US20050038302A1 - Systems and methods for producing fluorocarbons - Google Patents

Systems and methods for producing fluorocarbons Download PDF

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Publication number
US20050038302A1
US20050038302A1 US10/641,527 US64152703A US2005038302A1 US 20050038302 A1 US20050038302 A1 US 20050038302A1 US 64152703 A US64152703 A US 64152703A US 2005038302 A1 US2005038302 A1 US 2005038302A1
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catalyst
saturated
fluorocarbon
hydrogen
mole ratio
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US10/641,527
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Vicki Hedrick
Janet Boggs
Stephan Brandstadter
Mitchel Cohn
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Great Lakes Chemical Corp
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PCBU Services Inc
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Priority to US10/641,527 priority Critical patent/US20050038302A1/en
Assigned to PCBU SERVICES, INC. reassignment PCBU SERVICES, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BOGGS, JANET K., BRANDSTADTER, STEPHAN M., COHN, MITCHEL, HEDRICK, VICKI E.
Priority to MXPA06001631A priority patent/MXPA06001631A/en
Priority to CA002535361A priority patent/CA2535361A1/en
Priority to JP2006523209A priority patent/JP2007502274A/en
Priority to PCT/US2004/023917 priority patent/WO2005019142A1/en
Priority to AU2004267038A priority patent/AU2004267038A1/en
Priority to BRPI0413517-2A priority patent/BRPI0413517A/en
Priority to CNA2004800258003A priority patent/CN1849283A/en
Priority to RU2006107535/04A priority patent/RU2332396C2/en
Priority to KR1020067002908A priority patent/KR100807626B1/en
Priority to EP04779125A priority patent/EP1654208A1/en
Publication of US20050038302A1 publication Critical patent/US20050038302A1/en
Priority to US11/069,180 priority patent/US7368089B2/en
Priority to ZA200601100A priority patent/ZA200601100B/en
Assigned to GREAT LAKES CHEMICAL CORPORATION reassignment GREAT LAKES CHEMICAL CORPORATION MERGER (SEE DOCUMENT FOR DETAILS). Assignors: GLK SERVICES, INC., PABU SERVICES, INC., PCBU SERVICES, INC.
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C17/00—Preparation of halogenated hydrocarbons
    • C07C17/35—Preparation of halogenated hydrocarbons by reactions not affecting the number of carbon or of halogen atoms in the reaction
    • C07C17/354—Preparation of halogenated hydrocarbons by reactions not affecting the number of carbon or of halogen atoms in the reaction by hydrogenation
    • 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
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
    • B01J23/89—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with noble metals
    • B01J23/8926—Copper and noble metals
    • 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
    • B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
    • B01J27/06—Halogens; Compounds thereof
    • B01J27/08—Halides
    • 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
    • B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
    • B01J27/06—Halogens; Compounds thereof
    • B01J27/128—Halogens; Compounds thereof with iron group metals or platinum group metals
    • 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
    • B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
    • B01J27/06—Halogens; Compounds thereof
    • B01J27/128—Halogens; Compounds thereof with iron group metals or platinum group metals
    • B01J27/13—Platinum group metals
    • B01J35/19—
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C17/00—Preparation of halogenated hydrocarbons
    • C07C17/23—Preparation of halogenated hydrocarbons by dehalogenation
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C21/00—Acyclic unsaturated compounds containing halogen atoms
    • C07C21/02—Acyclic unsaturated compounds containing halogen atoms containing carbon-to-carbon double bonds
    • C07C21/18—Acyclic unsaturated compounds containing halogen atoms containing carbon-to-carbon double bonds containing fluorine
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals
    • Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts

Definitions

  • the present invention relates to the production of fluorocarbons. Aspects of the present invention relate to the production of saturated and unsaturated fluorocarbons.
  • Hydrofluorocarbons and fluoromonomers such as 1,1,1,2,3,3,3-heptafluoropropane (CF 3 CHFCF 3 , HFC-227ea) and hexafluoropropene (CF 3 CF ⁇ CF 2 , FC-1216, HFP) are commercially desired.
  • HFP is widely employed as a monomer for the production of fluorine-containing polymers, for example, the thermoplastic FEP (“fluorinated-ethylene-propylene”) resins, formed via the copolymerization of tetrafluoroethylene and hexafluoropropene (see for example, Fluorine Chemistry: A Comprehensive Treatment, M. Howe-Grant, ed., Wiley & Sons, New York, N.Y., 1995, page 404).
  • FEP fluorinated-ethylene-propylene
  • HFC-227ea has found use as a blowing agent (U.S. Pat. No. 5,314,926; U.S. Pat. No. 5,278,196), refrigerant (Chen, J., Sci. Tech. Froid (1994), (2 CFCS, the Day After), 133-145), and propellant for use in metered dose inhalers (Clark, R., Aerosol. Sci. Technol ., (1995) 22, 374-391).
  • the compound has also found widespread use as a fire suppression agent, for example, the protection of telecommunication facilities where it is marketed under the tradename FM-200® (Great Lakes Chemical Corporation, Indianapolis, Ind.) (Robin, M. L., Process Safety Progress , Volume 19, No. 2 (Summer 2000), p. 107-111).
  • HFC-227ea has also been produced via the treatment of 1,1,1,3,3,3-hexafluoropropane (CF 3 CH 2 CF 3 , HFC-236fa) with elemental fluorine (U.S. Pat. No. 5,780,691) and via the treatment of 2-chloro-1,1,1,3,3,3-hexafluoropropane (CFC-217ba) with HF (WO 99/40053).
  • Systems for producing fluorocarbons include, in some aspects, a reactant stream comprising a saturated halogenated fluorocarbon, a reactor configured to bring the saturated halogenated fluorocarbon into reactive proximity with a catalyst that includes Cu and Pd, and a product stream comprising saturated and unsaturated fluorocarbons.
  • methods for preparing fluorinated compounds include contacting a reactant mixture that includes a C-3 saturated halogenated fluorocarbon and hydrogen with a catalyst having Pd and one or both of Ni and Cu. Such forms a mixture that includes a C-3 saturated hydrofluorocarbon and a C-3 unsaturated fluorocarbon.
  • methods are described for contacting CF 3 CCl 2 CF 3 with hydrogen in the presence of a catalyst to produce a mixture that includes one or more of CF 3 CH 2 CF 3 , CF 3 CHClCF 3 , CF 3 CH ⁇ CF 2 , and CF 3 CCl ⁇ CF 2 .
  • Methods for preparing fluorinated compounds include contacting a reactant mixture comprising a C-3 saturated halogenated fluorocarbon and hydrogen with a catalyst having one or more of K, Zr, Na, Ni, Cu, W, Zn, Fe, Mn, Co, Ti, and Pd to form a mixture that includes a C-3 unsaturated fluorocarbon and at least about 35% C-3 saturated hydrofluorocarbon.
  • aspects of the present invention also provide methods for producing fluorocarbons that include contacting a reactant mixture comprising CF 3 CClFCF 3 and hydrogen with a catalyst system that includes about 9:1 Cu to Pd (weight ratio) and activated carbon.
  • aspects of the present invention can also include contacting a reaction mixture comprising CF 3 CClFCF 3 with a catalyst system that includes about 9:1 Cu to Pd (weight ratio) for about 9 to about 55 seconds at a pressure of about 1.0 kg/cm 2 to about 10 kg/cm 2 and at a temperature of about 220° C. to about 350° C. to form a mixture comprising CF 3 CHFCF 3 and CF 3 CF ⁇ CF 2 .
  • a catalyst system that includes about 9:1 Cu to Pd (weight ratio) for about 9 to about 55 seconds at a pressure of about 1.0 kg/cm 2 to about 10 kg/cm 2 and at a temperature of about 220° C. to about 350° C.
  • FIG. 1 is a diagram of an exemplary system for fluorocarbon production in accordance with an aspect of the present invention.
  • FIG. 2 is a diagram of an exemplary system for fluorocarbon production in accordance with another aspect of the present invention.
  • FIG. 1 depicts a fluorination reaction system 1 that includes a reactor 3 , saturated halogenated fluorocarbon reactant 5 , hydrogenation reactant 7 , and product 9 .
  • saturated halogenated fluorocarbon 5 that can be utilized in accordance of the present invention include those saturated halogenated fluorocarbons that are fully halogenated, as well as, those that are less than fully halogenated.
  • saturated halogenated fluorocarbon 5 includes C-3 saturated halogenated fluorocarbons.
  • saturated halogenated fluorocarbon 5 include CF 3 CClFCF 3 (CFC-217ba) and/or CF 3 CCl 2 CF 3 (CFC-216aa).
  • Hydrogenation reactant 7 can include hydrogen.
  • An exemplary hydrogenation reactant 7 includes diatomic hydrogen.
  • saturated halogenated fluorocarbon reactant 5 and hydrogenation reactant 7 can together form all or part of a reactant mixture and/or a reactant stream. As depicted in FIG. 1 , saturated halogenated fluorocarbon reactant 5 and hydrogenation reactant 7 are provided to reactor 3 via independent streams. The present invention should not be so limited. Saturated halogenated fluorocarbon reactant 5 and hydrogenation reactant 7 may be combined prior to being transferred to reactor 3 or may be provided to reactor 3 via separate streams as illustrated.
  • Saturated halogenated fluorocarbon 5 may also be combined with hydrogenation reactant 7 at particular mole ratios.
  • An aspect of the present invention provides combining hydrogenation reactant 7 and saturated halogenated fluorocarbon 5 at a mole ratio of hydrogenation reactant 7 to saturated halogenated fluorocarbon 5 from about 1:1 to about 20:1.
