US20080302733A1 - Coupling agent-reacted mercury removal media - Google Patents
Coupling agent-reacted mercury removal media Download PDFInfo
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- US20080302733A1 US20080302733A1 US12/116,383 US11638308A US2008302733A1 US 20080302733 A1 US20080302733 A1 US 20080302733A1 US 11638308 A US11638308 A US 11638308A US 2008302733 A1 US2008302733 A1 US 2008302733A1
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/64—Heavy metals or compounds thereof, e.g. mercury
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/12—Naturally occurring clays or bleaching earth
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
- B01J20/3202—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the carrier, support or substrate used for impregnation or coating
- B01J20/3204—Inorganic carriers, supports or substrates
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
- B01J20/3231—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the coating or impregnating layer
- B01J20/3242—Layers with a functional group, e.g. an affinity material, a ligand, a reactant or a complexing group
- B01J20/3244—Non-macromolecular compounds
- B01J20/3246—Non-macromolecular compounds having a well defined chemical structure
- B01J20/3248—Non-macromolecular compounds having a well defined chemical structure the functional group or the linking, spacer or anchoring group as a whole comprising at least one type of heteroatom selected from a nitrogen, oxygen or sulfur, these atoms not being part of the carrier as such
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
- B01J20/3231—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the coating or impregnating layer
- B01J20/3242—Layers with a functional group, e.g. an affinity material, a ligand, a reactant or a complexing group
- B01J20/3244—Non-macromolecular compounds
- B01J20/3246—Non-macromolecular compounds having a well defined chemical structure
- B01J20/3257—Non-macromolecular compounds having a well defined chemical structure the functional group or the linking, spacer or anchoring group as a whole comprising at least one of the heteroatoms nitrogen, oxygen or sulfur together with at least one silicon atom, these atoms not being part of the carrier as such
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/288—Treatment of water, waste water, or sewage by sorption using composite sorbents, e.g. coated, impregnated, multi-layered
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/106—Silica or silicates
- B01D2253/11—Clays
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/60—Heavy metals or heavy metal compounds
- B01D2257/602—Mercury or mercury compounds
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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
- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/50—Aspects relating to the use of sorbent or filter aid materials
- B01J2220/58—Use in a single column
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/103—Arsenic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
Definitions
- the present invention is directed to compositions; methods of manufacturing the compositions; and methods of using the compositions for removing mercury (organic mercury, Hg, Hg+; and/or Hg+2) and/or arsenic (As+3 and/or As+5) from any contaminated water; and/or gas stream, e.g., natural gas; industrial smoke stacks; and the like.
- mercury organic mercury, Hg, Hg+; and/or Hg+2
- arsenic As+3 and/or As+5
- compositions also identified herein as “media,” or “mercury removal media,” or “Hg/As removal media” or “arsenic removal media,” can be used to remove mercury and/or arsenic from any water source and is particularly useful for removal of mercury and/or arsenic from drinking water; industrial wastewater; contaminated groundwater; contaminated sediment; offshore produced water so that the produced water can be returned to the ocean; and for removal of mercury from aqueous mining wastes.
- the mercury removal media comprises a homogeneous, preferably extruded composition comprising a layered phyllosilicate coupled to a coupling agent containing a mercapto or sulfide reactant group, and an organic phyllosilicate surface-treating agent, preferably an onium cation, resulting in an organoclay containing sulfur.
- the coupling agent is bonded to the organoclay chemically, physically, or by a combination of chemical and physical mechanisms.
- Mercury and arsenic contaminants are found in water, and mercury is found in both water and gases primarily from volcanic eruptions; coal fired power plants; emissions from coal combustion; mercury vapor and/or particles from natural gas; produced water from the oil and gas industry; waste waters from gold production and non-ferrous metal production (e.g., smelters); waste water from cement production; sewage sludge incineration; caustic soda production; pig iron and steel production; and mercury production waste, mainly for battery incorporation.
- Products containing mercury include: auto parts, batteries, fluorescent bulbs, medical products, thermometers, and thermostats.
- the Hg/As removal media described herein has a similar physical form to the organoclays used for organic contaminant removal and can be similarly packed in a canister or cartridge, as described in the above-listed patents.
- the Hg/As removal media described herein can be deployed in single layer or multi-layer water-permeable mats, as described in this assignee's published application Ser. Nos. 10/718,128, filed Nov. 19, 2003 (Publication No. 2005-01013707 A1), Ser. No. 11/221,019, filed Sep. 7, 2005 (Publication No. 2006/0000767 A1), [Ser. No. 11/489,383, filed Jul. 19, 2006, (Publication No. 2006-0286888 A1)], Ser. No.
- Hg/As removal media is based on organoclay technology but it has been substantially modified using several unique chemistries to enhance adsorption of mercury and arsenic-containing compounds.
- the mechanism of mercury adsorption is based upon chemical bonding, ionic bonding, mechanical bonding, or a combination thereof.
- the mercury and/or arsenic will be bonded to the media's external and internal surfaces and the bonding process is non-reversible.
- the Hg/As removal media described herein is effective on all sources of mercury and arsenic including organic types of mercury and arsenic, including organic mercury and arsenic compounds; mercury metal (zero valent); arsenite and arsenate compounds, arsenic ions (both III and V valent) and mercury ions (both I and II valent).
- organic-based mercury and/or arsenic is involved, the adsorption mechanism of partition could be involved in addition to chemical bonding.
- the Hg/As removal media described herein also is effective to remove oil, grease and other organic contaminant molecules. The media will be spent eventually when all of the adsorption sites are saturated. The actual media life will depend on the contaminated water compositions and the field operation conditions.
- Greco U.S. Pat. No. 5,512,526 describes a clay-based heavy metal removal media prepared by reacting a fatty mercaptan, e.g., dodecylmercaptan, with a fatty alkyl-containing quaternary ammonium compound. As described, the mercaptan's hydrophobic fatty alkyl group associates in some manner with the fatty alkyl group of the quaternary ammonium compound.
- a fatty mercaptan e.g., dodecylmercaptan
- a coupling agent containing a mercapto, disulfide, tretrasulfide and/or other polysulfide functional group provides a mercury and/or arsenic removal media having increased reactivity, stability, and mercury and/or arsenic removal ability.
- the Hg/As removal media described herein is prepared by reacting an organophilic clay, preferably containing onium ions, with a mercapto, disulfide, tetrasulfide, and/or polysulfide moiety.
- the clay can be made organophilic by treating a clay with a surface-treating agent, such as a polymer capable of increasing the d-spacing of the clay platelets, or, preferably, with onium ions prior to or simultaneously with the coupling reaction of the mercapto- or sulfide moiety-containing coupling agent.
- a surface-treating agent such as a polymer capable of increasing the d-spacing of the clay platelets, or, preferably, with onium ions prior to or simultaneously with the coupling reaction of the mercapto- or sulfide moiety-containing coupling agent.
- FIGS. 1-3 are graphs showing the mercury removal efficacy of the media described in the examples.
- FIG. 4 is a side view of an offshore oil well drilling platform generally showing the Hg/As removal media held within a canister attached to an offshore oil well drilling platform support structure with an alternative placement of a sump tank;
- FIG. 5 is a sectional view of an embodiment of a vessel containing a plurality of Hg/As removal media-containing cartridges or canisters for efficient removal of mercury and arsenic contained in water;
- FIG. 6 is an elevational view of a preferred embodiment of a vessel containing a plurality of Hg/As removal media-containing cartridges or canisters;
- FIG. 7 is a top plan view of the header of the vessel shown in FIG. 6 and openings within the header for receiving permeable conduits each of which can extend through a stack of cartridges or canisters as shown in FIGS. 5 and 6 ;
- FIG. 8 is a partially broken-away side view of an embodiment of a Hg/As removal media-containing vessel, containing multiple, stacked cartridges ( FIGS. 5 and 6 ).
- the invention is useful for mercury and arsenic removal from any contaminated water, including drinking water; industrial wastewaters; contaminated ground water supplies; aqueous mining wastes; and contaminated underwater and soil sediments, particularly when contained in a reactive mat, as described in the applications identified in paragraph [0003], or when used in bulk form.
