in claim 26 wherein the catalyst activator is selected from the group consisting of aryl boranes, aryl borates, BH3, mono-, di-, and trialkyl boranes, and mixtures thereof.
29. An oligomerization catalyst comprising the reaction product of (i) a transition metal compound wherein the transition metal is selected from the group consisting of nickel, chromium, cobalt, iron, and copper, and mixtures thereof; (ii) in the event that (a) the transition metal is not in the oxidation state of 0 or (b) the transition metal compound does not have a hydride or an alkyl, alkenyl, alkynyl, or aryl group bonded to the transition metal, a catalyst activator in sufficient amount to activate the catalyst; and (iii) at least one organophosphorus sulfonate ligand containing (a) at least one benzene ring having a trivalent phosphorus atom located at one position on the benzene ring and an SO3M group located at a position on the benzene ring ortho thereto, or at least one benzene ring having a trivalent phosphorus atom connected through a methylene group to a first position on the benzene ring and an SO3M group connected through a methylene group to a second position on the benzene ring ortho to the first position, or at least one bridging or fused aromatic ring system having a trivalent phosphorus atom and an SO3M group, each located on the same or different aromatic ring in the system at substituent positions adjacent to one another, or at least one aromatic ring, other than a benzene ring, or heteroaromatic ring, each ring having a trivalent phosphorus atom and an SO3M group located at substituent positions adjacent to one another, wherein M is selected from the group consisting of hydrogen, alkali metals, alkaline earth metals, and NR4 and PR4 wherein R is a hydrogen atom or a hydrocarbyl radical having 1 to 15 carbon atoms and each R can be alike or different or (b) a trivalent phosphorus atom connected through a group having the formula to an SO3M group wherein A is an oxygen atom, an NH radical, or an NR
radical; R2 and R3 are hydrogen atoms or a hydrocarbyl radical having 1 to 6 carbon atoms and can be alike or different; x is an integer 0 or 1; y is an integer from 1 to 3; and R and M are as defined above.
radical; R2 and R3 are hydrogen atoms or a hydrocarbyl radical having 1 to 6 carbon atoms and can be alike or different; x is an integer 0 or 1; y is an integer from 1 to 3; and R and M are as defined above.
30. The catalyst defined in claim 29 wherein the catalyst activator consists of a compound or compounds capable of transferring, under oligomerization reaction conditions, a hydride or an alkyl, alkenyl, alkynyl, or aryl group from itself to the transition metal/ligand complex formed by the reaction of the transition metal compound with the ligand and bonding the group to the transition metal.
31. The catalyst defined in claims 29 or 30 wherein the ligand contains at least one benzene ring having a trivalent phosphorus atom located at one position on the benzene ring and an SO3M group located at a position on the benzene ring ortho thereto.
32. The catalyst defined in claims 29 or 30 wherein the ligand contains at least one benzene ring having a trivalent phosphorus atoms connected through a methylene group to a first position on the benzene ring and an SO3M group connected through a methylene group to a second position on the benzene ring.
33. The catalyst defined in claims 29 or 30 wherein the ligand contains at least one bridging or fused aromatic ring system having a trivalent phosphorus atom and an SO3M group, each located on a different aromatic ring in the system at substituent positions adjacent to one another.
34. The catalyst defined in claims 29 or 30 wherein the ligand contains at least one aromatic ring, other than a benzene ring, or heteroaromatic ring, each ring having a trivalent phosphorus atom and an SO3M group located at substituent positions adjacent to one another.
35. The catalyst defined in claim 29 or 30 wherein the catalyst activator is selected from the group consisting of borohydrides, aryl boranes, BH3, mono-, di-, and trialkyl boranes, aryl borates, tri and tetra coordinate organoaluminum compounds, aluminum hydrides, tri and tetra alkyl boron compounds, organozinc compounds, and mixtures thereof.
36. The catalyst defined in claims 29 or 30 wherein the transition metal compound is a hydrated salt.
37. The catalyst defined in claim 36 wherein the hydrated salt is selected from the group consisting of halides, sulfonates, tetrafluoro-borates, and mixtures thereof.
38. The catalyst defined in claim 36 wherein the transition metal is nickel.
39. The catalyst defined in claim 35 wherein the catalyst activator is a borohydride selected from the group consisting of alkali metal borohydrides, quaternary ammonium borohydrides, alkali metal alkoxyborohydrides, phenoxyboro-hydrides, or amidoborohydrides, and mixtures thereof.
40. The catalyst defined in claim 35 wherein the catalyst activator is selected from the group consisting of aryl boranes, BH3, mono-, di-, and trialkyl boranes, aryl borates, and mixtures thereof.
41. The catalyst defined in claim 35 wherein the catalyst activator is selected from the group consisting of tri or tetra coordinate organoaluminum compounds, aluminum hydrides, tri or tetra alkyl boron compounds, and organozinc compounds.
42. The catalyst defined in claim 41 wherein the catalyst activator is triethylaluminum.
43. The catalyst defined in claims 29 or 30 wherein the organophosphorus-sulfonate ligand is in the alkali metal salt form.