  • Exemplary mole ratios of hydrogenation reactant 7 to saturated halogenated fluorocarbon 5 also include about 2.5:1 to about 20:1, about 1:1 to about 15:1, about 2:1 to about 10:1, and/or about 1:1 to about 5:1.
  • FIG. 2 illustrates a system 20 for preparing fluorocarbons according to the present invention that includes saturated halogenated fluorocarbon reactant 5 , hydrogenation reactant 7 , and diluent 13 .
  • diluent 13 that can be used in accordance with the present invention include hydrogen, helium, and argon gases, as well as, compounds such as CF 3 CFHCF 3 (HFC-227ea) and CF 3 CH 2 F (HFC-134a).
  • Diluent 13 can be utilized in combination with hydrogenation reactant 7 and saturated halogenated fluorocarbon 5 at particular mole ratios.
  • Examples of mole ratios useful in accordance with the present invention are diluent 13 to hydrogenation reactant 7 to saturated halogenated fluorocarbon reactant 5 ratios of from about 2:0.6:1 to about 15:5:1 and/or from about 3:1:1 to about 14:2.5:1.
  • reactor 3 is configured to bring the reactant mixture into reactive proximity with catalyst 11 .
  • Reactor 3 can include, but are not limited to, reactors such as those manufactured of Inconel® (INCO ALLOYS INTERNATIONAL, INC, Delaware) and configured to perform chemical reactions on a laboratory or industrial scale.
  • Catalyst 11 can comprise, consist essentially of, and/or consist of one or more catalyst precursors such as K, Zr, Na, Ni, W, Cu, Zn, Fe, Mn, Co, Ti, and Pd.
  • catalyst 11 comprises, consists essentially of, and/or consists of Pd and one or both of Ni and Cu.
  • Catalyst 11 may include Cu and Pd at a weight ratio of Cu to Pd of from about 3:1 to about 28:1, about 8:1 to about 28:1, and/or a weight ratio of Cu to Pd of about 9:1.
  • Catalyst 11 can be in pure or supported form.
  • supports that can be utilized in accordance with the present invention include activated carbon, aluminum oxide, and/or silica gel supports.
  • An exemplary activated carbon support includes Tekeda activated carbon (Takeda Chemical Industries, Ltd., Higashi-ku, Osaka JAPAN).
  • catalysts can be prepared according to accepted catalyst preparation techniques. Exemplary techniques include dissolving the selected catalyst precursor in a suitable solvent with or without support, removing solvent from the catalyst and/or support, and loading the reactor with the catalyst. Once in the reactor, the catalyst can be further prepared by heating the reactor and monitoring the evolution of solvent from the catalyst.
  • the catalyst may be prepared and/or activated in the presence of gases such as hydrogen, helium, argon, and/or nitrogen.
  • the present invention also provides specific temperatures, pressures, and contact times within the reactor to facilitate the production of fluorocarbons.
  • Systems and methods of the present invention also provide for contacting the reactant mixture with catalyst 11 within reactor 3 for specific amounts of time. This time is typically referred to as contact time and can be calculated from the flow rates of the reactants and the volume of the reactor containing catalyst.
  • Exemplary contact times useful in accordance with the present invention can be from about 4 to about 75 seconds, from about 9 to about 55 seconds, from about 6 to about 30 seconds, and/or from about 10 to about 15 seconds.
  • the reaction temperature during contacting of catalyst 11 with the reaction mixture can be from about 100° C. to about 500° C., about 200° C. to about 400° C., about 220° C. to about 350° C. and/or about 220° C. to about 300° C.
  • Methods also provide for contacting the reactant mixture with catalyst 11 at pressures from about 1 kg/cm 2 to about 150 kg/cm 2 , about 5 kg/cm 2 to about 10 kg/cm 2 , or about 3 kg/cm 2 to about 8 kg/cm 2 .
  • Product mixture 9 can include saturated fluorocarbons such as hydrofluorocarbons and C-3 saturated hydrofluorocarbons.
  • Exemplary components of product mixture 9 can include CF 3 CFHCF 3 (HFC-227ea), CF 3 CH 2 CF 3 (HFC-236fa), and/or CF 3 CHClCF 3 (CFC-226da).
  • Product mixture 9 also includes an unsaturated fluorocarbon that can include C-3 unsaturated hydrofluorocarbons such as one or more of CF 3 CF ⁇ CF 2 (HFP, FC-1215yc), CF 3 CH ⁇ CF 2 (PFP, FC-1215zc), and/or CF 3 CCl ⁇ CF 2 (CFC-1215xc).
  • C-3 unsaturated hydrofluorocarbons such as one or more of CF 3 CF ⁇ CF 2 (HFP, FC-1215yc), CF 3 CH ⁇ CF 2 (PFP, FC-1215zc), and/or CF 3 CCl ⁇ CF 2 (CFC-1215xc).
  • Exemplary aspects of the present invention include product mixtures that include CF 3 CHFCF 3 (HFC-227ea) and CF 3 CF ⁇ CF 2 (FC-1215yc).
  • exemplary aspects of the present invention include product mixtures that include one or more of CF 3 CH 2 CF 3 (HFC-236fa), CF 3 CHClCF 3 (CFC-226da), CF 3 CH ⁇ CF 2 (FC-1215zc), and/or CF 3 CCl ⁇ CF 2 (CFC-1215xc).
  • product mixture 9 can be at least about 35% saturated fluorocarbon.
  • Catalysts utilized in the subsequent examples are prepared in accordance with the following methods.
  • the catalyst is prepared by weighing amounts of Takeda® activated carbon support and catalyst precursor into a beaker. Enough water, as a solvent, is added to cover the support and precursor and the mixture is stirred for approximately 15 minutes. The mixture is filtered under water aspirator pressure, and the catalyst is allowed to air dry. The catalyst is packed into the reactor and is heated at 150° C. under a N 2 stream until no water vapor is visibly apparent exiting the reactor. The heat is then increased to 200° C. until again no water vapor is visibly apparent exiting the reactor.
  • the catalyst is prepared by weighing amounts of Takeda® activated carbon support and catalyst precursor into a beaker. Enough CH 2 Cl 2 , as a solvent, is added to cover the support and precursor, and the mixture is stirred for approximately 15 minutes. The mixture is filtered under water aspirator pressure and the catalyst is allowed to air dry. The catalyst is packed into the reactor and is heated at 150° C. under a N 2 stream until no vapor is visibly apparent exiting the reactor. The heat is then increased to 200° C. until no vapor is visibly apparent exiting the reactor.
  • the catalyst is prepared by weighing amounts of Takeda® activated carbon support and catalyst precursor into a beaker. Enough water, as a solvent, is added to cover the support and precursor and the mixture is stirred for approximately 15 minutes. Sufficient NaOH is added to make the mixture alkaline (pH ⁇ 12). The mixture is then chilled in an ice bath to 10° C. NaBH 4 dissolved in NaOH is added drop-wise until reduction of the catalyst is achieved. The mixture is then heated to boiling until a dry catalyst remained. The catalyst mixture is then filtered and rinsed twice with water before being dried in vacuum oven for approximately 1.5 hours. The catalyst is then packed into a reactor and dried as in Method A.
  • the catalyst is prepared by weighing amounts of Takeda® activated carbon support and catalyst precursor into a beaker. Sufficient 5% (wt./wt.) HCl/water solution is added to the beaker to cover the support and precursor, and the mixture is heated to 100° C. for approximately 20 minutes. The mixture is then filtered, packed and dried as described in Method A.
  • the catalyst is prepared by weighing amounts of catalyst precursor into a beaker and covering with 5% (wt./wt.) HCl/water solution to form a mixture. The mixture is heated to 100° C. for approximately 20 minutes. To complete the catalyst, sufficient Takeda® activated carbon support to achieve the weight percent indicated is then added to the hot solution. The mixture is then hot filtered and dried as in Method A.
  • a catalyst of Cu, Pd, and support is prepared by weighing an amount of the catalyst precursor Cu into a beaker containing water. The solution is heated, and the percent Cu dissolved in the solution is then determined periodically until sufficient Cu is dissolved in the solution. Catalyst precursor Pd is weighed and placed in a beaker containing water. The solution is heated and the percent Pd dissolved in the solution is then determined periodically until sufficient Pd is dissolved in the solution. The Cu and Pd solutions are combined in a beaker to yield the desired ratios. Sufficient Takeda activated carbon support is added and the solution stirred. The catalyst is air-dried and packed into the reactor and dried as described in Method A.
  • a catalyst of catalyst precursor is packed into the reactor.
  • the reactor is heated to 350° C., and H 2 is passed over the catalyst at 126 cc/min for 16 hours.
  • a solution of 5% (wt./wt.) HCl and water is added to the catalyst precursor in a sufficient amount to wet the catalyst precursor.
  • the wet catalyst is then dried under a N 2 stream overnight before being packed and dried as in Method A.
  • Catalyst is prepared as in Method E with the additional steps of reapplying the hot filtrate to the catalyst at least twice.
  • the reactor of examples 1-8 is a 36.20 cm long Inconel® tube with 1.27 cm outside diameter and a 33.0 cc volume.
  • the reactor is mounted vertically in a Hoskins® (Hoskins Manufacturing Company Corporation. Hamburg, Mich.) electric furnace with a 30.5 cm heated zone controlled with a Watlow® (Watlow Electric Manufacturing Company, St. Louis, Mo.) series 956 temperature control unit.
  • the reactor is equipped with internal and external thermocouples and a pressure gauge. Reactants are fed through calibrated Matheson® (Matheson Gas Products, Inc., Valley Forge, Pa.) flow meters and premixed before entering the heated zone.