- the Hg/As removal media described herein is a mercapto- or sulfide-containing layered organophilic phyllosilicate that is (or has been) made organophilic by reaction with an organic phyllosilicate surface-treating agent, preferably an onium ion-liberating compound, and has been made mercury-reactive and arsenic-reactive by bonding a mercapto- or sulfide-containing coupling agent to the phyllosilicate platelets.
- an organic phyllosilicate surface-treating agent preferably an onium ion-liberating compound
- the phyllosilicate can be a smectite clay, e.g., bentonite, montmorillonite, hectorite, beidellite, saponite, nontronite, volkonskoite, sauconite, stevensite, and/or a synthetic smectite derivative, particularly fluorohectorite and laponite; a mixed layered clay, particularly rectorite and their synthetic derivatives; vermiculite, illite, micaceous minerals, and their synthetic derivatives; layered hydrated crystalline polysilicates, particularly makatite, kanemite, octasilicate (illierite), magadiite and/or kenyaite; attapulgite, palygorskite, sepoilite; or any combination thereof.
- a smectite clay e.g., bentonite, montmorillonite, hectorite, beidellite,
- the surface modification (intercalant) agents used for organoclay formation include but are not limited to primary amine, secondary amine, tertiary amine, and onium ions and/or onium salt compounds, polyquat, polyamine, cationic polymers and their derivatives, nonionic polymers, and mixtures of thereof.
- the surface modification agent e.g., onium ion
- a solid or liquid composition nitrogen or aqueous, with or without an organic solvent, e.g., isopropanol and/or ethanol, if necessary to aid in dissolving the onium ion compound
- a surface modification e.g., onium ion concentration sufficient to provide a concentration of about 5% to about 10% by weight clay (90-95% water) and the surface modification agent, e.g., onium ion compound, is added to the clay slurry water, preferably at a molar ratio of onium ions to exchangeable interlayer cations of at least about 0.5:1, more preferably at least about 1:1.
- the onium ion-intercalated clay then is separated from the water easily, since the clay is now hydrophobic, and dried in an oven to less than about 5% water, preferably bone dry.
- the onium ion surface modification agent compound or polymer can be added as a solid with the addition to the layered material surface modification agent blend of preferably about 20% to about 40% water and/or organic solvent, more preferably at least about 30% water or more, based on the dry weight of layered material.
- a dry process can be described, as follows, for organoclay media preparation or manufacturing.
- the powder form of clay mineral is fed into a mixer through a major port for solids, typically an extruder.
- a separate port for the 2 nd powder form of solid can also be used besides the clay feeding port.
- the liquid forms of the additives including water, intercalant agent, and the coupling agent if any, are fed into the mixer through the separate ports. Either multiple forms of the solids or the liquids could be pre-mixed, or both the solids and the liquids can be pre-mixed through a separate mixer, before they are fed into the extender.
- a preferred liquid weight is from 10% to 50% based on the total mixture weight, more preferably from 20% to 40%, most preferably from 25% to 35%.
- the intimate mixture from the extruder will be further dried through a dryer, and be ground to the preferred particle size.
- a screening process could be used to collect the finished product in the desired particle size distribution.
- the onium ions may generally be represented by the following formula:
- the preferred phyllosilicate surface-treating agent is one or more onium ion salt compounds, generally represented by the following formula:
- R 1 , R 2 , R 3 and R 4 are independently organic moieties, or oligomeric moieties or hydrogen.
- useful organic moieties include, but not limited to, linear or branched alkyl, benzyl, aryl or aralkyl moieties having 1 to about 24 carbon atoms.
- Additional phyllosilicate surface-treating agents include the materials set forth below in paragraphs [0024] to [0030].
- the onium ions may be functionalized such as protonated ⁇ , ⁇ -amino acid with the general formula (H 3 N—(CH 2 ) n —COOH) + .
- Examples of the preferred silane coupling agents containing a mercapto, disulfide, tetrasulfide, or polysulfide reactant group include, for example, 3-Mercaptopropyltrimethoxysilane; 3-Mercaptopropyltriethoxysilane; 3-Mercaptopropylmethyldimethoxysilane; (Mercaptomethyl)dimethylethoxysilane; (Mercaptomethyl)methyldiethoxysilane; 11-mercaptoundecyltrimethoxysilane; Bis[3-(triethoxysilyl)propyl]-tetrasulfide; Bis[3-(triethoxysilyl)propyl]-disulfide; Bis-[m-(2-triethoxysily)lethyl)tolyl]-polysulfide; and mixtures thereof.
- the Hg/As removal media described herein can be used after the use of an organoclay for removal of organics in order to protect and extend the active life of both the organoclay, in an initial organoclay stage, and the Hg/As removal media, used after organic contaminant removal.
- a carbon media can also be used before or after the Hg/As removal media, if necessary.
- the retention time of contact between Hg/As-contaminated water and the Hg/As removal media should be no less than about 10 seconds, preferably at least about 1 minute, more preferably about 2 minutes or more.
- the preferred amounts of components that form the coupling agent-reacted organoclay Hg/As removal media are as follows, in percent by weight of product (media):
- Phyllosilicate Intercalant Agent Coupling Agent Preferably 1-90 10-50 0.5-50 More Preferably 35-83 15-45 2-20 More Preferably 50-77 20-40 2-12 More Preferably 59-71 25-35 5-9 Most Preferably 65 28 7
- the particle size of the organophilic clay is fine enough that at least 80% by weight of the clay particles pass through a 20 mesh screen, U.S. Sieve Series; more preferably at least 80% by weight of the clay particles pass through a 100 mesh screen, U.S. Sieve Series; and most preferably at least 80% of the clay particles pass through a 140 mesh screen, U.S. Sieve Series.
- the preferred sulfur particles have a particles size such that at least 80% by weight of the particles pass through an 18 mesh screen, U.S. Sieve Series; more preferably at least 80% by weight of the sulfur particles pass through at 50 mesh screen, U.S. Sieve Series; even more preferably at least 80% by weight of the sulfur particles pass through an 80 mesh screen, U.S. Sieve Series; and most preferably, at least 80% of the sulfur particles pass through a 100 mesh screen, U.S. Sieve Series.
- the final product formed should have a particle size such that at least 80% by weight of the particles pass through a 4 mesh (5 mm) screen; preferably at least 80% of the product particles should be smaller than 3 mm; and more preferably at least 80% by weight the product particles should be smaller than 2 mm.
- the preferred particle size range for the product particles is such that at least 80% by weight of the product particles are sized between 18 and 50 mesh, U.S. Sieve Series; more preferably at least 80% by weight of the product particles are sized between 10 mesh and 30 mesh, U.S. Sieve Series; even more preferably, at least 80% by weight of the product particles are sized between 8 and 40 mesh, U.S. Sieve Series; and most preferably, at least 80% by weight of the product particles are sized between 6 and 18 mesh, U.S. Sieve Series.
- the influent was composed of ⁇ 10 ppm of Hg(NO 3 ) 2 solution with dilute nitric acid matrix.
- the effluent samples were taken at regular intervals and the mercury content was measured by an ICP analytical test.
- the flow rate was about 10 BV/hr using a 6-minute retention time.
- the effluent curve is shown in FIG. 1 .
- a commercial mercury removal media Hg/As of SME Associates, Houston, Tex.
- a mixture of 85-90% activated carbon and 10-15% sulfur was also included in this study for comparison purpose, as shown in FIG. 1 .
- a wet-process is also suitable as the process to make the mercury removal media described herein.
- silane agent (Silquest® A-189 from GE Silicones, gamma-Mercaptopropyltrimethoxysilane) was pre-mixed with 20.0 g of ethanol and 2.0 g of water. This fresh prepared solution was added to the above clay-water-quat mixture, and mixed for 5 minutes. This mixture was extruded three times using a laboratory-scale extruder with a die-plate, and the final extrudates were oven-dried at 85° C. to a moisture content of less than 5% by weight. The dried extrudates were ground and resulting particles between 18 and 40 mesh (US standard sieves) were collected and tested for their performance.
- silane agent Silquest® A-189 from GE Silicones, gamma-Mercaptopropyltrimethoxysilane
- This mixture was extruded three times using a laboratory-scale extruder with a die-plate, and the final extrudates were oven-dried at 85° C. to a moisture content of less than 5% by weight.
