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Process of enriching ionic liquid from water solution

A technology of ionic liquid and aqueous solution, which is applied in the field of ionic liquid enrichment process, can solve the problems of high energy consumption and high cost of removing water, and achieve the effects of low cost, easy operation and large processing capacity

Inactive Publication Date: 2008-07-30
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention overcomes the defects of high energy consumption and high cost of existing distillation to remove water

Method used

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  • Process of enriching ionic liquid from water solution
  • Process of enriching ionic liquid from water solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: K 3 PO 4 Recovery of [C in aqueous solution 4 mim]Cl

[0026] 1) Add 10 g of 10% [C 4 mim]Cl aqueous solution, then add 4g, 5g, 6g, 7g and 8gK 3 PO 4 , the corresponding sample numbers are 1-5 respectively, placed on a vortex mixer and shaken for 5 minutes to dissolve and mix evenly, and stand to form an upper phase and a lower phase two-phase aqueous system; 2) Use a separatory funnel to separate the two phases, Evaporate the upper ionic liquid-rich phase at normal pressure at 60°C for 72 hours to remove water and precipitate the salt crystals contained in the upper phase, then dry it in vacuum at 50°C for 24 hours to obtain pure ionic liquid, recovery of ionic liquid The efficiency results are listed in Table 1; 3) Lower the temperature of the salt-rich phase of the lower phase to 0 °C to form a new two-phase system, and the remaining ionic liquid is enriched in the upper phase, and repeat step 2) to obtain a pure ionic liquid again . Repeat step 3),...

Embodiment 2

[0037] Example 2: K 2 HPO 4 Recovery of [C in aqueous solution 4 mim]Cl

[0038] According to the method of Example 1, but add 5g, 6g, 7g, 8g K 2 HPO 4 , the corresponding sample numbers are 6-9, K 2 HPO 4 Mass pair [C 4 The impact results of mim]Cl recovery are listed in Table 3.

[0039] Table 3K 2 HPO 4 The quality of [C 4 Effect of mim]Cl recovery

[0040] Numbering

[0041] From Table 3 we can see that when K 2 HPO 4 When the quality of the ionic liquid is 5.0514g and 6.0206g, the recovery rate of the ionic liquid is 83.01% and 95.34%, and the temperature of the lower phase salt-rich phase of the No. 6 and No. 7 samples is lowered to 0 ° C or -20 ° C, and the double water phase is formed. system, adopt the same analysis method, and the results of the determination of recovery are listed in Table 4.

[0042] Table 4K 2 HPO 4 Multi-stage enrichment [C 4 recovery of mim]Cl

[0043] Numbering

[0044] From Table 4, we can see that the t...

Embodiment 3

[0045] Example 3: K 2 CO 3 Recovery of [C in aqueous solution 4 mim]Cl

[0046] According to the method of Example 1, but adding 4g, 5g, 6g, 7g and 8g K 2 CO 3 , the corresponding sample numbers are 10-14, K 2 CO 3 Mass pair [C 4 The impact results of mim]Cl recovery are listed in Table 5.

[0047] Form 5K 2 CO 3 The quality of [C 4 Effect of mim]Cl recovery

[0048] Numbering

[0049] From Table 5 we can see that when K 2 CO 3 When the mass of the ionic liquid was 5.0419g and 6.0614g, the recovery rate of the ionic liquid was 90.96% and 96.59%, and the temperature of the lower salt-rich phase of the No. 11 and No. 12 samples was lowered to 0 ° C or -20 ° C, and the double water phase was formed. system, adopt the same analysis method, and the results of the determination of recovery are listed in Table 6.

[0050] Table 6K 2 CO 3 Multi-stage enrichment [C 4 recovery of mim]Cl

[0051] Numbering

[0052] From Table 6, we can see that the...

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Abstract

The present invention relates to process of enriching ionic liquid from water solution. Ionic liquid and salt in water solution may form a double water phase system, including the upper rich ionic liquid phase capable of enriching ionic liquid in water solution. By means of lowering the temperature of lower rich salt phase to 0 deg.c to -20 deg.c, a new double water phase system may be formed for further enriching ionic liquid. The present invention can reach total ionic liquid recovering rate up to 95-99 % and required water evaporating quantity only about 10 % of conventional process. The present invention can recover and reuse ionic liquid and salt, and has the advantages of great treating amount, simple apparatus, easy operation, low cost, easy combination of several stages, high economic benefit and environment friendship.

Description

technical field [0001] The invention relates to an ion liquid enrichment process in aqueous solution. Background technique [0002] As a molten salt at room temperature, room temperature ionic liquids have attracted widespread attention due to their unique excellent solvent properties, strong polar properties, and non-volatile properties. They are widely used in chemical synthesis, electrochemistry, extraction and separation, and material preparation. Applications are increasingly attracting the attention of the world. [0003] At present, ionic liquids are expensive and contain halogens and organic cations. Direct discharge will pollute the environment to a certain extent. Therefore, the effective recovery and recycling of ionic liquids is an important part of their industrial application. Blanchard et al. (Blanchard L A, Hancu D, Beckman E J, et al. [J]. Nature, 1999, 399, 28) investigated supercritical CO 2 From [C 4 mim][PF 6 In the case of back-extracting naphthalen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D11/04B01D17/02
Inventor 陈继邓岳锋张冬丽
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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