  • Hydrogen is fed through a calibrated Hastings® (Teledyne Hastings Instruments, Teledyne Technologies, Inc., Los Angeles, Calif.) mass flow controller model HFC-202c with model 400 Hastings® power supply.
  • CFC-217ba is fed with calibrated Eldex® (Eldex Laboratories, Inc., Napa, Calif.) metering pumps models A-60-S or B-100-S.
  • the reactants are premixed and heated in a vaporizer before entering the reactor. Pressure is controlled with a proportional valve, driver module, and a Watlow® series 956 control unit.
  • the exit gases are scrubbed through water, passed over Drierite® (W.A.

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Abstract

Systems and methods for producing fluorocarbons are provided that include contacting a saturated halogenated fluorocarbon with hydrogen and catalyst to produce a saturated hydrofluorocarbon and an unsaturated fluorocarbon. Aspects of the present invention describe systems and methods for contacting saturated halogenated fluorocarbons such as CF3CClFCF3 and/or CF3CCl2CF3 with hydrogen and catalyst. Systems and methods of the present invention also describe contacting saturated halogenated fluorocarbons with catalysts having one or more of K, Zr, Na, Ni, Cu, Ni, Zn, Fe, Mn, Co, Ti, and Pd. Aspects of the present invention also describe contacting saturated halogenated fluorocarbons with hydrogen under pressure. Saturated hydroflourocarbons and unsaturated fluorocarbons produced in accordance with the systems and methods of the present invention can include one or more of CF3CFHCF3, CF3CH2CF3, CF3CHClCF3, CF3CF═CF2, CF3CH═CF2, and CF3CCl═CF2.

Description

    TECHNICAL FIELD
  • The present invention relates to the production of fluorocarbons. Aspects of the present invention relate to the production of saturated and unsaturated fluorocarbons.
    • BACKGROUND OF THE INVENTION
  • Hydrofluorocarbons and fluoromonomers such as 1,1,1,2,3,3,3-heptafluoropropane (CF3CHFCF3, HFC-227ea) and hexafluoropropene (CF3CF═CF2, FC-1216, HFP) are commercially desired.
  • HFP is widely employed as a monomer for the production of fluorine-containing polymers, for example, the thermoplastic FEP (“fluorinated-ethylene-propylene”) resins, formed via the copolymerization of tetrafluoroethylene and hexafluoropropene (see for example, Fluorine Chemistry: A Comprehensive Treatment, M. Howe-Grant, ed., Wiley & Sons, New York, N.Y., 1995, page 404).
  • HFC-227ea has found use as a blowing agent (U.S. Pat. No. 5,314,926; U.S. Pat. No. 5,278,196), refrigerant (Chen, J., Sci. Tech. Froid (1994), (2 CFCS, the Day After), 133-145), and propellant for use in metered dose inhalers (Clark, R., Aerosol. Sci. Technol., (1995) 22, 374-391). The compound has also found widespread use as a fire suppression agent, for example, the protection of telecommunication facilities where it is marketed under the tradename FM-200® (Great Lakes Chemical Corporation, Indianapolis, Ind.) (Robin, M. L., Process Safety Progress, Volume 19, No. 2 (Summer 2000), p. 107-111).
  • Numerous methods are disclosed in the prior art for the preparation of halogenated compounds. These methods vary widely, due in part to the different halogens and functional groups involved. The prior art demonstrates that known methods do not readily translate into predictable applications for other compounds
  • Methods have been reported for the production of FC-1216. These processes include the thermal cracking of tetrafluoroethylene (TFE) at reduced pressure and temperatures of 700 C to 800 C as well as the pyrolysis of polytetrafluoroethylene under vacuum at elevated temperatures can yield HFP.
  • Methods have been reported for the production of HFC-227ea. The vapor phase reaction between HFP and HF over an active carbon catalyst can produce HFC-227ea (GB 902,590). HFC-227ea has also been produced via the treatment of 1,1,1,3,3,3-hexafluoropropane (CF3CH2CF3, HFC-236fa) with elemental fluorine (U.S. Pat. No. 5,780,691) and via the treatment of 2-chloro-1,1,1,3,3,3-hexafluoropropane (CFC-217ba) with HF (WO 99/40053).
  • It is desired to develop new methods and systems for economically favorable production of HFP and HFC-227ea, and it would be desired for such methods and systems to have broad utility for the production of saturated and unsaturated fluorocarbons.
    • SUMMARY OF THE INVENTION
  • Systems for producing fluorocarbons are provided that include, in some aspects, a reactant stream comprising a saturated halogenated fluorocarbon, a reactor configured to bring the saturated halogenated fluorocarbon into reactive proximity with a catalyst that includes Cu and Pd, and a product stream comprising saturated and unsaturated fluorocarbons.
  • According to an aspect of the present invention, methods for preparing fluorinated compounds are described that include contacting a reactant mixture that includes a C-3 saturated halogenated fluorocarbon and hydrogen with a catalyst having Pd and one or both of Ni and Cu. Such forms a mixture that includes a C-3 saturated hydrofluorocarbon and a C-3 unsaturated fluorocarbon.
  • In an aspect of the present invention, methods are described for contacting CF3CCl2CF3 with hydrogen in the presence of a catalyst to produce a mixture that includes one or more of CF3CH2CF3, CF3CHClCF3, CF3CH═CF2, and CF3CCl═CF2.
  • Methods for preparing fluorinated compounds are also described that include contacting a reactant mixture comprising a C-3 saturated halogenated fluorocarbon and hydrogen with a catalyst having one or more of K, Zr, Na, Ni, Cu, W, Zn, Fe, Mn, Co, Ti, and Pd to form a mixture that includes a C-3 unsaturated fluorocarbon and at least about 35% C-3 saturated hydrofluorocarbon.
  • Aspects of the present invention also provide methods for producing fluorocarbons that include contacting a reactant mixture comprising CF3CClFCF3 and hydrogen with a catalyst system that includes about 9:1 Cu to Pd (weight ratio) and activated carbon.
  • Aspects of the present invention can also include contacting a reaction mixture comprising CF3CClFCF3 with a catalyst system that includes about 9:1 Cu to Pd (weight ratio) for about 9 to about 55 seconds at a pressure of about 1.0 kg/cm2 to about 10 kg/cm2 and at a temperature of about 220° C. to about 350° C. to form a mixture comprising CF3CHFCF3 and CF3CF═CF2.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • Preferred embodiments of the invention are described below with reference to the following accompanying drawings.
  • FIG. 1. is a diagram of an exemplary system for fluorocarbon production in accordance with an aspect of the present invention.
  • FIG. 2. is a diagram of an exemplary system for fluorocarbon production in accordance with another aspect of the present invention.
    • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • This disclosure of the invention is submitted in furtherance of the constitutional purposes of the U.S. Patent Laws “to promote the progress of science and useful arts” (Article 1, Section 8).
  • In one embodiment of the present invention, methods and systems are described for producing a co-stream of two products. Aspects of the present invention will be described with reference to FIGS. 1 and 2.
  • FIG. 1 depicts a fluorination reaction system 1 that includes a reactor 3, saturated halogenated fluorocarbon reactant 5, hydrogenation reactant 7, and product 9. Examples of saturated halogenated fluorocarbon 5 that can be utilized in accordance of the present invention include those saturated halogenated fluorocarbons that are fully halogenated, as well as, those that are less than fully halogenated. According to an aspect of the present invention, saturated halogenated fluorocarbon 5 includes C-3 saturated halogenated fluorocarbons. Examples of saturated halogenated fluorocarbon 5 include CF3CClFCF3 (CFC-217ba) and/or CF3CCl2CF3 (CFC-216aa).
  • Hydrogenation reactant 7 can include hydrogen. An exemplary hydrogenation reactant 7 includes diatomic hydrogen.
  • Generally, saturated halogenated fluorocarbon reactant 5 and hydrogenation reactant 7 can together form all or part of a reactant mixture and/or a reactant stream. As depicted in FIG. 1, saturated halogenated fluorocarbon reactant 5 and hydrogenation reactant 7 are provided to reactor 3 via independent streams. The present invention should not be so limited. Saturated halogenated fluorocarbon reactant 5 and hydrogenation reactant 7 may be combined prior to being transferred to reactor 3 or may be provided to reactor 3 via separate streams as illustrated.
  • Saturated halogenated fluorocarbon 5 may also be combined with hydrogenation reactant 7 at particular mole ratios. An aspect of the present invention provides combining hydrogenation reactant 7 and saturated halogenated fluorocarbon 5 at a mole ratio of hydrogenation reactant 7 to saturated halogenated fluorocarbon 5 from about 1:1 to about 20:1. Exemplary mole ratios of hydrogenation reactant 7 to saturated halogenated fluorocarbon 5 also include about 2.5:1 to about 20:1, about 1:1 to about 15:1, about 2:1 to about 10:1, and/or about 1:1 to about 5:1.
  • Aspects of the present invention also provide for the addition of a diluent. FIG. 2 illustrates a system 20 for preparing fluorocarbons according to the present invention that includes saturated halogenated fluorocarbon reactant 5, hydrogenation reactant 7, and diluent 13. Examples of diluent 13 that can be used in accordance with the present invention include hydrogen, helium, and argon gases, as well as, compounds such as CF3CFHCF3 (HFC-227ea) and CF3CH2F (HFC-134a). Diluent 13 can be utilized in combination with hydrogenation reactant 7 and saturated halogenated fluorocarbon 5 at particular mole ratios. Examples of mole ratios useful in accordance with the present invention are diluent 13 to hydrogenation reactant 7 to saturated halogenated fluorocarbon reactant 5 ratios of from about 2:0.6:1 to about 15:5:1 and/or from about 3:1:1 to about 14:2.5:1.