- the dried extrudates were ground and resulting particles between 18 and 40 mesh (US standard sieves) were collected and tested for their performance.
- Example 1 The media material collected in Example 1 was packed in a column with an inner diameter of 1.5′′ and having an empty bed volume (BV) of ⁇ 92 mL.
- the influent was composed of ⁇ 10 ppm of Hg(II) in the presence of nitric acid.
- the effluent samples were taken at regular intervals and the mercury content was measured by the Inductively Coupled Plasma (ICP) analytical technique.
- the flow rate was about 10 BV/hr with a 6-minute retention time.
- the effluent data is plotted in FIG. 1 .
- a commercial organoclay media is also included in this study for the comparison purpose.
- Example 2 A column test was conducted on the organoclay media collected in Example 2.
- the influent was composed of ⁇ 10 ppm of Hg(II) and ⁇ 8 ppm of mechanical emulsified motor oil.
- the oil concentration in influent and effluent was characterized by Total Oil & Grease (TOG) analytical test. Throughout the test, the TOG for effluent was maintained at 0 ppm.
- the effluent results on mercury were plotted in FIG. 2 .
- Example 2 A column test was conducted on the organoclay media collected in Example 2. The influent was composed of 224 ppb of Hg(II). The effluent samples were taken at 9.4, 18.9, 28.3 Bed Volume intervals and their mercury concentration were 1.2 ppb, 0.8 ppb and 0.3 ppb, respectively. The mercury measurement tests were conducted by Test America (Buffalo Grove, Ill.) using EPA 245.2 test method.
- Bentonite powder was fed into a 5′′ Readco continuous processor at a feed rate of 600 lb/hr. About 0.40 gallon/minute of water and 0.78 gallon/minute of combined mixture of quat and silane coupling agent were also fed in the Readco processor through two independent ports in sequence.
- the mixed ratio between the quat (ARQUAD® 2HT from Akzo Nobel, bis(hydrogenated tallow alkyl)dimethyl ammonium chloride, ⁇ 83% active) and the silane coupling agent (Silquest® A-189 from GE Silicones, gamma-Mercaptopropyltrimethoxysilane) was abut 82.6:17.4 by weight.
- the discharged extrudates from the processor were sent to a dryer, the dried extrudates were further milled and the granular particles between 18 and 40 mesh with a moisture content less than 5% by weight were colleted as the finished product.
- Example 4 A similar column test as described in Example 4 was conducted on the product sample collected in Example 9. The effluent testing results are plotted in FIG. 3 .
- the Hg/As removal media described in Example 9 was tested under offshore platform conditions using the actual offshore mercury contaminated water.
- a commercially available organoclay product, CrudeSorbTM was also used in front of this Hg/As removal media.
- the influent had a mercury concentration of 37.7 ppb, and the effluent was 2.8 and 4.2 ppb after the 30-minute and 90-minute treatment, respectively.
- Example 9 The media described in Example 9 was examined for its ability to remove arsenic.
- the media materials were packed in a column having an inner diameter of 1.5′′ and empty bed volume of ⁇ 86 mL.
- the influent solution was composed of ⁇ 5 ppm of As(V).
- the As(V) stock solution was prepared by dissolving Na 2 HAsO 4 .7H 2 O in the de-ionized water.
- the effluent samples were taken at regular intervals and the arsenic content was measured by the Inductively Coupled Plasma (ICP) analytical technique.
- the flow rate was around 10 BV/hr with 6-minute retention time.
- the average effluent concentration was 3 ppm for a 40% removal of arsenic by the media.
- Example 9 The media material described in Example 9 was tested under offshore platform conditions using the actual wastewater contaminated by both mercury and arsenic.
- the contaminated water was pumped through two columns in series. Each column had a diameter of 3′′ and held about 1.5 Liter of media ( ⁇ 1,125 grams).
- the first column was packed with the commercial available organoclay media, CrudeSorbTM, and the second column was packed the media material described in Example 9.
- the retention time was roughly equal to 5-minute.
- the influent had mercury and arsenic concentration of 37.7 ppb and 8.17 ppb, respectively.
- the effluent had mercury concentrations of 2.8 ppb and 4.2 ppb, arsenic concentrations of 5.70 ppb and 5.87 ppb, respectively. So a total mercury and arsenic removal efficiency of greater than 88% and 28% were achieved, respectively.
- the sulfur impregnated organoclay media and the coupling agent-reacted organoclay media were tested as a package using the actual wastewater contaminated by both mercury and arsenic species on an offshore platform.
- the contaminated water was pumped through two columns in a series operation. Each column had a diameter of 3′′ and held about 1.5 Liter of media ( ⁇ 1,125 grams).
- the first column was packed with the sulfur impregnated organoclay media as described in Example 3, and the second column was packed with the coupling agent-reacted organoclay media as described in Example 9.
- the retention time was roughly equal to 5-minute.
- the influent had mercury and arsenic concentration of 26.8 ppb and 10.68 ppb, respectively.
- the effluent had mercury and arsenic concentrations of 2.4 ppb and 2.15 ppb, respectively. So a total mercury and arsenic removal efficiency of greater than 91% and 79% were achieved, respectively.
- an offshore drilling platform generally designated by reference numeral 10 including a work deck support structure 12 for supporting a plurality of stacked work decks at a substantial height above an ocean water level 14 .
- the work decks commonly include a cellar deck 16 at a lowest work deck level, a second deck 18 located directly above the cellar deck 16 , a third deck 20 disposed directly above deck 18 , and a main deck 22 at an uppermost work deck level.
- a sump tank 24 has been connected to the drilling platform 10 at the cellar deck level 16 and rainwater, including entrained hydrocarbons, particularly oil, paraffins and surfactants have been directed from all deck levels, which are contained so that rainwater and entrained hydrocarbons do not spill over to the ocean, to drain by gravity into the sump tank 24 .
- entrained hydrocarbons particularly oil, paraffins and surfactants
- the apparatus and methods described herein function best, in offshore platform use, when the sump tank 24 A is disposed on or near a boat landing deck level 26 ( FIG. 4 ) of the offshore drilling platform 10 .
- the sump tank can also be disposed at an upper level, such as at reference numeral 24 in FIG. 4 .
- Mercury and/or arsenic from ocean water that is collected on the production decks 16 , 18 , 20 and 22 that may accumulate during dry weather on the inner surfaces of the conduit 28 and inner surfaces of sump tank 24 can be separated from the water that flows from the decks to the Hg/As removal media-containing cartridge 44 for recovery and separation in accordance with the apparatus and methods described herein.
- Water containing mercury and/or arsenic is conveyed via conduit 28 from the deck areas 16 , 18 , 20 and 22 along the platform infrastructure or support leg 12 down to the sump tank 24 or 24 A, preferably sump tank 24 A for convenient servicing and/or Hg/As removal media cartridge replacement.
- the sump tank 24 or 24 A preferably sump tank 24 A for convenient servicing and/or Hg/As removal media cartridge replacement.
- a downwardly extending leg portion 42 of water leg 34 is operatively interconnected to, and in fluid communication with, one or more mercury and/or arsenic media-containing vessels 44 .
- the mercury removal media within vessel 44 captures the mercury and thereby separates essentially all mercury from the water (less than about 10 parts per million, preferably less than about 1 part per million mercury remains).
- the treated water flows through the liquid-permeable covers 76 of the cartridges 55 into the vessel 44 .
- the treated water then flows by gravity through water exit opening 46 in the water and coalesced hydrocarbon collection vessel 44 and through exit conduit 48 back to the ocean water 14 .
- vessel 44 includes an outer, fluid-impermeable housing 48 having a water inlet 42 interconnected through the housing 48 so that mercury-contaminated water enters vessel 44 and then flows through the HG/As removal media-containing cartridges 55 , through a plurality of longitudinal, axial, central inlet conduits 56 , 56 A, 56 B, 56 C and 56 D that may form part of a header, described in more detail hereinafter.
- the mercury removal media-containing cartridges 55 are water-permeable by virtue of flow apertures 57 , in the cartridge cover 76 , that are sized sufficiently small such that the mercury removal media does not pass therethrough.
