Ionic liquids

A technology of ionic liquids and anions, applied in gas treatment, separation methods, greenhouse gas capture, etc., can solve problems such as time-consuming, high energy consumption, and loss of effective amines

Inactive Publication Date: 2012-07-11
COMMONWEALTH SCI & IND RES ORG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) From rich CO 2 CO desorption from amine solution 2 High energy consumption required;
[0006] (2) Amine absorbents cause corrosion to alloy steel pipe fittings, pumps, etc.;
[0007] (3) thermal or chemical decomposition of amines in the absorbent creating additional waste streams and loss of available amine; and
[0008] (4) Volatile amines enter the airflow from the absorbent and cause losses
However, both methods require elaborate and time-consuming synthetic steps to prepare the constituent cations and / or anions of these specialized ionic liquids

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0149] [EMIM][TFSI] containing transition metals

[0150] Bis(trifluoromethanesulfonyl)imide metal hydrate M(TFSI) 2 Synthesis of x (hydrated) (M=Co, Cu, Ni, Zn)

[0151] Metal bis(trifluoromethanesulfonyl)imides were synthesized by the method of Earle, M.J. et al. (Earle, M.J. et al, Chem. Commun. 2004, 1368-1369; Earle, M.J. WO 200272260). 0.02mol HNTf 2 Dissolve in 20ml deionized water, then add 0.01mol metal hydroxide M(OH) to the solution 2 (M=Cu, Co, Ni). After stirring the suspension at room temperature for about 24 hours, the water was removed under vacuum at 40°C. The resulting product was dried at 60° C. under high vacuum for at least 24 hours. The hydrated product was obtained in 89% to 92% yield.

[0152] Metallic zinc (bulk) (1.94 g, 29.64 mmol) was added to HNTf dissolved in 30 ml deionized water 2 1.25H 2 O (6g, 19.76mmol) solution. The suspension was stirred at room temperature for 24 hours, after which the pH reached 7. The reaction product was filte...

Embodiment 2

[0171] [EMIM][TFSI] containing main group metals

[0172] Synthesis of Magnesium(II) Bis(trifluoromethanesulfonyl)imide

[0173] Magnesium turnings (0.08g, 3.29mmol) were added to HNTf 2 1.25H 2 A solution of O (2.0 g, 6.59 mmol) in 10 ml deionized water. The reaction is accompanied by H 2 Bubble generation. The reaction product was stirred at room temperature for 10 hours, after which the pH value reached 7. The reaction mixture was filtered to remove particulates, and the volatile components of the filtrate were removed under vacuum. The product was further dried under vacuum at 150°C overnight to give a white solid (1.61, 84%). The product was found to contain about 0.09 equivalents of water as determined by Karl-Fischer titration. The magnesium content was found to be 4.23% (calculated 4.15%) by ICP-OES. 19 FNMR 200MHz (DMSO-d 6 ): δ-79.18. MS (ESI, MeOH) - 280.2.

[0174] Magnesium(II)-containing ionic liquid [EMIM][TFSI]-Mg(TFSI) 2 Preparation of (4:3 mol:mol...

Embodiment 3

[0183] Contains Zn 2+ [EMIM][DCA]

[0184] Preparation of Zinc Dicyanamide

[0185] Zinc dicyanamide was prepared in a similar manner to Manson, J.L. et al. (Manson, J.L.; Lee, D.W.; Rheingold, A.L.; Miller, J.S. Inorg. Chem. 1998, 37, 5966-5967). A solution of sodium dicyanamide (2.0 g, 22.46 mmol) in deionized water (80 ml) was added to a stirring solution of zinc nitrate hexahydrate (3.34 g, 11.23 mmol) in deionized water (40 ml). The reaction was stirred at room temperature for 16 hours, then the reaction was filtered and the precipitate was washed with deionized water. The precipitate was placed under vacuum to dry overnight over phosphorus pentoxide. The product was a white solid (1.63g, 76%). The melting point is higher than 300°C (DSC).

[0186] Ionic liquid containing Zn(II)[EMIM][DCA]-Zn(DCA) 2 Preparation of (1:0.5 mol:mol)

[0187] Zinc dicyanamide (0.250 g, 1.26 mmol) was added to a round bottom flask containing dicyanamide 1-ethyl-3-methylimidazolium salt ...

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Abstract

A process for the absorption of one or more gas(es) selected from the group consisting of carbon dioxide, hydrogen sulfide, sulfur oxides, nitrogen oxides and carbon monoxide from a fluid, the process including: providing a fluid containing the selected gas(es); and an ionic liquid absorbent, the absorbent including the components: one or more anions; one or more metal species; and optionally one or more organic cations; and optionally one or more ligands; the absorbent components being selected such that the absorbent is in a liquid state at the operating temperature and pressure of the process; with the provisos that: when the anion contains in the same molecular entity: both an amine functional group and a sulfonate functional group; both an amine functional group and a carboxylate functional group; both a phosphine functional group and a sulfonate functional group; or both a phosphine functional group and a carboxylate functional group, the metal species is not an alkali metal or alkaline earth metal; the anion and / or metal species do not form a cuprate; and when the anion and / or metal species form a metal halide, the ionic liquid absorbent includes one or more ligands; contacting the fluid with the ionic liquid absorbent such that the selected gas(es) interact with the metal species; and collecting an ionic liquid in which at least a portion of the selected gas(es) is absorbed.

Description

technical field [0001] This invention relates to methods of absorbing gas from fluids, such as exhaust streams, using absorbents and methods of desorbing gases from gas-rich absorbents. Background technique [0002] With the awareness of environmental problems caused by atmospheric emissions, there has been increased interest in developing or improving technologies involving gas capture. [0003] Several gases including strong acid gases, carbon monoxide, and oxides of sulfur or nitrogen are known to cause serious environmental problems, however technologies involving carbon dioxide capture are of particular interest. [0004] Chemical absorption can be used to remove CO from gas streams, such as those produced by power plants 2 . Currently, chemical absorption methods using aqueous solutions of amines or ammonia are used to capture CO 2 . However, the use of aqueous amine solutions or ammonia as gas absorbents has several disadvantages, including: [0005] (1) From ric...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14B01D53/50B01D53/56B01D53/62
CPCB01D2257/404B01D2257/502B01D53/1456B01D2252/30B01D2257/304B01D2257/402B01D53/1425B01D2257/504B01D2257/302Y02C10/06Y02C20/10B01D53/1493B01D2252/602Y02C20/40B01D53/14B01D53/50B01D53/56B01D53/62
Inventor 黄俊华T.卢瑟P.费隆张正波
Owner COMMONWEALTH SCI & IND RES ORG
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