  • Referring again to FIG. 1, the reactant mixture can be contacted with a catalyst 11 within a reactor 3. According to aspects of the present invention, reactor 3 is configured to bring the reactant mixture into reactive proximity with catalyst 11. Reactor 3 can include, but are not limited to, reactors such as those manufactured of Inconel® (INCO ALLOYS INTERNATIONAL, INC, Delaware) and configured to perform chemical reactions on a laboratory or industrial scale.
  • Catalyst 11 can comprise, consist essentially of, and/or consist of one or more catalyst precursors such as K, Zr, Na, Ni, W, Cu, Zn, Fe, Mn, Co, Ti, and Pd. In particular aspects, catalyst 11 comprises, consists essentially of, and/or consists of Pd and one or both of Ni and Cu. Catalyst 11 may include Cu and Pd at a weight ratio of Cu to Pd of from about 3:1 to about 28:1, about 8:1 to about 28:1, and/or a weight ratio of Cu to Pd of about 9:1. Catalyst 11 can be in pure or supported form. Examples of supports that can be utilized in accordance with the present invention include activated carbon, aluminum oxide, and/or silica gel supports. An exemplary activated carbon support includes Tekeda activated carbon (Takeda Chemical Industries, Ltd., Higashi-ku, Osaka JAPAN).
  • Typically catalysts can be prepared according to accepted catalyst preparation techniques. Exemplary techniques include dissolving the selected catalyst precursor in a suitable solvent with or without support, removing solvent from the catalyst and/or support, and loading the reactor with the catalyst. Once in the reactor, the catalyst can be further prepared by heating the reactor and monitoring the evolution of solvent from the catalyst. The catalyst may be prepared and/or activated in the presence of gases such as hydrogen, helium, argon, and/or nitrogen.
  • The present invention also provides specific temperatures, pressures, and contact times within the reactor to facilitate the production of fluorocarbons. Systems and methods of the present invention also provide for contacting the reactant mixture with catalyst 11 within reactor 3 for specific amounts of time. This time is typically referred to as contact time and can be calculated from the flow rates of the reactants and the volume of the reactor containing catalyst. Exemplary contact times useful in accordance with the present invention can be from about 4 to about 75 seconds, from about 9 to about 55 seconds, from about 6 to about 30 seconds, and/or from about 10 to about 15 seconds.
  • In an exemplary aspect, the reaction temperature during contacting of catalyst 11 with the reaction mixture can be from about 100° C. to about 500° C., about 200° C. to about 400° C., about 220° C. to about 350° C. and/or about 220° C. to about 300° C.
  • Methods also provide for contacting the reactant mixture with catalyst 11 at pressures from about 1 kg/cm2 to about 150 kg/cm2, about 5 kg/cm2 to about 10 kg/cm2, or about 3 kg/cm2 to about 8 kg/cm2.
  • Referring to FIGS. 1 and 2, systems are depicted for producing a product mixture 9. Product mixture 9 can include saturated fluorocarbons such as hydrofluorocarbons and C-3 saturated hydrofluorocarbons. Exemplary components of product mixture 9 can include CF3CFHCF3 (HFC-227ea), CF3CH2CF3 (HFC-236fa), and/or CF3CHClCF3 (CFC-226da). Product mixture 9 also includes an unsaturated fluorocarbon that can include C-3 unsaturated hydrofluorocarbons such as one or more of CF3CF═CF2 (HFP, FC-1215yc), CF3CH═CF2 (PFP, FC-1215zc), and/or CF3CCl═CF2 (CFC-1215xc). Exemplary aspects of the present invention include product mixtures that include CF3CHFCF3 (HFC-227ea) and CF3CF═CF2 (FC-1215yc). Other exemplary aspects of the present invention include product mixtures that include one or more of CF3CH2CF3 (HFC-236fa), CF3CHClCF3 (CFC-226da), CF3CH═CF2 (FC-1215zc), and/or CF3CCl═CF2 (CFC-1215xc). Aspects of the present invention also provide product mixture 9 that can be at least about 35% saturated fluorocarbon.
  • Aspects of the present invention are further described with reference to the following non-limiting examples.
  • Catalyst Preparation
  • Catalysts utilized in the subsequent examples are prepared in accordance with the following methods.
    • Method A
  • The catalyst is prepared by weighing amounts of Takeda® activated carbon support and catalyst precursor into a beaker. Enough water, as a solvent, is added to cover the support and precursor and the mixture is stirred for approximately 15 minutes. The mixture is filtered under water aspirator pressure, and the catalyst is allowed to air dry. The catalyst is packed into the reactor and is heated at 150° C. under a N2 stream until no water vapor is visibly apparent exiting the reactor. The heat is then increased to 200° C. until again no water vapor is visibly apparent exiting the reactor.
    • Method B
  • The catalyst is prepared by weighing amounts of Takeda® activated carbon support and catalyst precursor into a beaker. Enough CH2Cl2, as a solvent, is added to cover the support and precursor, and the mixture is stirred for approximately 15 minutes. The mixture is filtered under water aspirator pressure and the catalyst is allowed to air dry. The catalyst is packed into the reactor and is heated at 150° C. under a N2 stream until no vapor is visibly apparent exiting the reactor. The heat is then increased to 200° C. until no vapor is visibly apparent exiting the reactor.
    • Method C
  • The catalyst is prepared by weighing amounts of Takeda® activated carbon support and catalyst precursor into a beaker. Enough water, as a solvent, is added to cover the support and precursor and the mixture is stirred for approximately 15 minutes. Sufficient NaOH is added to make the mixture alkaline (pH≧12). The mixture is then chilled in an ice bath to 10° C. NaBH4 dissolved in NaOH is added drop-wise until reduction of the catalyst is achieved. The mixture is then heated to boiling until a dry catalyst remained. The catalyst mixture is then filtered and rinsed twice with water before being dried in vacuum oven for approximately 1.5 hours. The catalyst is then packed into a reactor and dried as in Method A.
    • Method D
  • The catalyst is prepared by weighing amounts of Takeda® activated carbon support and catalyst precursor into a beaker. Sufficient 5% (wt./wt.) HCl/water solution is added to the beaker to cover the support and precursor, and the mixture is heated to 100° C. for approximately 20 minutes. The mixture is then filtered, packed and dried as described in Method A.
    • Method E
  • The catalyst is prepared by weighing amounts of catalyst precursor into a beaker and covering with 5% (wt./wt.) HCl/water solution to form a mixture. The mixture is heated to 100° C. for approximately 20 minutes. To complete the catalyst, sufficient Takeda® activated carbon support to achieve the weight percent indicated is then added to the hot solution. The mixture is then hot filtered and dried as in Method A.
    • Method F
  • A catalyst of Cu, Pd, and support is prepared by weighing an amount of the catalyst precursor Cu into a beaker containing water. The solution is heated, and the percent Cu dissolved in the solution is then determined periodically until sufficient Cu is dissolved in the solution. Catalyst precursor Pd is weighed and placed in a beaker containing water. The solution is heated and the percent Pd dissolved in the solution is then determined periodically until sufficient Pd is dissolved in the solution. The Cu and Pd solutions are combined in a beaker to yield the desired ratios. Sufficient Takeda activated carbon support is added and the solution stirred. The catalyst is air-dried and packed into the reactor and dried as described in Method A.
    • Method G
  • A catalyst of catalyst precursor is packed into the reactor. The reactor is heated to 350° C., and H2 is passed over the catalyst at 126 cc/min for 16 hours.
    • Method H
  • A solution of 5% (wt./wt.) HCl and water is added to the catalyst precursor in a sufficient amount to wet the catalyst precursor. The wet catalyst is then dried under a N2 stream overnight before being packed and dried as in Method A.
    • Method I
  • Catalyst is prepared as in Method E with the additional steps of reapplying the hot filtrate to the catalyst at least twice.
  • General Reaction Procedures
  • The reactor of examples 1-8 is a 36.20 cm long Inconel® tube with 1.27 cm outside diameter and a 33.0 cc volume. The reactor is mounted vertically in a Hoskins® (Hoskins Manufacturing Company Corporation. Hamburg, Mich.) electric furnace with a 30.5 cm heated zone controlled with a Watlow® (Watlow Electric Manufacturing Company, St. Louis, Mo.) series 956 temperature control unit. The reactor is equipped with internal and external thermocouples and a pressure gauge. Reactants are fed through calibrated Matheson® (Matheson Gas Products, Inc., Valley Forge, Pa.) flow meters and premixed before entering the heated zone.
  • Hydrogen is fed through a calibrated Hastings® (Teledyne Hastings Instruments, Teledyne Technologies, Inc., Los Angeles, Calif.) mass flow controller model HFC-202c with model 400 Hastings® power supply. CFC-217ba is fed with calibrated Eldex® (Eldex Laboratories, Inc., Napa, Calif.) metering pumps models A-60-S or B-100-S. The reactants are premixed and heated in a vaporizer before entering the reactor. Pressure is controlled with a proportional valve, driver module, and a Watlow® series 956 control unit. The exit gases are scrubbed through water, passed over Drierite® (W.A. Hammond Drierite Co., Xenia, Ohio), and analyzed by gas chromatography using a Hewlett-Packard® (Hewlett-Packard Company, Palo Alto, Calif.) 5890 series 11 gas chromatograph equipped with a 30 m×0.32 mm ID silicaplot™ (Varian, Inc., Palo Alto, Calif.) fused silica column and a flame ionization detector. Results are reported herein in area % of total area of response recorded by detector.