- the purified water flows through the openings 57 in each liquid permeable cartridge cover 76 and collect in vessel 44 .
- FIG. 6 another embodiment of a vessel 100 is shown containing stacks of cartridges, one of which is shown at 102 .
- Each cartridge stack includes a plurality of annular cartridges 104 through which a porous contaminated liquid inlet conduit 106 extends.
- the porous inlet conduit 106 is connected to a header 108 which is disposed within a bottom section 110 of the vessel 100 , similar to the contaminated water inlet conduits 56 , 56 A, 56 B, 56 C and 56 D shown in FIG. 5 .
- the header 108 is connected to a mercury-contaminated water inlet 112 which includes a flange 114 which is connected to the flange 116 of the header 108 by a plurality of fasteners, such as bolts (not shown).
- the header is also supported within the bottom structure 110 (see FIG. 6 ) of the vessel by a plurality of supports shown at 118 .
- the header 108 includes a plurality of openings 120 , each of which receives a permeable conduit 106 (see FIG. 6 ).
- the header 108 is connected to 23 permeable conduits and therefore supports 23 stacks 102 of cartridges 104 .
- a permeable tube sheet 111 shown in FIG. 5 is not needed for collecting solids and the bottom section 110 of the vessel can be used to collect accumulated solids, or solids which do not pass through the outer covers 76 of the filter cartridges 104 .
- a drain 122 is provided for purposes of flushing out the accumulated solids which settle in the bottom structure 110 of the vessel 100 , together with the clean water.
- the clean water can be passed through a solids filter 123 before being directed to the ocean through conduit 125 .
- solids will accumulate on top of the tube sheet 111 .
- the solids must be removed from above the tube sheet 108 using one or more nozzle openings shown at 109 in FIG. 5 . As shown in FIG. 6 , these additional nozzle openings are not required in the vessel 100 because the accumulated solids are easily flushed down the drain pipe 122 into solids filter 123 .
- the header 108 As shown in FIG. 6 , an extremely dense number of stacks of cartridges 104 is provided by the header 108 .
- the header 108 as shown in FIG. 7 , includes 23 openings 120 , and therefore 23 porous conduits 106 and therefore 23 stacks 102 of cartridges 104 . Accordingly, the volumetric flow rate that can be handled by the vessel 100 is substantially greater than the volumetric flow rate that can be handled by the vessel 44 .
- smaller vessels with fewer stacks of cartridges and large vessels with more stacks of cartridges are anticipated.
Abstract
The use of a coupling agent containing a mercapto, disulfide, tretrasulfide and/or polysulfide end group provides a mercury removal media having increased reactivity, stability, and mercury removal ability. The mercury removal media described herein is prepared by reacting an organophilic clay containing onium ions with a mercapto, disulfide, tetrasulfide, and/or polysulfide end moiety. Alternatively, the clay can be made organophilic by onium ion reaction prior to or simultaneously with the coupling reaction of the mercapto- or sulfide-end group-containing coupling agent.
Description
- This application is a continuation-in-part of application Ser. No. 11/810,240 filed Jun. 5, 2007. The entire text of the priority application is incorporated herein by reference in its entirety.
- The present invention is directed to compositions; methods of manufacturing the compositions; and methods of using the compositions for removing mercury (organic mercury, Hg, Hg+; and/or Hg+2) and/or arsenic (As+3 and/or As+5) from any contaminated water; and/or gas stream, e.g., natural gas; industrial smoke stacks; and the like. The compositions, also identified herein as “media,” or “mercury removal media,” or “Hg/As removal media” or “arsenic removal media,” can be used to remove mercury and/or arsenic from any water source and is particularly useful for removal of mercury and/or arsenic from drinking water; industrial wastewater; contaminated groundwater; contaminated sediment; offshore produced water so that the produced water can be returned to the ocean; and for removal of mercury from aqueous mining wastes. The mercury removal media comprises a homogeneous, preferably extruded composition comprising a layered phyllosilicate coupled to a coupling agent containing a mercapto or sulfide reactant group, and an organic phyllosilicate surface-treating agent, preferably an onium cation, resulting in an organoclay containing sulfur. The coupling agent is bonded to the organoclay chemically, physically, or by a combination of chemical and physical mechanisms.
- Mercury and arsenic contaminants are found in water, and mercury is found in both water and gases primarily from volcanic eruptions; coal fired power plants; emissions from coal combustion; mercury vapor and/or particles from natural gas; produced water from the oil and gas industry; waste waters from gold production and non-ferrous metal production (e.g., smelters); waste water from cement production; sewage sludge incineration; caustic soda production; pig iron and steel production; and mercury production waste, mainly for battery incorporation. Products containing mercury include: auto parts, batteries, fluorescent bulbs, medical products, thermometers, and thermostats.
- The technologies available for mercury and arsenic removal, such as precipitation, coagulation/co-precipitation, activated carbon adsorption, ion-exchange and the like, are not sufficiently effective for mercury and arsenic (arsenite and arsenate compounds) removal. This assignee's organoclay has been proven effective on a variety of organic contaminants in the last decade. See, for example, this assignee's U.S. Pat. Nos. 6,398,951; 6,398,966; 6,409,924; and 6,749,757, incorporated herein by reference. A new Hg/As filtration media, described herein, can be operated in a similar fashion, or together with the organoclay media, but is much more effective for mercury and arsenic removal.
- The Hg/As removal media described herein has a similar physical form to the organoclays used for organic contaminant removal and can be similarly packed in a canister or cartridge, as described in the above-listed patents. In addition, the Hg/As removal media described herein can be deployed in single layer or multi-layer water-permeable mats, as described in this assignee's published application Ser. Nos. 10/718,128, filed Nov. 19, 2003 (Publication No. 2005-01013707 A1), Ser. No. 11/221,019, filed Sep. 7, 2005 (Publication No. 2006/0000767 A1), [Ser. No. 11/489,383, filed Jul. 19, 2006, (Publication No. 2006-0286888 A1)], Ser. No. 11/599,080, filed Nov. 14, 2006 (Publication No. 2007-0059542 A1); and Ser. No. 11/741,376, filed Apr. 27, 2007 (Publication No. 2007-0206994 A1), all of which are hereby incorporated by reference. Fundamentally, the Hg/As removal media is based on organoclay technology but it has been substantially modified using several unique chemistries to enhance adsorption of mercury and arsenic-containing compounds. The mechanism of mercury adsorption is based upon chemical bonding, ionic bonding, mechanical bonding, or a combination thereof. The mercury and/or arsenic will be bonded to the media's external and internal surfaces and the bonding process is non-reversible.
- The Hg/As removal media described herein is effective on all sources of mercury and arsenic including organic types of mercury and arsenic, including organic mercury and arsenic compounds; mercury metal (zero valent); arsenite and arsenate compounds, arsenic ions (both III and V valent) and mercury ions (both I and II valent). When the organic-based mercury and/or arsenic is involved, the adsorption mechanism of partition could be involved in addition to chemical bonding. In addition, the Hg/As removal media described herein also is effective to remove oil, grease and other organic contaminant molecules. The media will be spent eventually when all of the adsorption sites are saturated. The actual media life will depend on the contaminated water compositions and the field operation conditions.
- Greco U.S. Pat. No. 5,512,526 describes a clay-based heavy metal removal media prepared by reacting a fatty mercaptan, e.g., dodecylmercaptan, with a fatty alkyl-containing quaternary ammonium compound. As described, the mercaptan's hydrophobic fatty alkyl group associates in some manner with the fatty alkyl group of the quaternary ammonium compound.
- It has been found in accordance with the present invention that the use of a coupling agent containing a mercapto, disulfide, tretrasulfide and/or other polysulfide functional group provides a mercury and/or arsenic removal media having increased reactivity, stability, and mercury and/or arsenic removal ability. The Hg/As removal media described herein is prepared by reacting an organophilic clay, preferably containing onium ions, with a mercapto, disulfide, tetrasulfide, and/or polysulfide moiety. Alternatively, the clay can be made organophilic by treating a clay with a surface-treating agent, such as a polymer capable of increasing the d-spacing of the clay platelets, or, preferably, with onium ions prior to or simultaneously with the coupling reaction of the mercapto- or sulfide moiety-containing coupling agent.
