Method for recycling and purifying ionic liquid in mixed solution

A technology of mixing solutions and ionic liquids, applied in organic chemistry and other fields, can solve the problems of low purity of ionic liquids, water pollution, recycling fees, etc., and achieve the effects of large-scale application, high recycling efficiency, and low cost

Inactive Publication Date: 2013-07-24
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, although ionic liquids do not pollute the atmosphere, they will cause serious water pollution due to their potential toxicity and non-biodegradability, so the recovery of ionic liquids is particularly important.
Patent 200819200367.2 adopts ion exchange resin and nanofiltration method to recover ionic liquid, which has low efficiency and is difficult to apply on a large scale
Patent No.: 200910093300.8

Method used

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  • Method for recycling and purifying ionic liquid in mixed solution

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0017] Example 1

[0018] 1) Ionic liquid / cellulase in-situ degradation process of straw: Use ionic liquid 1-ethyl-3-methylimidazole diethyl phosphate [EMIM] DEP to treat corn stalks at 130°C, and then cool it in ionic liquid Add water and cellulase enzyme powder, adjust pH=2.0 with ammonia water, make the final concentration of ionic liquid 5.0% (v / v), and the final concentration of cellulase is 12.5FPU / mL.

[0019] 2) Construction of reverse micelle system: Pipette 2ml xylene and 4ml n-hexanol to dissolve each other in a test tube, weigh 0.97g Triton X-100 solution and dissolve it in the xylene and n-hexanol mixture, and shake the test tube, fully shake the test tube until the test tube There is no colorless and transparent layered liquid at the bottom, and the mixed solution is clear and transparent. Then add 27μml of enzyme buffer solution with pH=5.8 to the mixed solution to obtain ωo=1,250mmol / L Triton X-100 / xylene, n-hexane Alcohol (1:2, v / v) reverse micelle solution.

[002...

Example Embodiment

[0022] Example 2

[0023] 1) Ionic liquid / cellulase in-situ enzymatic hydrolysis of straw: Use ionic liquid 1-methyl-3-methylimidazole diethyl phosphate ([MMIM]DEP) to treat bagasse at 100℃, and then cool down Add citrate buffer and cellulase enzyme powder to the ionic liquid, adjust pH=4.8, make the final concentration of ionic liquid 20% (v / v), and the final concentration of cellulase to 13FPU / mL.

[0024] 2) Construction of reverse micelle system: Weigh 2.2228g sodium diisooctyl succinate (AOT) into a beaker, dissolve it with 2,2,4-trimethylpentane (isooctane), and transfer it into The volume is constant in a 100ml volumetric flask, fully shaken until the solution in the flask is colorless and transparent, and then 0.9g of distilled water is dropped into it to obtain an AOT / iso-octane reverse micelle system with ωo=10, 50mmol / L.

[0025] 3) Recycling of ionic liquid in reverse micelle system: The reverse micelle system is used to remove cellulase in the mixed system of cellulase ...

Example Embodiment

[0026] Detect the volume and content of the distilled ionic liquid: Dilute the distilled ionic liquid and measure the absorbance at 210nm. The recovery rate of the ionic liquid reaches 98%, and it has been verified that the ionic liquid can continue to be used for cellulose Pretreatment. And separating the ionic liquid from the enzyme is also beneficial to the recovery of the enzyme. Example 3

[0027] 1) Ionic liquid / cellulase in-situ enzymatic hydrolysis of straw: Use ionic liquid 1-methyl-3-methylimidazole diethyl phosphate ([MMIM]DEP) to treat bagasse at 100℃, and then cool down Add citrate buffer and cellulase enzyme powder to the ionic liquid, adjust pH=10, make the final concentration of the ionic liquid 30% (v / v), and the final concentration of cellulase to 13FPU / mL.

[0028] 2) Construction of reverse micelle system: Weigh 0.25g of CTAB, add organic solvent (the amount of isooctane added is 6.5mL,

[0029] The amount of alcohol is 0.2mL) to form an emulsion, and then add ...

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Abstract

The invention discloses a method for recycling and purifying ionic liquid in a mixed solution. According to the method, the mixed solution is extracted by using a reverse micelle system to obtain purified ionic liquid. The method comprises the following steps of: (1) preparing the needed reverse micelle system; (2) adding the reverse micelle system into the mixed solution to facilitate extraction of the reverse micelle system for the mixed solution to obtain an extracted solution; and (3) distilling the extracted solution to obtain the purified ionic liquid. The ionic liquid recycling method is high in recycling efficiency and low in cost; the obtained ionic liquid is high in purity; a liquid-liquid extraction method is favorable for large-scale application, suitable for industrial production; and other impurities are separated from the ionic liquid while the ionic liquid is recycled, thereby facilitating recycling of other substances, such as protein and the like.

Description

technical field [0001] The invention relates to a method for recovering and purifying an ionic liquid, in particular to a method for recovering and purifying an ionic liquid in a mixed solution. Background technique [0002] Ionic liquids are liquids composed entirely of anions and cations. Substances composed of ions that are liquid at room temperature or near room temperature are called room temperature ionic liquids (RTILs). As a salt that melts at room temperature or near room temperature, ionic liquid has the characteristics of non-volatility, good ionic conductivity and thermal conductivity, high heat capacity and high thermal stability, and selective solubility, making ionic liquid a One of the hotspots in the field of chemistry and chemical engineering. It has also attracted much attention in biocatalysis, and more importantly, the "designability" of ionic liquids. Different ionic liquids can be designed by changing the anions and cations of ionic liquids, so that ...

Claims

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Application Information

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IPC IPC(8): C07D233/58
Inventor 李强冯圆圆季更生唐玉斌
Owner JIANGSU UNIV OF SCI & TECH
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