    • EXAMPLE 1 Potassium Catalysts
  • TABLE 1
    Catalyst Cat. Temp. Contact Time H2/CFC-217 % Selectivity
    Precursor Prep. (° C.) (sec) Mole Ratio % Conversion HFP HFC-227 Total
    10% KCl A 200 11.5 6.4 19.3 46.4 37.2 83.6
    10% KCl A 250 18.7 3.9 45.6 52.0 19.8 71.9
    10% KCl A 300 14.5 3 63.9 13.7 57.1 70.8
  • TABLE 2
    Catalyst Cat. Temp. Contact Time H2/CFC-217 % Selectivity
    Precursor Prep. (° C.) (sec) Mole Ratio % Conversion HFP HFC-227 Total
    10% KF A 300 10.6 4.1 6.9 6.2 65.9 72.1
    10% KF A 250 9.7 4.4 7.22 8.1 66.6 74.7
    10% KF A 300 9.6 7.1 14.0 49.3 27.5 76.8
    10% KF A 350 3.4 5.2 59.6 29.5 31.7 61.1
    10% KF A 400 7.9 5.6 38.7 24.7 20.4 55.0
    • EXAMPLE 2 Zirconium Catalysts
  • TABLE 3
    Catalyst Cat. Temp. Contact Time H2/CFC-217 % Selectivity
    Precursor Prep. (° C.) (sec) Mole Ratio % Conversion HFP HFC-227 Total
    10% ZrCl2 A 200 11.5 4.1 25.31 38.0 56.1 94.1
    10% ZrCl2 A 250 10.3 8.2 66.18 46.1 36.1 82.3
    10% ZrCl2 A 300 9.5 6.8 36.43 38.9 36.6 75.5
    10% ZrCl2 A 350 8.8 7.3 93.63 18.7 47.4 66.1
  • TABLE 4
    Catalyst Cat. Temp. Contact Time H2/CFC-217 % Selectivity
    Precursor Prep. (° C.) (sec) Mole Ratio % Conversion HFP HFC-227 Total
    10% ZrCl4 B 200 12.3 12.7 22.95 27.8 21.0 48.8
    10% ZrCl4 B 250 11.3 15.4 41.42 46.0 25.3 71.3
    10% ZrCl4 B 300 10.5 22.6 76.96 29.9 35.5 65.5
    10% ZrCl4 B 350 9.2 11.4 95.19 18.5 44.2 62.7
  • TABLE 5
    Catalyst Cat. Temp. Contact Time H2/CFC-217 % Selectivity
    Precursor Prep. (° C.) (sec) Mole Ratio % Conversion HFP HFC-227 Total
    10% CuZrCl2 B 200 12.2 11.8 18.24 30.6 61.3 91.9
    10% CuZrCl2 B 250 11.1 11.6 40.41 59.8 28.7 88.5
    10% CuZrCl2 B 300 9.2 11.2 40.47 49.3 35.6 84.9
    10% CuZrCl2 B 350 9.4 13.3 37.6 46.6 36.9 83.5
    10% CuZrCl2 B 400 7.6 11.8 31.24 28.0 52.8 80.9
    10% CuZrCl2 B 500 7.6 14.7 31.84 4.0 32.0 36.1
    • EXAMPLE 3 Tungsten Catalysts
  • TABLE 6
    Catalyst Cat. Temp. Contact Time H2/CFC-217 % Selectivity
    Precursor Prep. (° C.) (sec) Mole Ratio % Conversion HFP HFC-227 Total
    10% NaW A 200 12.1 10.3 23.1 44.5 40.3 84.7
    10% NaW A 250 11 11.5 49.98 56.0 25.8 81.8
    10% NaW A 300 10 10.1 95.19 40.2 27.0 87.2
    10% NaW A 350 9.1 9.7 94.98 30.5 28.3 58.8
    • EXAMPLE 4 Support
  • TABLE 7
    Cat. Temp. Contact Time H2/CFC-217 % Selectivity
    Catalyst Prep. (° C.) (sec) Mole Ratio % Conversion HFP HFC-227 Total
    Activated A 250 10.9 9.5 23.5 52.5 37.9 90.4
    Carbon
    Activated A 300 9.8 9 34.55 13.6 23.3 37.0
    Carbon
    Activated A 350 8.8 6.9 55.85 42.5 30.2 72.6
    Carbon
    Activated A 350 9.2 11 33.8 39.9 34.6 74.5
    Carbon
    • EXAMPLE 5 Nickel Catalysts
  • TABLE 8
    Catalyst Cat. Temp. Contact Time H2/CFC-217 % Selectivity
    Precursor Prep. (° C.) (sec) Mole Ratio % Conversion HFP HFC-227 Total
    NiF2 A 200 12.2 11.8 45.8 57.0 8.0 65.0
    NiF2 A 250 10.8 9.1 64.9 54.6 23.3 78.0
    NiF2 A 250 17.1 4.2 30.1 67.9 18.8 76.8
  • TABLE 9
    Catalyst Cat. Temp. Contact Time H2/CFC-217 % Selectivity
    Precursor Prep. (° C.) (sec) Mole Ratio % Conversion HFP HFC-227 Total
    10% NiCl2 C 200 11.8 7.9 67.0-3 44.3 43.7 87.9
    10% NiCl2 C 250 10.7 8.4 49.55 60.5 23.8 84.3
    10% NiCl2 C 300 10 10.6 81.11 57.6 23.4 81.0
    10% NiCl2 C 350 9.1 9.4 73.81 65.8 6.5 72.3
    10% NiCl2 C 350 9.3 12 57.52 61.1 20.5 81.6
  • TABLE 10
    Catalyst Cat. Temp. Contact Time H2/CFC-217 % Selectivity
    Precursor Prep. (° C.) (sec) Mole Ratio % Conversion HFP HFC-227 Total
    10% NiF2 D 200 6.4 9.9 96.86 34.5 62.1 96.6
    10% NiF2 D 250 7.8 2.5 92.9 48.6 27.9 76.5
    10% NiF2 D 250 5.5 10.2 79.46 65.0 22.9 87.9
  • TABLE 11
    Catalyst Cat. Temp. Contact Time H2/CFC-217 % Selectivity
    Precursor Prep. (° C.) (sec) Mole Ratio % Conversion HFP HFC-227 Total
    10% Ni(O) A 250 5.3 7.4 99.12 24.6 67.6 92.2
    10% Ni(O) A 250 7.2 5.8 98.19 29.6 49.7 79.4
    10% Ni(O) A 250 12.6 4.8 98.74 22.6 60.3 82.9
  • TABLE 12
    Catalyst Cat. Temp. Contact Time H2/CFC-217 % Selectivity
    Precursor Prep. (° C.) (sec) Mole Ratio % Conversion HFP HFC-227 Total
    10% Nickel B 200 11.7 7.4 60.73 51.9 38.9 90.8
    acetylacetonate
    10% Nickel B 250 10.8 9.3 69.64 57.8 21.1 78.8
    acetylacetonate
    10% Nickel B 300 10.1 5.5 97.33 55.1 20.3 75.4
    acetylacetonate
  • TABLE 13
    % Selectivity
    Catalyst Cat. Temp. Contact Time H2/CFC-217 HFC-
    Precursor Prep. (° C.) (sec) Mole Ratio % Conversion HFP 227ea Total
    10% B 200 12 9.3 72.85 45.4 41.0 86.4
    Bis(tripheylphos-
    phine) nickel (11)
    bromide
    10% B 250 9.4 12.7 41.19 62.3 21.5 83.8
    Bis(tripheylphos-
    phine) nickel (11)
    bromide
    10% B 300 9.8 8.8 78.12 43.2 28.6 71.8
    Bis(tripheylphos-
    phine) nickel (11)
    bromide
  • TABLE 14
    % Selectivity
    Catalyst Cat. Temp. Cont. Time H2/CFC-216 % HFC- CFC- CFC-
    Precursor Prep. (° C.) (sec) Mole Ratio Conv. PFP 236fa 1215xc 226da
    10% NiCl2 C 250 10.7 10.3 56.6 5.91 nd 22.3 60.6
    10% NiCl2 C 350 8.2 12.5 100 46.3 16.0 nd 2.6
    • EXAMPLE 6 Nickel/Palladium Catalysts
  • TABLE 15
    Catalyst Cat. Temp. Contact Time H2/CFC-217 % Selectivity
    Precursor Prep. (° C.) (sec) Mole Ratio % Conversion HFP HFC-227 Total
    NiF2/Pd(O) (5% A 200 13.3 3.5 27.04 12.9 50.2 63.1
    Ni/0.5% Pd)
    NiF2/Pd(O) (5% A 250 11 10.7 82.65 12.6 70.7 83.3
    Ni/0.5% Pd)
    NiF2/Pd(O) (5% A 300 8.9 8.9 81.99 2.1 79.9 82.0
    Ni/0.5% Pd)
  • TABLE 16
    Catalyst Cat. Temp. Contact Time H2/CFC-217 % Selectivity
    Precursor Prep. (° C.) (sec) Mole Ratio % Conversion HFP HFC-227 Total
    NiF2/PdCl2 A 200 11.6 7.1 87.3 1.0 82.8 83.8
    (1.12%
    Ni/0.24% Pd)
    NiF2/PdCl2 A 250 10.8 9.4 72.48 7.1 74.3 81.4
    (1.12%
    Ni/0.24% Pd)
    NiF2/PdCl2 A 350 7.6 8.4 97.22 54.8 33.8 88.5
    (1.12%
    Ni/0.24% Pd)