-
FIGS. 1-3 are graphs showing the mercury removal efficacy of the media described in the examples; -
FIG. 4 is a side view of an offshore oil well drilling platform generally showing the Hg/As removal media held within a canister attached to an offshore oil well drilling platform support structure with an alternative placement of a sump tank; -
FIG. 5 is a sectional view of an embodiment of a vessel containing a plurality of Hg/As removal media-containing cartridges or canisters for efficient removal of mercury and arsenic contained in water; -
FIG. 6 is an elevational view of a preferred embodiment of a vessel containing a plurality of Hg/As removal media-containing cartridges or canisters; -
FIG. 7 is a top plan view of the header of the vessel shown inFIG. 6 and openings within the header for receiving permeable conduits each of which can extend through a stack of cartridges or canisters as shown inFIGS. 5 and 6 ; and -
FIG. 8 is a partially broken-away side view of an embodiment of a Hg/As removal media-containing vessel, containing multiple, stacked cartridges (FIGS. 5 and 6 ). - It should be understood that the drawings are not necessarily to scale and that the embodiments are sometimes illustrated by graphic symbols, phantom lines, diagrammatic representations and fragmentary views. In certain instances, details which are not necessary for an understanding of the present invention or which render other details difficult to perceive may have been omitted. It should be understood, of course, that the invention is not necessarily limited to the particular embodiments illustrated herein.
- It should be understood that the invention is useful for mercury and arsenic removal from any contaminated water, including drinking water; industrial wastewaters; contaminated ground water supplies; aqueous mining wastes; and contaminated underwater and soil sediments, particularly when contained in a reactive mat, as described in the applications identified in paragraph [0003], or when used in bulk form.
- The Hg/As removal media described herein is a mercapto- or sulfide-containing layered organophilic phyllosilicate that is (or has been) made organophilic by reaction with an organic phyllosilicate surface-treating agent, preferably an onium ion-liberating compound, and has been made mercury-reactive and arsenic-reactive by bonding a mercapto- or sulfide-containing coupling agent to the phyllosilicate platelets.
- The phyllosilicate can be a smectite clay, e.g., bentonite, montmorillonite, hectorite, beidellite, saponite, nontronite, volkonskoite, sauconite, stevensite, and/or a synthetic smectite derivative, particularly fluorohectorite and laponite; a mixed layered clay, particularly rectorite and their synthetic derivatives; vermiculite, illite, micaceous minerals, and their synthetic derivatives; layered hydrated crystalline polysilicates, particularly makatite, kanemite, octasilicate (illierite), magadiite and/or kenyaite; attapulgite, palygorskite, sepoilite; or any combination thereof.
- The surface modification (intercalant) agents used for organoclay formation include but are not limited to primary amine, secondary amine, tertiary amine, and onium ions and/or onium salt compounds, polyquat, polyamine, cationic polymers and their derivatives, nonionic polymers, and mixtures of thereof.
- In the wet process, the surface modification agent, e.g., onium ion, is introduced into the layered material galleries in the form of a solid or liquid composition (neat or aqueous, with or without an organic solvent, e.g., isopropanol and/or ethanol, if necessary to aid in dissolving the onium ion compound) having a surface modification, e.g., onium ion concentration sufficient to provide a concentration of about 5% to about 10% by weight clay (90-95% water) and the surface modification agent, e.g., onium ion compound, is added to the clay slurry water, preferably at a molar ratio of onium ions to exchangeable interlayer cations of at least about 0.5:1, more preferably at least about 1:1. The onium ion-intercalated clay then is separated from the water easily, since the clay is now hydrophobic, and dried in an oven to less than about 5% water, preferably bone dry. The onium ion surface modification agent compound or polymer can be added as a solid with the addition to the layered material surface modification agent blend of preferably about 20% to about 40% water and/or organic solvent, more preferably at least about 30% water or more, based on the dry weight of layered material. Preferably about 30% to about 40% water, more preferably about 25-35% water, based on the dry weight of the layered material, is included in the onium ion intercalating composition, so that less water is sorbed by the intercalate, thereby necessitating less drying energy after onium ion intercalation.
- In general, a dry process can be described, as follows, for organoclay media preparation or manufacturing. The powder form of clay mineral is fed into a mixer through a major port for solids, typically an extruder. A separate port for the 2nd powder form of solid can also be used besides the clay feeding port. The liquid forms of the additives, including water, intercalant agent, and the coupling agent if any, are fed into the mixer through the separate ports. Either multiple forms of the solids or the liquids could be pre-mixed, or both the solids and the liquids can be pre-mixed through a separate mixer, before they are fed into the extender. A preferred liquid weight is from 10% to 50% based on the total mixture weight, more preferably from 20% to 40%, most preferably from 25% to 35%. The intimate mixture from the extruder will be further dried through a dryer, and be ground to the preferred particle size. A screening process could be used to collect the finished product in the desired particle size distribution.
- The onium ions may generally be represented by the following formula:
- The preferred phyllosilicate surface-treating agent is one or more onium ion salt compounds, generally represented by the following formula:
- wherein Q=N, P, S;
wherein A=halide, acetate, methylsulfate, hydroxide, preferably chloride;
wherein R1, R2, R3 and R4 are independently organic moieties, or oligomeric moieties or hydrogen. (Ref. U.S. Pat. No. 6,376,591), hereby incorporated by reference. Examples of useful organic moieties include, but not limited to, linear or branched alkyl, benzyl, aryl or aralkyl moieties having 1 to about 24 carbon atoms. -
- bis(hydrogenated tallow alkyl)dimethyl ammonium chloride (Arquad® 2HT);
- benzylbis(hydrogenated tallow alkyl)methyl ammonium chloride (Arquad® M2HTB);
- benzyl(hydrogenated tallow alkyl)dimethyl ammonium chloride (Arquad® DMHTB);
- trihexadecylmethyl ammonium chloride (Arquad® 316);
- tallowalkyl trimethyl ammonium chloride (Arquad® T-27W and Arquad® T-50);
- hexadecyl trimethyl ammonium chloride (Arquad® 16-29W and Arquad® 16-50);
- octadecyl trimethyl ammonium chloride (Arquad® 18-50(m)); and
- dimethylhydrogenated tallow-2-ethylhexyl ammonium methylsulfate.
- Additional phyllosilicate surface-treating agents include the materials set forth below in paragraphs [0024] to [0030].
- Quaternary Ammonium Ions Containing Ester Linkage: (Ref. U.S. Pat. No. 6,787,592, Hereby Incorporated by Reference, See Column 5 and 6)
-
- di(ethyl tallowalkylate)dimethyl ammonium chloride (Arquad® DE-T).
- Quaternary Ammonium Ions Containing Amide Linkage: (Ref US Patent application 2006/0166840 Hereby Incorporated by Reference, See Page 2)
- The onium ions may be functionalized such as protonated α,ε-amino acid with the general formula (H3N—(CH2)n—COOH)+.
- Alkoxylated Quaternary Ammonium Chloride Compounds (Ref. U.S. Pat. No. 5,366,647 Hereby Incorporated by Reference)
-
- cocoalkylmethylbis(2-hydroxyethyl) ammonium chloride (Ethoquad® C/12);
- octadecylmethyl[polyoxyethylene(15)] ammonium chloride (Ethoquad® 8/25); and
- octadecylmethyl (2-hydroxyethyl) ammonium chloride (
Ethoquad 18/12). - Polyquat (U.S. Pat. No. 6,232,388, Hereby Incorporated by Reference)
-
- N,N,N′,N′,N′-pentamethyl-N-tallowalkyl-1,3-propane diammonium dichloride (Duaquad® T-50).
- Polyamine: (Ref. Us Patent Application 2004/0102332 Hereby Incorporated by Reference)
-
- N-tallow-1,3-diaminopropane (Duomeen® T);
- N-tallowalkyl dipropylene triamine (Triameen® T); and
- N-tallowalkyl tripropylene tetramine (Tetrameen® T).
- Cationic Polymers, Non-Ionic Polymers, Including Homopolymer or Copolymer, Low Molecular Weight or High Molecular Weight
-
- Polydiallydimethylammonium chloride;
- Poly(dimethylamine-co-epichlorohydrin);
- Polyacrylamide; and
- Copolymer of acrylamide and acryloyloxylethyltrimethyl ammonium chloride.
