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Coupling agent-reacted mercury removal media

a technology of reacted mercury and coupling agent, which is applied in the direction of filtration separation, separation process, waste water treatment from quaries, etc., can solve the problems that the technology available for mercury and arsenic removal, such as precipitation, coagulation/co-precipitation, activated carbon adsorption, etc., is not sufficiently effective for mercury and arsenic (arsenite and arsenate compounds), and achieves the effect of increasing the d-

Inactive Publication Date: 2008-12-11
AMCOL INTERNATIONAL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]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.

Problems solved by technology

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.

Method used

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  • Coupling agent-reacted mercury removal media
  • Coupling agent-reacted mercury removal media
  • Coupling agent-reacted mercury removal media

Examples

Experimental program
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Effect test

example 1

Sample L6L

[0058]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 col...

example 2

Sample L6L2

[0059]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.

example 3

Sample L6L3

[0060]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.

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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

CROSS-REFERENCE TO RELATED APPLICATION[0001]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.FIELD OF THE INVENTION[0002]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 pro...

Claims

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Application Information

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IPC IPC(8): C02F1/28B01D39/00B01D53/02
CPCB01D53/02B01D53/64B01D2253/11B01D2257/602B01J20/10B01J20/12B01J20/32C02F1/281C02F1/285C02F1/288C02F2101/103C02F2101/20C02F2103/06C02F2103/10B01J20/3085B01J20/3204B01J20/3257B01J20/3259B01J20/3092B01J2220/58B01J20/3248
Inventor WANG, ZHENABRAHAM, ROBERT
Owner AMCOL INTERNATIONAL CORPORATION
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