    NiF2/PdCl2 A 350 9.1 9.6 76.1 43.1 41.2 84.4
    (1.12%
    Ni/0.24% Pd)
    • EXAMPLE 7 Copper Catalyst
  • TABLE 17
    Catalyst Cat. Temp. Contact Time H2/CFC-217 % Selectivity
    Precursor Prep. (° C.) (sec) Mole Ratio % Conversion HFP HFC-227 Total
    10% CuCl A 200 11 5.0 34.27 40.0 55.7 95.6
    10% CuCl A 250 8.3 2.2 39.63 57.3 37.2 94.5
  • TABLE 18
    Catalyst Cat. Temp. Contact Time H2/CFC-217 % Selectivity
    Precursor Prep. (° C.) (sec) Mole Ratio % Conversion HFP HFC-227 Total
    10% CuF2 D 200 6.6 9.3 26.34 41.8 43.1 84.9
    10% CuF2 D 250 5.8 6.6 56.18 14.0 77.8 91.8
    10% CuF2 D 300 5.3 7 90.72 47.5 46.6 94.1
    10% CuF2 D 300 5 7.5 31.48 71.8 24.6 96.4
    10% CuF2 D 300 5.1 8.5 58.09 60.5 36.4 96.9
    • EXAMPLE 8 Copper/Palladium Catalysts
  • TABLE 19
    Catalyst Cat. Temp. Contact Time H2/CFC-217 % Selectivity
    Precursor Prep. (° C.) (sec) Mole Ratio % Conversion HFP HFC-227 Total
    CuF2/PdCl2(5.51% A 250 10.2 12.8 49.86 28.9 69.4 98.3
    Cu/0.42% Pd)
    CuF2/PdCl2(5.51% A 250 10.2 12.8 94.98 30.2 68.6 98.8
    Cu/0.42% Pd)
    CuF2/PdCl2(5.51% A 250 14 13/4 97.3 33.0 66.0 99.0
    Cu/0.42% Pd)
    CuF2/PdCl2(5.51% A 250 12.9 6.2 69.05 29.5 69.2 98.6
    Cu/0.42% Pd)
    CuF2/PdCl2(5.51% A 300 11.1 4.4 94.94 33.2 64.9 98.1
    Cu/0.42% Pd)
    CuF2/PdCl2(5.51% A 300 8.2 5.4 92.8 38.7 59.8 98.5
    Cu/0.42% Pd)
  • TABLE 20
    Catalyst Cat. Temp. Contact Time H2/CFC-217 % Selectivity
    Precursor Prep. (° C.) (sec) Mole Ratio % Conversion HFP HFC-227 Total
    CuF2/PdCl2(11.01% A 200 10.4 7.4 42.1 35.6 62.0 97.6
    Cu/0.65% Pd)
    CuF2/PdCl2(11.01% A 250 10.9 6.8 96.23 38.9 59.2 98.2
    Cu/0.65% Pd)
    CuF2/PdCl2(11.01% A 250 9.5 8.6 98.37 37.0 61.8 98.8
    Cu/0.65% Pd)
  • TABLE 21
    Catalyst Cat. Temp. Contact Time H2/CFC-217 % Selectivity
    Precursor Prep. (° C.) (sec) Mole Ratio % Conversion HFP HFC-227 Total
    CuF2/PdCl2(5.51% A 200 11.8 8 73.36 22.4 72.1 94.6
    Cu/0.65% Pd)
    CuF2/PdCl2(5.51% A 250 11.8 8 97.79 35.0 63.7 98.6
    Cu/0.65% Pd)
    CuF2/PdCl2(5.51% A 250 12 9.4 97.3 40.61 58.03 98.6
    Cu/0.65% Pd)
    CuF2/PdCl2(5.51% A 250 12 9.2 98.23 41.4 57.5 98.9
    Cu/0.65% Pd)
  • TABLE 22
    % Selectivity
    Catalyst Cat. Temp. Contact Time H2/CFC-217 HFC-
    Precursor Prep. (° C.) (sec) Mole Ratio % Conversion HFP 227ea Total
    CuF2/PdCl2(5.51% D 250 11.4 6 99.24 32.5 64.6 97.1
    Cu/0.675% Pd)
    CuF2/PdCl2(5.51% D 250 11.4 13.9 93.42 33.6 65.8 99.4
    Cu/0.675% Pd)
    CuF2/PdCl2(5.51% D 250 12.5 15.1 99.23 33.1 47.3 30.4
    Cu/0.675% Pd)
    CuF2/PdCl2(5.51% D 250 6.19 7.8 33.13 31.8 63.0 94.8
    Cu/0.675% Pd)
  • TABLE 23
    Catalyst Cat. Temp. Contact Time H2/CFC-217 % Selectivity
    Precursor Prep. (° C.) (sec) Mole Ratio % Conversion HFP HFC-227 Total
    CuCl2/PdCl2(5.5% H 230 9.5 6 93.27 40.7 58.0 98.7
    Cu/0.6% Pd)
    CuCl2/PdCl2(5.5% H 230 9.5 6 90.04 43.9 55.0 98.8
    Cu/0.6% Pd)
    CuCl2/PdCl2(5.5% H 230 9.6 4.5 68.24 41.3 57.8 99.1
    Cu/0.6% Pd)
  • TABLE 24
    Catalyst Cat. Temp. Contact Time H2/CFC-217 % Selectivity
    Precursor Prep. (° C.) (sec) Mole Ratio % Conversion HFP HFC-227 Total
    CuCl2/PdCl2(5.5% F 200 15.1 15.5 98.98 30.4 68.1 98.4
    Cu/0.6% Pd)
    CuCl2/PdCl2(5.5% F 250 15.1 15.5 30.63 30.63 68.0 98.6
    Cu/0.6% Pd)
  • TABLE 25
    Catalyst Cat. Temp. Contact Time H2/CFC-217 % Selectivity
    Precursor Prep. (° C.) (sec) Mole Ratio % Conversion HFP HFC-227 Total
    CuCl2/PdCl2(5.5% F 275 9.5 4.4 94.38 43.8 49.0 92.9
    Cu/0.9% Pd)
    CuCl2/PdCl2(5.5% F 275 9.9 5.7 95.46 50.8 42.6 93.4
    Cu/0.9% Pd)
  • TABLE 26
    Catalyst Cat. Temp. Contact Time H2/CFC-217 % Selectivity
    Precursor Prep. (° C.) (sec) Mole Ratio % Conversion HFP HFC-227 Total
    CuCl2/PdCl2(2.0% A 200 27.8 5.3 97.66 0.9 76.2 77.1
    Cu/0.6% Pd)
    CuCl2/PdCl2(2.0% A 150 27.8 5.3 71.06 1.3 75.1 76.4
    Cu/0.6% Pd)
    CuCl2/PdCl2(2.0% A 100 27.8 5.3 34.54 2.8 69.7 72.4
    Cu/0.6% Pd)
    CuCl2/PdCl2(2.0% A 250 27.8 5.3 83.37 8.4 75.4 83.8
    Cu/0.6% Pd)
  • TABLE 27
    Catalyst Cat. Temp. Contact Time H2/CFC-217 % Selectivity
    Precursor Prep. (° C.) (sec) Mole Ratio % Conversion HFP HFC-227 Total
    CuCl2/PdCl2(5.5% C 200 9 5.2 53.58 29.3 69.4 98.7
    Cu/0.6% Pd)
    CuCl2/PdCl2(5.5% C 250 9.3 6.2 39.48 45.9 52.9 98.8
    Cu/0.6% Pd)
    CuCl2/PdCl2(5.5% C 230 9.7 3.6 72.3 44.4 54.6 99.0
    Cu/0.6% Pd)
    CuCl2/PdCl2(5.5% C 230 16 4.7 75.81 46.8 52.2 99.0
    Cu/0.6% Pd)
    CuCl2/PdCl2(5.5% C 230 21.8 3 30.54 36.1 62.9 99.0
    Cu/0.6% Pd)
    CuCl2/PdCl2(5.5% C 230 35.4 1.2 88.17 26.71 71.21 97.9
    Cu/0.6% Pd)
  • TABLE 28
    Catalyst Cat. Temp. Contact Time H2/CFC-217 % Selectivity
    Precursor Prep. (° C.) (sec) Mole Ratio % Conversion HFP HFC-227 Total
    CuF2/PdCl2(12.5% I 250 8.9 6.8 91.67 35.4 63.5 98.9
    Cu/1.4% Pd)
    CuF2/PdCl2(12.5% I 275 9.9 6.7 98.56 43.0 55.7 98.8
    Cu/1.4% Pd)
    CuF2/PdCl2(12.5% I 300 5.1 9.5 97.46 50.7 48.2 98.9
    Cu/1.4% Pd)
    CuF2/PdCl2(12.5% I 350 5 6.4 99.53 51.0 45.7 96.7
    Cu/1.4% Pd)
    CuF2/PdCl2(12.5% I 350 4 5.7 98.59 53.6 43.4 97.0
    Cu/1.4% Pd)
    CuF2/PdCl2(12.5% I 350 3 5.8 95.34 54.0 44.3 98.2
    Cu/1.4% Pd)
    CuF2/PdCl2(12.5% I 350 2 5.8 86.29 52.6 45.6 98.2
    Cu/1.4% Pd)
  • TABLE 29
    % Selectivity
    Catalyst Cat. Temp Cont. Time H2/CFC-216 % HFC- CFC- CFC-
    Precursor Prep. (° C.) (sec) Mole Ratio Conv. PFP 236fa 1215xc 226da
    CuCl2/PdCl2(5.5% C 100 11 11.8 99.9 38.6 28.6 28.6 nd
    Cu/0.2% Pd)
    CuCl2/PdCl2(5.5% C 125 8.6 8.1 91.6 26.0 16.4 19.2 34.9
    Cu/0.2% Pd)
    CuCl2/PdCl2(5.5% C 150 11.8 8.1 97.0 46.5 11.2 18.6 21.3
    Cu/0.2% Pd)
    CuCl2/PdCl2(5.5% C 175 11.8 8.1 98.5 58.2 6.7 20.3 12.8
    Cu/0.2% Pd)
    CuCl2/PdCl2(5.5% C 200 8.6 13 100 58.3 7.3 19.0 8.5
    Cu/0.2% Pd)
    CuCl2/PdCl2(5.5% C 270 6.8 12.2 100 27.7 12.4 36.4 20.2