- Examples of the preferred silane coupling agents containing a mercapto, disulfide, tetrasulfide, or polysulfide reactant group include, for example, 3-Mercaptopropyltrimethoxysilane; 3-Mercaptopropyltriethoxysilane; 3-Mercaptopropylmethyldimethoxysilane; (Mercaptomethyl)dimethylethoxysilane; (Mercaptomethyl)methyldiethoxysilane; 11-mercaptoundecyltrimethoxysilane; Bis[3-(triethoxysilyl)propyl]-tetrasulfide; Bis[3-(triethoxysilyl)propyl]-disulfide; Bis-[m-(2-triethoxysily)lethyl)tolyl]-polysulfide; and mixtures thereof.
- In a preferred embodiment, particularly in offshore environments, the Hg/As removal media described herein can be used after the use of an organoclay for removal of organics in order to protect and extend the active life of both the organoclay, in an initial organoclay stage, and the Hg/As removal media, used after organic contaminant removal. An operation procedure using an initial organoclay media followed by contact with the Hg/As removal media, in series, is highly effective. A carbon media can also be used before or after the Hg/As removal media, if necessary. In general, the retention time of contact between Hg/As-contaminated water and the Hg/As removal media should be no less than about 10 seconds, preferably at least about 1 minute, more preferably about 2 minutes or more.
- The preferred amounts of components that form the coupling agent-reacted organoclay Hg/As removal media are as follows, in percent by weight of product (media):
-
Phyllosilicate Intercalant Agent Coupling Agent Preferably 1-90 10-50 0.5-50 More Preferably 35-83 15-45 2-20 More Preferably 50-77 20-40 2-12 More Preferably 59-71 25-35 5-9 Most Preferably 65 28 7 - In preparing the product, it is preferred that the particle size of the organophilic clay is fine enough that at least 80% by weight of the clay particles pass through a 20 mesh screen, U.S. Sieve Series; more preferably at least 80% by weight of the clay particles pass through a 100 mesh screen, U.S. Sieve Series; and most preferably at least 80% of the clay particles pass through a 140 mesh screen, U.S. Sieve Series. The preferred sulfur particles have a particles size such that at least 80% by weight of the particles pass through an 18 mesh screen, U.S. Sieve Series; more preferably at least 80% by weight of the sulfur particles pass through at 50 mesh screen, U.S. Sieve Series; even more preferably at least 80% by weight of the sulfur particles pass through an 80 mesh screen, U.S. Sieve Series; and most preferably, at least 80% of the sulfur particles pass through a 100 mesh screen, U.S. Sieve Series.
- To achieve the full advantage of the removal media described herein, the final product formed should have a particle size such that at least 80% by weight of the particles pass through a 4 mesh (5 mm) screen; preferably at least 80% of the product particles should be smaller than 3 mm; and more preferably at least 80% by weight the product particles should be smaller than 2 mm. The preferred particle size range for the product particles is such that at least 80% by weight of the product particles are sized between 18 and 50 mesh, U.S. Sieve Series; more preferably at least 80% by weight of the product particles are sized between 10 mesh and 30 mesh, U.S. Sieve Series; even more preferably, at least 80% by weight of the product particles are sized between 8 and 40 mesh, U.S. Sieve Series; and most preferably, at least 80% by weight of the product particles are sized between 6 and 18 mesh, U.S. Sieve Series.
- A column study was conducted in order to demonstrate the mercury removal media's ability to remove mercury. The influent was composed of ˜10 ppm of Hg(NO3)2 solution with dilute nitric acid matrix. The effluent samples were taken at regular intervals and the mercury content was measured by an ICP analytical test. The flow rate was about 10 BV/hr using a 6-minute retention time. The effluent curve is shown in
FIG. 1 . A commercial mercury removal media (Hg/As of SME Associates, Houston, Tex.) containing a mixture of 85-90% activated carbon and 10-15% sulfur was also included in this study for comparison purpose, as shown inFIG. 1 . - Although only a dry-process is described in the following examples, a wet-process is also suitable as the process to make the mercury removal media described herein.
- 800.0 g of bentonite clay (particle size <75 μm preferred, and ˜8% moisture content) was mixed with 160.0 g of deionized water using the Kitchen Aid mixer until a homogenous mixture was obtained. 380.0 g of melt quat (ARQUAD® 2HT from Akzo Nobel, bis(hydrogenated tallow alkyl)dimethyl ammonium chloride, ˜83% active) was added to this bentonite-water mixture under shearing using the same mixer, and mixed for 5 minutes. 40.0 g of the silane agent (Silquest® A-189 from GE Silicones, gamma-Mercaptopropyltrimethoxysilane) was pre-mixed with 20.0 g of ethanol and 2.0 g of water. This fresh prepared solution was added to the above clay-water-quat mixture, and mixed for 5 minutes. This mixture was extruded three times using a laboratory-scale extruder with a die-plate, and the final extrudates were oven-dried at 85° C. to a moisture content of less than 5% by weight. The dried extrudates were ground and resulting particles between 18 and 40 mesh (US standard sieves) were collected and tested for their performance.
- Very similar preparation procedure was conducted except 80.0 g of the silane agent was pre-mixed with 80.0 g of ethanol and 8.0 g of water, and was subsequently added to clay-water-quat mixture.
- 800.0 g of bentonite clay (particle size <75 μm preferred, and ˜8% moisture content) was mixed with 160.0 g of deionized water using the kitchen Aid mixer until a homogenous mixture was obtained. 60.0 g of the silane agent (Silquest® A-189 from GE Silicones, gamma-Mercaptopropyltrimethoxysilane) was mixed with 380.0 g of melt quat (ARQUAD® 2HT from Akzo Nobel, bis(hydrogenated tallow alkyl)dimethyl ammonium chloride, ˜83% active), and this mixture was added to the bentonite-water mixture under shearing using the same mixer, and mixed for 5 minutes. This mixture was extruded three times using a laboratory-scale extruder with a die-plate, and the final extrudates were oven-dried at 85° C. to a moisture content of less than 5% by weight. The dried extrudates were ground and resulting particles between 18 and 40 mesh (US standard sieves) were collected and tested for their performance.
- The media material collected in Example 1 was packed in a column with an inner diameter of 1.5″ and having an empty bed volume (BV) of ˜92 mL. The influent was composed of ˜10 ppm of Hg(II) in the presence of nitric acid. The effluent samples were taken at regular intervals and the mercury content was measured by the Inductively Coupled Plasma (ICP) analytical technique. The flow rate was about 10 BV/hr with a 6-minute retention time. The effluent data is plotted in
FIG. 1 . A commercial organoclay media is also included in this study for the comparison purpose. - Column tests were also conducted on the organoclay media materials collected from Examples 2 and 3. The results are also plotted in
FIG. 1 . - A column test was conducted on the organoclay media collected in Example 2. The influent was composed of ˜10 ppm of Hg(II) and ˜8 ppm of mechanical emulsified motor oil. The oil concentration in influent and effluent was characterized by Total Oil & Grease (TOG) analytical test. Throughout the test, the TOG for effluent was maintained at 0 ppm. The effluent results on mercury were plotted in
FIG. 2 . - A column test was conducted on the organoclay media collected in Example 2. The influent was composed of 224 ppb of Hg(II). The effluent samples were taken at 9.4, 18.9, 28.3 Bed Volume intervals and their mercury concentration were 1.2 ppb, 0.8 ppb and 0.3 ppb, respectively. The mercury measurement tests were conducted by Test America (Buffalo Grove, Ill.) using EPA 245.2 test method.
- Bentonite powder was fed into a 5″ Readco continuous processor at a feed rate of 600 lb/hr. About 0.40 gallon/minute of water and 0.78 gallon/minute of combined mixture of quat and silane coupling agent were also fed in the Readco processor through two independent ports in sequence. The mixed ratio between the quat (ARQUAD® 2HT from Akzo Nobel, bis(hydrogenated tallow alkyl)dimethyl ammonium chloride, ˜83% active) and the silane coupling agent (Silquest® A-189 from GE Silicones, gamma-Mercaptopropyltrimethoxysilane) was abut 82.6:17.4 by weight. The discharged extrudates from the processor were sent to a dryer, the dried extrudates were further milled and the granular particles between 18 and 40 mesh with a moisture content less than 5% by weight were colleted as the finished product.