44. The catalyst defined in claims 29 or 30 wherein the ligand is an ortho-phosphorus sulfonate represented by the following structural formula:
wherein R4, R5, R6 are hydrogen atoms or hydrocarbyl radicals having 1 to 20 carbon atoms and can be alike or different; R4 and R5 can be connected to form a heterocyclic radical; and M is as set forth above.
wherein R4, R5, R6 are hydrogen atoms or hydrocarbyl radicals having 1 to 20 carbon atoms and can be alike or different; R4 and R5 can be connected to form a heterocyclic radical; and M is as set forth above.
45. The catalyst defined in claims 29 or 30 wherein the ligand is an alkylene-phosphino-sulfonate represented by the following structural formula:
wherein R2, R3, A, M, x, and y are as set forth above, and R4 and R5 are hydrogen atoms or hydrocarbyl radicals having 1 to 20 carbon atoms, can be alike or different, and can be connected to form a heterocyclic radical.
wherein R2, R3, A, M, x, and y are as set forth above, and R4 and R5 are hydrogen atoms or hydrocarbyl radicals having 1 to 20 carbon atoms, can be alike or different, and can be connected to form a heterocyclic radical.
46. The catalyst defined in claim 44 wherein R4, R5, and R6 are selected from the group consisting of hydrogen atoms or alkyl, aryl, alkoxy, aroxy, amino, or amido radicals, or mixtures thereof.
47. The catalyst defined in claim 45 wherein R4 and R5 are selected from the group consisting of hydrogen atoms or alkyl, aryl, alkoxy, aroxy, amino, or amido radicals, or mixtures thereof.
48. An organophosphorus sulfonate ligand containing (a) at least one benzene ring having a trivalent phosphorus atom located at one position on the benzene ring and an SO3M group located at a position on the benzene ring ortho thereto, or at least one benzene ring having a trivalent phosphorus atom connected through a methylene group to a first position on the benzene ring and an SO3M group connected through a methylene group to a second position on the benzene ring ortho to the first position, or at least one bridging or fused aromatic ring system having a trivalent phosphorus atom and an SO3M group, each located on a different aromatic ring in the system at substituent positions adjacent to one another, or at least one aromatic ring, other than a benzene ring, or heteroaromatic ring, each ring having a trivalent phosphorus atom and an SO3M
group located at substituent positions adjacent to one another, wherein M is selected from the group consisting of hydrogen, alkali metals, alkaline earth metals, and NR4 and PR4 wherein R is a hydrogen atom or a hydrocarbyl radical having 1 to 15 carbon atoms and each R can be alike or different or (b) a trivalent phosphorus atom connected through a group having the formula to an SO3M group wherein A is an oxygen atom, an NH radical, or an NR
radical; R2 and R3 are hydrogen atoms or a hydrocarbyl radical having 1 to 6 carbon atoms and can be alike or different; x is an integer 0 or 1; y is an integer from 1 to 3; and R and M are as defined above.
group located at substituent positions adjacent to one another, wherein M is selected from the group consisting of hydrogen, alkali metals, alkaline earth metals, and NR4 and PR4 wherein R is a hydrogen atom or a hydrocarbyl radical having 1 to 15 carbon atoms and each R can be alike or different or (b) a trivalent phosphorus atom connected through a group having the formula to an SO3M group wherein A is an oxygen atom, an NH radical, or an NR
radical; R2 and R3 are hydrogen atoms or a hydrocarbyl radical having 1 to 6 carbon atoms and can be alike or different; x is an integer 0 or 1; y is an integer from 1 to 3; and R and M are as defined above.
49. The ligand defined in claim 48 wherein the ligand contains at least one benzene ring having a trivalent phosphorus atom located at one position on the benzene ring and an SO3M group located at a position on the benzene ring ortho thereto wherein M
is defined as above.
is defined as above.
50. The ligand defined in claim 48 wherein the ligand contains at least one benzene ring having a trivalent phosphorus atoms connected through a methylene group to a first position on the benzene ring and an SO3M group connected through a methylene group to a second position on the benzene ring wherein M is defined as above.
51. The ligand defined in claim 48 wherein the ligand contains at least one bridging or fused aromatic ring system having trivalent phosphorus atom and an SO3M group, each located on a different aromatic ring in the system at substituent positions adjacent to one another wherein M is defined as above.
52. The ligand defined in claim 48 wherein the ligand contains at least one aromatic ring, other than a benzene ring, or heteroaromatic ring, each ring having a trivalent phosphorus atom and an SO3M group located at substituent positions adjacent to one another wherein M is defined as above.
53. The ligand defined in claim 48 wherein the organophosphorus-sulfonate ligand is in the alkali metal salt form.
54. The ligand defined in claims 48 or 53 wherein the ligand is an ortho-phosphorus sulfonate represented by the following structural formula:
wherein R4, R5, R6 are hydrogen atoms or hydrocarbyl radicals having 1 to 20 carbon atoms and can be alike or different; R4 and R5 can be connected to form a heterocyclic radical; and M is as set forth above.
wherein R4, R5, R6 are hydrogen atoms or hydrocarbyl radicals having 1 to 20 carbon atoms and can be alike or different; R4 and R5 can be connected to form a heterocyclic radical; and M is as set forth above.