    Cu/0.2% Pd)
    CuCl2/PdCl2(5.5% C 380 14.4 7.7 100 84.8 8.8 1.7 nd
    Cu/0.2% Pd)
    CuCl2/PdCl2(5.5% C 380 14.4 7.7 100 84.4 8.5 2.5 nd
    Cu/0.2% Pd)
    CuCl2/PdCl2(5.5% C 400 7.5 10.4 100 60.0 3.2 28.3 nd
    Cu/0.2% Pd)
    CuCl2/PdCl2(5.5% C 500 7.5 10.4 100 67.9 2.3 11.2 nd
    Cu/0.2% Pd)
    • EXAMPLE 9 Zinc Catalysts
  • TABLE 30
    Catalyst Cat. Temp. Contact Time H2/CFC-217 % Selectivity
    Precursor Prep. (° C.) (sec) Mole Ratio % Conversion HFP HFC-227 Total
    20% ZnCl2 A 300 12.8 6.4 100 46.46 46.46 92.92
    20% ZnCl2 A 300 12.46 5.33 99.39 42.58 50.26 92.84
    20% ZnCl2 A 300 12.33 4.57 74.38 39.54 51.64 91.18
    20% ZnCl2 A 450 18.54 4 84.06 48.26 40.63 88.89
    20% ZnCl2 A 450 14.37 5.5 83.83 24.11 55.02 79.13
    • EXAMPLE 10 Iron Catalysts
  • TABLE 31
    Catalyst Cat. Temp. Contact Time H2/CFC-217 % Selectivity
    Precursor Prep. (° C.) (sec) Mole Ratio % Conversion HFP HFC-227 Total
    10% FeCl3 A 500 5.87 3.62 81.06 41.65 45.11 86.76
    10% FeCl3 A 500 8.57 4.12 73.28 20.51 61.16 81.67
    10% FeCl3 A 500 7.67 10.5 93.39 40.44 42.23 82.67
    • EXAMPLE 11 Manganese Catalysts
  • TABLE 32
    Catalyst Cat. Temp. Contact Time H2/CFC-217 % Selectivity
    Precursor Prep. (° C.) (sec) Mole Ratio % Conversion HFP HFC-227 Total
    19% MnCl2 A 400 24.69 4.33 63.6 10.22 59.42 69.64
    19% MnCl2 A 450 22.21 3 24.99 5.16 62.1 67.26
    19% MnCl2 A 500 16.24 9.5 60.29 6.63 62.26 68.89
    • EXAMPLE 12 Cobalt Catalysts
  • TABLE 33
    Catalyst Cat. Temp. Contact Time H2/CFC-217 % Selectivity
    Precursor Prep. (° C.) (sec) Mole Ratio % Conversion HFP HFC-227 Total
    20% CoCl2 A 400 24.14 4.33 36.26 9.16 63.38 72.54
    20% CoCl2 A 500 16.69 9.5 99.05 38.99 34 72.99
    20% CoCl2 A 500 16.59 9.5 99.66 29.22 33.23 62.45
    20% CoCl2 A 500 14.36 3.8 69.14 10.67 69.51 80.18
    • EXAMPLE 13 Titanium Catalysts
  • TABLE 34
    Catalyst Cat. Temp Contact Time H2/CFC-217 % Selectivity
    Precursor Prep. (° C.) (sec) Mole Ratio % Conversion HFP HFC-227 Total
    20% bis(cyclopentadienyl)- B 200 12.12 4.22 2.66 17.67 6.39 24.06
    titanium dichloride
    20% bis(cyclopentadienyl)- B 300 12.34 4.57 12.54 38.52 38.52 77.04
    titanium dichloride
    20% bis(cyclopentadienyl)- B 400 24.25 4.33 42.72 17.09 38.95 56.04
    titanium dichloride
    20% bis(cyclopentadienyl)- B 450 21.71 2.4 30.28 13.97 50.56 64.53
    titanium dichloride
    20% bis(cyclopentadienyl)- B 500 16.39 9.5 98.21 14.8 53.99 38.79
    titanium dichloride
    20% bis(cyclopentadienyl)- B 500 16.34 9.5 91.48 30.05 34.9 64.95
    titanium dichloride
    • EXAMPLE 14 Reaction Pressure
  • TABLE 35
    Catalyst Cat. Temp. Pressure Contact H2/217 Conv. % Selectivity
    Precursor Prep. (C) (kg/cm2) Time (sec) Mole Ratio % HFP HFC-227 Total
    CuF2/PdCl2(11.01% I 250 1 9.5 8.6 98.4 37.0 61.8 98.8
    Cu/0.65% Pd)
    CuF2/PdCl2(12.5% I 275 1 10.4 6.7 97.8 40.1 58.9 99.0
    Cu/1.4% Pd)
    CuF2/PdCl2(12.5% I 300 1 9.9 6.7 99.9 46.7 50.4 97.1
    Cu/1.4% Pd)
    CuF2/PdCl2(12.5% I 350 1 3 5.8 95.3 54.0 44.3 98.2
    Cu/1.4% Pd)
    CuF2/PdCl2(5.5% I 250 1 8.9 5.3 91.3 36.2 59.7 95.9
    Cu/0.9% Pd)
    CuF2/PdCl2(5.5% I 300 1 9.1 4.2 91.5 50.0 44.9 94.9
    Cu/0.9% Pd)
    CuF2/PdCl2(5.5% I 300 8 9.8 7.2 74.5 21.8 75.0 96.8
    Cu/0.9% Pd)
    CuF2/PdCl2(5% I 350 8 3.8 4.9 42.6 28.0 70.5 98.4
    Cu/0.6% Pd)
    • EXAMPLE 15 With Diluent
  • TABLE 36
    Catalyst Cat. Temp. Pressure Contact Diluent:H2:217 Conv. % Selectivity
    Precursor Prep. (C) (kg/cm2) Time (sec) Diluent Mole Ratio % HFP 227 Total
    CuCl2/PdCl2(5% C 350 8.9 5.1 He 6:1:1.1:1 59.3 32.8 63.7 96.5
    Cu/0.6% Pd)
    CuCl2/PdCl2(5% C 350 6.1 16.7 He 2.3:0.38:1 56.7 26.4 68.5 94.9
    Cu/0.6% Pd)
    CuCl2/PdCl2(5% C 350 6.1 13.1 HFC-134 9.8:1.9:1 90.8 35.7 62.3 98
    Cu/0.6% Pd)
    CuCl2/PdCl2(5% C 350 6.4 10.8 HFC-227ea 14:2.5:1 99.3 19.2 78.5 97.7
    Cu/0.6% Pd)
    CuCl2/PdCl2(5% C 350 1 9.8 HFC-227ea 5.3:0.4:1 67.2 40.7 58.4 99.1
    Cu/0.6% Pd)
    CuCl2/PdCl2(5% C 350 1 9.3 HFC-227ea 4.4:1.9:1 50.8 42.9 55.7 98.5
    Cu/0.6% Pd)
  • In compliance with the statute, the invention has been described in language more or less specific as to structural and methodical features. It is to be understood, however, that the invention is not limited to the specific features shown and described, since the means herein disclosed comprise preferred forms of putting the invention into effect. The invention is, therefore, claimed in any of its forms or modifications within the proper scope of the appended claims appropriately interpreted in accordance with the doctrine of equivalents.

Claims (83)

1. A system for producing fluorocarbons comprising:
a reactant stream comprising a saturated halogenated fluorocarbon and hydrogen;
a reactor configured to bring the saturated halogenated fluorocarbon into reactive proximity with a catalyst, wherein the catalyst comprises Cu and Pd; and
a product stream comprising saturated and unsaturated fluorocarbons.
2. The system of claim 1 wherein the weight ratio of Cu to Pd is about 9:1.
3. The system of claim 1 wherein the saturated halogenated fluorocarbon comprises CF3CClFCF3.
4. The system of claim 1 wherein the saturated halogenated fluorocarbon comprises CF3CCl2CF3.
5. The system of claim 1 wherein the saturated fluorocarbon comprises one or more of CF3CFHCF3, CF3CH2CF3, and CF3CHClCF3.
6. The system of claim 1 wherein the unsaturated fluorocarbon comprises one or more of CF3CF═CF2, CF3CH═CF2, and CF3CCl═CF2.
7. A method for preparing fluorinated compounds comprising:
providing a reactant mixture comprising a C-3 saturated halogenated fluorocarbon and hydrogen; and
contacting said mixture with a catalyst comprising Pd and one or both of Ni and Cu to form a product mixture comprising a C-3 saturated hydrofluorocarbon and a C-3 unsaturated fluorocarbon.