- A similar column test as described in Example 4 was conducted on the product sample collected in Example 9. The effluent testing results are plotted in
FIG. 3 . - The Hg/As removal media described in Example 9 was tested under offshore platform conditions using the actual offshore mercury contaminated water. A commercially available organoclay product, CrudeSorb™, was also used in front of this Hg/As removal media. The influent had a mercury concentration of 37.7 ppb, and the effluent was 2.8 and 4.2 ppb after the 30-minute and 90-minute treatment, respectively. A total mercury removal efficiency of >88% was achieved.
- The media described in Example 9 was examined for its ability to remove arsenic. The media materials were packed in a column having an inner diameter of 1.5″ and empty bed volume of ˜86 mL. The influent solution was composed of ˜5 ppm of As(V). The As(V) stock solution was prepared by dissolving Na2HAsO4.7H2O in the de-ionized water. The effluent samples were taken at regular intervals and the arsenic content was measured by the Inductively Coupled Plasma (ICP) analytical technique. The flow rate was around 10 BV/hr with 6-minute retention time. During 90 bed volume treatment, the average effluent concentration was 3 ppm for a 40% removal of arsenic by the media.
- The media material described in Example 9 was tested under offshore platform conditions using the actual wastewater contaminated by both mercury and arsenic. The contaminated water was pumped through two columns in series. Each column had a diameter of 3″ and held about 1.5 Liter of media (˜1,125 grams). The first column was packed with the commercial available organoclay media, CrudeSorb™, and the second column was packed the media material described in Example 9. The retention time was roughly equal to 5-minute. The influent had mercury and arsenic concentration of 37.7 ppb and 8.17 ppb, respectively. After the 30 minutes and 90 minutes treatment, the effluent had mercury concentrations of 2.8 ppb and 4.2 ppb, arsenic concentrations of 5.70 ppb and 5.87 ppb, respectively. So a total mercury and arsenic removal efficiency of greater than 88% and 28% were achieved, respectively.
- The sulfur impregnated organoclay media and the coupling agent-reacted organoclay media were tested as a package using the actual wastewater contaminated by both mercury and arsenic species on an offshore platform. The contaminated water was pumped through two columns in a series operation. Each column had a diameter of 3″ and held about 1.5 Liter of media (˜1,125 grams). The first column was packed with the sulfur impregnated organoclay media as described in Example 3, and the second column was packed with the coupling agent-reacted organoclay media as described in Example 9. The retention time was roughly equal to 5-minute. The influent had mercury and arsenic concentration of 26.8 ppb and 10.68 ppb, respectively. After the 30 minutes treatment, the effluent had mercury and arsenic concentrations of 2.4 ppb and 2.15 ppb, respectively. So a total mercury and arsenic removal efficiency of greater than 91% and 79% were achieved, respectively.
- Turning now to the drawings, and initially to
FIG. 4 , there is shown an offshore drilling platform generally designated byreference numeral 10 including a workdeck support structure 12 for supporting a plurality of stacked work decks at a substantial height above anocean water level 14. The work decks commonly include acellar deck 16 at a lowest work deck level, asecond deck 18 located directly above thecellar deck 16, athird deck 20 disposed directly abovedeck 18, and amain deck 22 at an uppermost work deck level. In extant offshore drilling platforms, asump tank 24 has been connected to thedrilling platform 10 at thecellar deck level 16 and rainwater, including entrained hydrocarbons, particularly oil, paraffins and surfactants have been directed from all deck levels, which are contained so that rainwater and entrained hydrocarbons do not spill over to the ocean, to drain by gravity into thesump tank 24. As described in this assignees U.S. Pat. Nos. 6,398,951; 6,398,966; 6,409,924; and 6,749,757, further separation of hydrocarbons from rainwater, in addition to gravity separation, is required for effective elimination of ocean water hydrocarbon contamination by providing a secondary hydrocarbon recovery apparatus containing an organoclay after the produced water and/or rainwater has been separated by gravity in thesump tank 24 or 24A. In the preferred embodiment of mercury and/or arsenic removal using the methods and apparatus described herein for mercury and/or arsenic removal offshore, one or more canisters (not shown) containing an organoclay, for hydrocarbon removal, is used in series with one or more canisters containing the Hg/As removal media (in any order). It is preferred to remove the hydrocarbons with organoclay-containing canister(s) prior to mercury and/or arsenic removal with Hg/As removal media-containing cartridges. - In accordance with a preferred embodiment of the methods, apparatus and Hg/As removal media described herein, it has been found that the apparatus and methods described herein function best, in offshore platform use, when the sump tank 24A is disposed on or near a boat landing deck level 26 (
FIG. 4 ) of theoffshore drilling platform 10. However, the sump tank can also be disposed at an upper level, such as atreference numeral 24 inFIG. 4 . - Mercury and/or arsenic from ocean water that is collected on the
production decks conduit 28 and inner surfaces ofsump tank 24 can be separated from the water that flows from the decks to the Hg/As removal media-containingcartridge 44 for recovery and separation in accordance with the apparatus and methods described herein. - Water containing mercury and/or arsenic is conveyed via
conduit 28 from thedeck areas support leg 12 down to thesump tank 24 or 24A, preferably sump tank 24A for convenient servicing and/or Hg/As removal media cartridge replacement. As stated in this assignee's U.S. Pat. Nos. 6,398,951, 6,398,966 and 6,409,924, it is expedient to dispose the separation apparatus described herein at or near the boat landing deck level 26 (such that at least a portion of the sump tank 24A is within about 10 feet of ocean level) since contaminants collected on theproduction decks conduit 28 and inner surfaces of sump tank 24A can be separated from the water that flows from the decks to the sump tank 24A for recovery and separation in accordance with the apparatus and methods described herein. - In accordance with an important feature of the methods, apparatus and mercury removal media described herein, a downwardly extending
leg portion 42 of water leg 34 is operatively interconnected to, and in fluid communication with, one or more mercury and/or arsenic media-containingvessels 44. As shown inFIG. 5 , the mercury removal media withinvessel 44 captures the mercury and thereby separates essentially all mercury from the water (less than about 10 parts per million, preferably less than about 1 part per million mercury remains). The treated water flows through the liquid-permeable covers 76 of thecartridges 55 into thevessel 44. The treated water then flows by gravity through water exit opening 46 in the water and coalescedhydrocarbon collection vessel 44 and throughexit conduit 48 back to theocean water 14. - As shown in
FIGS. 5 and 8 ,vessel 44 includes an outer, fluid-impermeable housing 48 having awater inlet 42 interconnected through thehousing 48 so that mercury-contaminated water entersvessel 44 and then flows through the HG/As removal media-containingcartridges 55, through a plurality of longitudinal, axial,central inlet conduits cartridges 55 are water-permeable by virtue offlow apertures 57, in thecartridge cover 76, that are sized sufficiently small such that the mercury removal media does not pass therethrough.Water entering vessel 44 throughinlet conduit 42 andcartridge inlet conduits mercury removal media 45 where the mercury removal media captures, and removes, the mercury from the contaminated water. The purified water flows through theopenings 57 in each liquidpermeable cartridge cover 76 and collect invessel 44. The clean water exits thevessel 44 throughexit conduit 69 and throughvalve 71 and then is returned to theocean 14 viaoutlet 73. - Turning to
FIG. 6 , another embodiment of avessel 100 is shown containing stacks of cartridges, one of which is shown at 102. Each cartridge stack includes a plurality ofannular cartridges 104 through which a porous contaminatedliquid inlet conduit 106 extends. Theporous inlet conduit 106 is connected to aheader 108 which is disposed within abottom section 110 of thevessel 100, similar to the contaminatedwater inlet conduits FIG. 5 . - Turning to
FIGS. 6 and 7 , theheader 108 is connected to a mercury-contaminatedwater inlet 112 which includes aflange 114 which is connected to theflange 116 of theheader 108 by a plurality of fasteners, such as bolts (not shown). The header is also supported within the bottom structure 110 (seeFIG. 6 ) of the vessel by a plurality of supports shown at 118. Theheader 108 includes a plurality ofopenings 120, each of which receives a permeable conduit 106 (seeFIG. 6 ). In the embodiment illustrated inFIGS. 6 and 7 , theheader 108 is connected to 23 permeable conduits and therefore supports 23stacks 102 ofcartridges 104. By providing theheader 108 within thebottom structure 110 of thevessel 100, apermeable tube sheet 111 shown inFIG. 5 is not needed for collecting solids and thebottom section 110 of the vessel can be used to collect accumulated solids, or solids which do not pass through the outer covers 76 of thefilter cartridges 104. Adrain 122 is provided for purposes of flushing out the accumulated solids which settle in thebottom structure 110 of thevessel 100, together with the clean water. The clean water can be passed through asolids filter 123 before being directed to the ocean throughconduit 125. In contrast, solids will accumulate on top of thetube sheet 111. Thus, the solids must be removed from above thetube sheet 108 using one or more nozzle openings shown at 109 inFIG. 5 . As shown inFIG. 6 , these additional nozzle openings are not required in thevessel 100 because the accumulated solids are easily flushed down thedrain pipe 122 into solids filter 123. - As shown in
FIG. 6 , an extremely dense number of stacks ofcartridges 104 is provided by theheader 108. Specifically, theheader 108, as shown inFIG. 7 , includes 23openings 120, and therefore 23porous conduits 106 and therefore 23stacks 102 ofcartridges 104. Accordingly, the volumetric flow rate that can be handled by thevessel 100 is substantially greater than the volumetric flow rate that can be handled by thevessel 44. Of course, smaller vessels with fewer stacks of cartridges and large vessels with more stacks of cartridges are anticipated.
