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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 Using alumina column chromatography to recover ionic liquids, there is also the problem of low recovery fees and low efficiency
Patent No.: 200910093300.8 At the same time, the two-phase method is used to recover ionic liquids, but it is difficult to separate impurities such as sugars and proteins from the ionic liquids during the two-phase application process, resulting in low purity of the recovered ionic liquids

Method used

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  • Method for recycling and purifying ionic liquid in mixed solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) In situ degradation of straw by ionic liquid / cellulase: use ionic liquid 1-ethyl-3-methylimidazolium diethylphosphate [EMIM]DEP to treat corn straw at 130°C, cool it in ionic liquid Add water and cellulase enzyme powder to the solution, adjust the pH to 2.0 with ammonia water, so that the final concentration of ionic liquid is 5.0% (v / v), and the final concentration of cellulase is 12.5 FPU / mL.

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

[0020] 3) Recovery and purification o...

Embodiment 2

[0023] 1) Ionic liquid / cellulase in situ enzymatic hydrolysis of straw: use ionic liquid 1-methyl-3-methylimidazolium diethylphosphate ([MMIM]DEP) to treat bagasse at 100°C, after cooling Add citrate buffer and cellulase enzyme powder to the ionic liquid, adjust the pH=4.8, make the final concentration of ionic liquid 20% (v / v), and the final concentration of cellulase 13FPU / mL.

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

[0025] 3) Recovery of ionic liquid by the reverse micellar system: the cellulase in the mixed system of cellulase and ionic liquid (20%, v / v) was removed by the reverse ...

Embodiment 3

[0027] 1) Ionic liquid / cellulase in situ enzymatic hydrolysis of straw: use ionic liquid 1-methyl-3-methylimidazolium diethylphosphate ([MMIM]DEP) to treat bagasse at 100°C, after cooling Add citrate buffer and cellulase enzyme powder to the ionic liquid, adjust the pH=10, make the final concentration of ionic liquid 30% (v / v), and the final concentration of cellulase 13FPU / mL.

[0028] 2) Construction of reverse micellar system: Weigh 0.25g of CTAB, add organic solvent (6.5mL of isooctane, n-hexane

[0029] The amount of alcohol added is 0.2mL) to form an emulsion, and then add 0.15ml of enzyme-containing phosphate buffer at pH 7.5 while shaking to form a uniform, transparent and clear CTAB / isooctane / n-Hexanol reverse micellar system.

[0030]3) Recovery of ionic liquid by the reverse micellar system: the cellulase in the mixed system of cellulase and ionic liquid (30%, v / v) was removed by using the reverse micellar system, in which the amount of the reverse micellar soluti...

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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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