8. The method of claim 7 wherein the C-3 saturated halogenated fluorocarbon comprises CF3CFClCF3.
9. The method of claim 7 wherein the C-3 saturated halogenated fluorocarbon consists essentially of CF3CFClCF3.
10. The method of claim 7 wherein the C-3 saturated halogenated fluorocarbon comprises CF3CCl2CF3.
11. The method of claim 7 wherein the C-3 saturated halogenated fluorocarbon consists essentially of CF3CCl2CF3.
12. The method of claim 7 wherein the contacting occurs at a temperature of from about 100° C. to about 500° C.
13. The method of claim 7 wherein the contacting occurs at a temperature of from about 200° C. to about 400° C.
14. The method of claim 7 wherein the contacting occurs at a temperature of from about 220° C. to about 350° C.
15. The method of claim 7 wherein the contacting occurs for from about 4 to about 75 seconds.
16. The method of claim 7 wherein the contacting occurs for from about 9 to about 55 seconds.
17. The method of claim 7 wherein the contacting occurs at a pressure from about 1 kg/cm2 to about 150 kg/cm2.
18. The method of claim 7 wherein the contacting occurs at a pressure from about 5 kg/cm2 to about 10 kg/cm2.
19. The method of claim 7 wherein a mole ratio of the hydrogen to the C-3 saturated halogenated fluorocarbon is from about 2.5:1 to about 20:1.
20. The method of claim 7 wherein the mole ratio of the hydrogen to the C-3 saturated halogenated fluorocarbon is from about 2:1 to about 10:1.
21. The method of claim 7 wherein the mole ratio of the hydrogen to the C-3 saturated halogenated fluorocarbon is from about 1:1 to about 5:1.
22. The method of claim 7 wherein the catalyst further comprises an activated carbon support.
23. The method of claim 7 wherein the catalyst comprises Cu and Pd.
24. The method of claim 7 wherein the catalyst consists essentially of Cu and Pd.
25. The method of claim 7 wherein the catalyst comprises Cu and Pd at a weight ratio of Cu to Pd of from about 3:1 to about 28:1.
26. The method of claim 7 wherein the catalyst comprises Cu and Pd at a weight ratio of Cu to Pd of about 9:1.
27. The method of claim 7 wherein the reactant mixture further comprises a diluent.
28. The method of claim 27 wherein the diluent comprises helium.
29. The method of claim 27 wherein the diluent comprises CF3CHFCF3.
30. The method of claim 29 wherein a mole ratio of diluent:hydrogen:C-3 saturated halogenated fluorocarbon is from about 2:0.6:1 to about 15:5:1.
31. The method of claim 29 wherein a mole ratio of diluent:hydrogen:C-3 saturated halogenated fluorocarbon is from about 3:1:1 to about 14:2.5:1.
32. The method of claim 7 wherein the product mixture comprises at least about 35% C-3 saturated hydrofluorocarbon.
33. The method of claim 7 wherein the product mixture comprises CF3CHFCF3 and CF3CF═CF2.
34. The method of claim 7 wherein the product mixture comprises one or more of CF3CH2CF3, CF3CHClCF3, CF3CH═CF2, and CF3CCl═CF2.
35. The method of claim 7 wherein the product mixture comprises one or more of CF3CF═CF2, CF3CH═CF2, and CF3CCl═CF2
36. A method for preparing fluorinated compounds comprising contacting CF3CCl2CF3 with hydrogen in the presence of a catalyst to produce a mixture comprising one or more of CF3CH2CF3, CF3CHClCF3, CF3CH═CF2, and CF3CCl═CF2.
37. The method of claim 36 wherein the contacting occurs at a temperature of from about 100° C. to about 500° C.
38. The method of claim 36 wherein the contacting occurs for from about 6 to about 30 seconds.
39. The method of claim 36 wherein the contacting occurs for from about 10 to about 15 seconds.
40. The method of claim 36 wherein the contacting occurs at a pressure from about 1 kg/cm2 to about 150 kg/cm2.
41. The method of claim 36 wherein the contacting occurs at a pressure from about 1 kg/cm2 to about 10 kg/cm2.
42. The method of claim 36 wherein a mole ratio of the hydrogen to the CF3CCl2CF3 is from about 1:1 to about 15:1.
43. The method of claim 36 wherein a mole ratio of the hydrogen to the CF3CCl2CF3 is from about 2:1 to about 10:1.
44. The method of claim 36 wherein the catalyst further comprises an activated carbon support.
45. The method of claim 36 wherein the catalyst comprises Cu and Pd.
46. The method of claim 36 wherein the catalyst consists essentially of Cu and Pd.
47. The method of claim 36 wherein the catalyst comprises Cu and Pd at a weight ratio of Cu to Pd of from about 8:1 to about 28:1.
48. The method of claim 36 wherein the catalyst comprises Cu and Pd at a weight ratio of Cu to Pd of about 9:1.
49. A method for preparing fluorinated compounds comprising:
providing a reactant mixture comprising a C-3 saturated halogenated fluorocarbon and hydrogen; and
contacting the reactant mixture with a catalyst comprising one or more of K, Zr, Ni, Cu, Zn, W, Fe, Mn, Co, Ti, and Pd to form a product mixture comprising a C-3 unsaturated fluorocarbon and a C-3 saturated hydrofluorocarbon, wherein the C-3 saturated hydrofluorocarbon comprises at least about 35% of the mixture.
50. The method of claim 49 wherein the C-3 saturated halogenated fluorocarbon comprises one or more of CF3CFClCF3 and CF3CCl2CF3.
51. The method of claim 49 wherein the contacting occurs at a temperature of from about 100° C. to about 500° C.
52. The method of claim 49 wherein the contacting occurs at a pressure from about 1 kg/cm2 to about 150 kg/cm2.
53. The method of claim 49 wherein a mole ratio of the hydrogen to the C-3 saturated halogenated fluorocarbon is from about 1:1 to about 20:1.
54. The method of claim 49 wherein the catalyst further comprises an activated carbon support.
55. The method of claim 49 wherein the catalyst comprises Cu and Pd.
56. The method of claim 49 wherein the catalyst comprises Cu and Pd at a weight ratio of Cu to Pd of from about 3:1 to about 28:1.
57. The method of claim 49 wherein the reactant mixture comprises a diluent.
58. The method of claim 57 wherein the diluent comprises one or more of CF3CHFCF3 and CF3CH2F.
59. The method of claim 58 wherein a mole ratio of diluent:hydrogen:C-3 saturated halogenated fluorocarbon is from about 2:0.6:1 to about 15:5:1.
60. The method of claim 49 wherein the C-3 saturated hydrofluorocarbon comprises one or more of CF3CHFCF3, CF3CH2CF3, and CF3CHClCF3.
61. The method of claim 49 wherein the C-3 unsaturated fluorocarbon comprises one or more of CF3CF═CF2, CF3CH═CF2, and CF3CCl═CF2.
62. A method for producing fluorocarbons comprising:
providing a reactant mixture comprising CF3CClFCF3 and hydrogen; and
contacting the reactant mixture with a catalyst system for from about 9 to about 55 seconds at a pressure of from about 1.0 kg/cm2 to about 10 kg/cm2 at a temperature of from about 220° C. to about 350° C. to form a product mixture comprising CF3CHFCF3 and CF3CF═CF2, the catalyst system comprising Cu, Pd, and activated carbon, wherein the weight ratio of Cu to Pd is about 9:1.
63. The method of claim 62 wherein a mole ratio of the hydrogen to the CF3CClFCF3 is from about 1:1 to about 20:1.
64. The method of claim 62 wherein the reactant mixture further comprises a diluent.
65. The method of claim 64 wherein the diluent comprises CF3CHFCF3.
66. The method of claim 65 wherein a mole ratio of diluent:hydrogen: CF3CClFCF3 is from about 2:0.6:1 to about 15:2.5:1.
67. The method of claim 62 wherein the product mixture comprises at least about 35% CF3CHFCF3.
68. A method for preparing fluorinated compounds comprising:
providing a reactant mixture comprising a saturated fluorocarbon and hydrogen; and
contacting said mixture with a catalyst to form a product mixture comprising a saturated hydrofluorocarbon and a unsaturated fluorocarbon, wherein the contacting occurs at a pressure of from about 3 kg/cm2 to about 8 kg/cm2.
69. The method of claim 68 wherein the saturated fluorocarbon comprises CF3CFClCF3.
70. The method of claim 68 wherein the saturated fluorocarbon comprises CF3CCl2CF3.
71. The method of claim 68 wherein the contacting occurs at a temperature of from about 100° C. to about 500° C.
72. The method of claim 68 wherein the contacting occurs for from about 4 to about 75 seconds.
73. The method of claim 68 wherein a mole ratio of the hydrogen to the saturated fluorocarbon is from about 1:1 to about 20:1.
74. The method of claim 68 wherein the catalyst comprises an activated carbon support.
75. The method of claim 68 wherein the catalyst comprises Cu and Pd.
76. The method of claim 68 wherein the catalyst comprises Cu and Pd at a weight ratio of Cu to Pd of from about 3:1 to about 28:1.
77. The method of claim 68 wherein the reactant mixture further comprises a diluent.
78. The method of claim 77 wherein the diluent comprises helium.
79. The method of claim 77 wherein the diluent comprises CF3CHFCF3.
80. The method of claim 78 wherein a mole ratio of diluent:hydrogen:saturated fluorocarbon is from about 2:0.6:1 to about 15:5:1.
81. The method of claim 68 wherein the product mixture comprises at least about 35% saturated hydrofluorocarbon.
82. The method of claim 68 wherein the product mixture comprises CF3CHFCF3 and CF3CF═CF2.
83. The method of claim 68 wherein the product mixture comprises one or more of CF3CH2CF3, CF3CHClCF3, CF3CH═CF2, and CF3CCl═CF2.
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US7368089B2 (en) 2008-05-06
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