Claims (21)
1. A contaminant removal media for removing mercury and/or arsenic from water or removing mercury from a gas by contact, comprising:
an intimate mixture of a coupling agent-reacted layered phyllosilicate, wherein the coupling agent includes a mercapto or sulfide moiety.
2. The contaminant removal media of claim 1 , wherein the percentage of components is as follows:
a) layered phyllosilicate: 50 to 99.5 wt. %; and
b) coupling agent: 0.5 to 50 wt. %.
3. The contaminant removal media of claim 1 further including a phyllosilicate intercalant agent, and wherein the percentage of components is as follows:
c) layered phyllosilicate: 1-90 wt. %; intercalant agent: 10-50 wt. %; and
d) coupling agent: 0.5-50 wt. %.
4. The contaminant removal media of claim 3 wherein the percentage of components is as follows:
e) layered phyllosilicate: 35-83 wt. %; intercalant agent: 15-45 wt. %; and
f) coupling agent: 2-20 wt. %.
5. The contaminant removal media of claim 4 wherein the percentage of components is as follows:
g) layered phyllosilicate: 50-77 wt. %; intercalant agent: 20-40 wt. %; and
h) coupling agent: 2-12 wt. %.
6. The contaminant removal media of claim 5 further including an intercalant agent, and wherein the percentage of components is as follows:
i) layered phyllosilicate: 59-71 wt. %; intercalant agent: 25-35 wt. %; and
j) coupling agent: 5-9 wt. %.
7. The contaminant removal media of claim 6 wherein the percentage of components is as follows:
k) layered phyllosilicate: 65 wt. %; intercalant agent: 28 wt. %; and
l) coupling agent: 7 wt. %.
8. The contaminant removal media of claim 1 , wherein the mixture is compacted in an extruder.
9. A method of removing mercury and/or arsenic from water or for removing mercury from a gas comprising contacting the water or gas with the contaminant removal media of claim 1 .
10. A method of removing mercury and/or arsenic from water or for removing mercury from a gas comprising contacting the water or gas with the contaminant removal media of claim 3 .
11. The mercury removal media of claim 1 , wherein the coupling agent-reacted layered phyllosilicate has a particle size finer than 18 mesh, U.S. Sieve Series.
12. A contaminant removal media for removing mercury and/or arsenic from water or removing mercury from a gas, by contact, comprising:
a mixture of a layered phyllosilicate intercalated with an intercalant surface modification agent; and a coupling agent containing a mercapto or sulfide moiety intimately mixed for reaction of the coupling agent with the layered phyllosilicate.
13. A method of regenerating contaminated water containing organic and mercury or arsenic contaminants comprising:
contacting the contaminated water with an organoclay for removal of organic contaminants; and
contacting the contaminated water with the contaminant removal media of claim 1 for removal of mercury or arsenic contaminants.
14. A method of regenerating contaminated water containing organic and mercury or arsenic contaminants comprising:
contacting the contaminated water with an organoclay for removal of the organic contaminant; and
contacting the contaminated water with the contaminant removal media of claim 3 for removal of mercury or arsenic contaminants.
15. The method of claim 14 wherein the organoclay and contaminant removal media are contained in separate vessels connected in series.
16. The method of claim 14 wherein the organoclay and contaminant removal media are contained in the same vessel.
17. A method of regenerating a contaminated gas containing organic and mercury or arsenic contaminants comprising:
contacting the contaminated gas with an organoclay for removal of organic contaminants; and
contacting the contaminated water with the contaminant removal media of claim 14 for removal of mercury contaminants.
18. A method of regenerating a contaminated gas containing organic and mercury or arsenic contaminants comprising:
contacting the contaminated gas with an organoclay for removal of the organic contaminant; and
contacting the contaminated water with the contaminant removal media of claim 3 for removal of mercury contaminants.
19. The contaminant removal media of claim 1 , wherein the media comprises particles having a particle size such that at least 80% by weight of the particles are finer than 5 mm.
20. The contaminant removal media of claim 19 , wherein the media comprises particles having a particle size such that at least 80% by weight of the particles are finer than 3 mm.
21. The contaminant removal media of claim 20 , wherein the media comprises particles having a particle size such that at least 80% by weight of the particles are finer than 2 mm.
Priority Applications (6)
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US12/116,383 US20080302733A1 (en) | 2007-06-05 | 2008-05-07 | Coupling agent-reacted mercury removal media |
CN200980126655.0A CN102089260B (en) | 2008-05-07 | 2009-04-14 | Coupling agent-reacted mercury and/or arsenic ion removal media |
PCT/US2009/040430 WO2009137230A1 (en) | 2008-05-07 | 2009-04-14 | Coupling agent-reacted mercury and/or arsenic ion removal media |
EP09743217A EP2274257A1 (en) | 2008-05-07 | 2009-04-14 | Coupling agent-reacted mercury and/or arsenic ion removal media |
CA2723417A CA2723417C (en) | 2008-05-07 | 2009-04-14 | Coupling agent-reacted mercury and/or arsenic ion removal media |
US13/224,840 US8382990B2 (en) | 2007-06-05 | 2011-09-02 | Method of removing mercury and/or arsenic from water or mercury from a gas using an extruded onium ion intercalated silane coupling agent reacted layered phyllosilicate |
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US11/810,240 US7871524B2 (en) | 2007-06-05 | 2007-06-05 | Method for removing merury and/or arsenic from water using a silane coupling agent reacted organoclay |
US12/116,383 US20080302733A1 (en) | 2007-06-05 | 2008-05-07 | Coupling agent-reacted mercury removal media |
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US11/810,240 Continuation-In-Part US7871524B2 (en) | 2007-06-05 | 2007-06-05 | Method for removing merury and/or arsenic from water using a silane coupling agent reacted organoclay |
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US13/224,840 Expired - Fee Related US8382990B2 (en) | 2007-06-05 | 2011-09-02 | Method of removing mercury and/or arsenic from water or mercury from a gas using an extruded onium ion intercalated silane coupling agent reacted layered phyllosilicate |
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Also Published As
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US20110315013A1 (en) | 2011-12-29 |
CN102089260B (en) | 2014-03-12 |
CN102089260A (en) | 2011-06-08 |
CA2723417C (en) | 2013-03-19 |
CA2723417A1 (en) | 2009-11-12 |
US8382990B2 (en) | 2013-02-26 |
WO2009137230A1 (en) | 2009-11-12 |
EP2274257A1 (en) | 2011-01-19 |
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