55. The ligand defined in claim 54 wherein R4, R5, and R6 are selected from the group consisting of hydrogen atoms or alkyl, aryl, alkoxy, aroxy, amino, or amido radicals, or mixtures thereof.
56. The ligand defined in claims 48 or 53 wherein the ligand is an alkylene-phosphino-sulfonate represented by the following structural formula:
wherein R2, R3, A, M, x, and y are as set forth above, and R4 and R5 are hydrogen atoms or hydrocarbyl radicals having 1 to 20 carbon atoms, can be alike or different, and can be connected to form a heterocyclic radical.
wherein R2, R3, A, M, x, and y are as set forth above, and R4 and R5 are hydrogen atoms or hydrocarbyl radicals having 1 to 20 carbon atoms, can be alike or different, and can be connected to form a heterocyclic radical.
57. The ligand defined in claim 56 wherein R4 and R5 are selected from the group consisting of hydrogen atoms or alkyl, aryl, alkoxy, aroxy, amino, or amido radicals, or mixtures thereof.
58. The process defined in claim 2 wherein the catalyst activator is selected from the group consisting of tri- or tetra coordinate aluminum compounds, aluminum hydrides, tri- or tetra alkyl boron compounds, and organozinc compounds.
59. The reaction product defined in claim 26 wherein the catalyst activator is selected from the group consisting of tri- or tetra coordinate aluminum compounds, aluminum hydrides, tri- or tetra alkyl boron compounds, and organozinc compounds.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US887,183 | 1986-07-21 | ||
| US06/887,183 US4689437A (en) | 1986-07-21 | 1986-07-21 | Oligomerization to alpha-olefins |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1329608C true CA1329608C (en) | 1994-05-17 |
Family
ID=25390621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000542205A Expired - Fee Related CA1329608C (en) | 1986-07-21 | 1987-07-15 | Oligomerization to alpha-olefins |
Country Status (18)
| Country | Link |
|---|---|
| US (1) | US4689437A (en) |
| EP (1) | EP0254277B1 (en) |
| JP (5) | JPH0764759B2 (en) |
| KR (1) | KR920003609B1 (en) |
| CN (2) | CN1022989C (en) |
| AR (1) | AR243858A1 (en) |
| AT (1) | ATE86957T1 (en) |
| AU (1) | AU597397B2 (en) |
| BR (1) | BR8703795A (en) |
| CA (1) | CA1329608C (en) |
| DE (1) | DE3784800T2 (en) |
| ES (1) | ES2046185T3 (en) |
| FI (1) | FI88802C (en) |
| GR (1) | GR3008105T3 (en) |
| MY (1) | MY101763A (en) |
| NO (1) | NO173600C (en) |
| NZ (1) | NZ221148A (en) |
| ZA (1) | ZA875353B (en) |
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-
1986
- 1986-07-21 US US06/887,183 patent/US4689437A/en not_active Expired - Lifetime
-
1987
- 1987-07-15 CA CA000542205A patent/CA1329608C/en not_active Expired - Fee Related
- 1987-07-21 BR BR8703795A patent/BR8703795A/en not_active Application Discontinuation
- 1987-07-21 DE DE8787110563T patent/DE3784800T2/en not_active Expired - Fee Related
- 1987-07-21 FI FI873199A patent/FI88802C/en not_active IP Right Cessation
- 1987-07-21 JP JP62180193A patent/JPH0764759B2/en not_active Expired - Fee Related
- 1987-07-21 EP EP87110563A patent/EP0254277B1/en not_active Expired - Lifetime
- 1987-07-21 ES ES198787110563T patent/ES2046185T3/en not_active Expired - Lifetime
- 1987-07-21 CN CN90106511A patent/CN1022989C/en not_active Expired - Fee Related
- 1987-07-21 KR KR1019870007905A patent/KR920003609B1/en not_active IP Right Cessation
- 1987-07-21 CN CN87105841A patent/CN1011694B/en not_active Expired
- 1987-07-21 ZA ZA875353A patent/ZA875353B/en unknown
- 1987-07-21 MY MYPI87001074A patent/MY101763A/en unknown
- 1987-07-21 NO NO873048A patent/NO173600C/en unknown
- 1987-07-21 AU AU75949/87A patent/AU597397B2/en not_active Ceased
- 1987-07-21 AT AT87110563T patent/ATE86957T1/en not_active IP Right Cessation
- 1987-07-21 NZ NZ221148A patent/NZ221148A/en unknown
- 1987-07-21 AR AR87308203A patent/AR243858A1/en active
-
1993
- 1993-06-10 GR GR920403058T patent/GR3008105T3/el unknown
-
1994
- 1994-10-18 JP JP6277210A patent/JP2915302B2/en not_active Expired - Fee Related
-
1997
- 1997-09-09 JP JP9259390A patent/JP2948181B2/en not_active Expired - Fee Related
- 1997-09-09 JP JP9259388A patent/JP2930921B2/en not_active Expired - Fee Related
- 1997-09-09 JP JP9259389A patent/JP2920126B2/en not_active Expired - Fee Related
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