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A method for removing impurity ions in an ionic liquid aqueous solution system

A technology of ionic liquid and impurity ions, which is applied in separation methods, general water supply conservation, chemical instruments and methods, etc., can solve the problem that impurity ions are rarely reported, and achieve good application prospects, improve effective separation efficiency, and efficient recovery.

Active Publication Date: 2022-05-13
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In summary, there are few reports on the process of removing impurity ions in ionic liquid aqueous solutions.

Method used

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  • A method for removing impurity ions in an ionic liquid aqueous solution system
  • A method for removing impurity ions in an ionic liquid aqueous solution system

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Embodiment 1

[0038] This embodiment provides a method for removing impurity ions in an ionic liquid aqueous solution system. The ionic liquid in the ionic liquid aqueous solution to be purified is alkylimidazolium salt 1-ethyl-3 methylimidazole diethyl phosphate salt, and the impurity ion is potassium Ions, a mixture of sodium ions, calcium ions, magnesium ions, and copper ions, the positive membrane used is a sulfonic acid type cation exchange membrane CIMS, and the negative membrane is a quaternary ammonium type anion exchange membrane AGU;

[0039] Specific steps are as follows:

[0040] (1) 500mL ionic liquid concentration is 20g / L, impurity ion concentration is respectively the ionic liquid aqueous solution to be purified of 0.5g / L and is passed into the desalination chamber of electrodialysis device, with flow rate being 30L / (min·m 2 ) to cycle;

[0041] (2) 500mL of water (that is, the concentration of the ionic liquid is 0g / L) is entered into the concentration chamber of the elect...

Embodiment 2

[0047] This embodiment provides a method for removing impurity ions in an ionic liquid aqueous solution system. The ionic liquid in the sample to be treated is alkylimidazolium salt 1-ethyl-3 methylimidazole diethyl phosphate salt, and the impurity ion is potassium ion. A mixture of sodium ions, calcium ions, and magnesium ions, the cationic membrane used is a sulfonic acid-type cation-exchange membrane CIMS, and the anion-membrane is a quaternary ammonium-type anion-exchange membrane AGU;

[0048] Specific steps are as follows:

[0049] (1) 500mL ionic liquid concentration is 20g / L, impurity ion concentration is respectively the ionic liquid aqueous solution to be purified of 0.5g / L and is passed into the desalination chamber of electrodialysis device, with flow rate being 30L / (min·m 2 ) to cycle;

[0050] (2) 500mL of water (that is, the concentration of the ionic liquid is 0g / L) is entered into the concentration chamber of the electrodialysis device as a concentrated solut...

Embodiment 3

[0056] This embodiment provides a method for removing impurity ions in an ionic liquid system. The ionic liquid in the aqueous ionic liquid solution to be purified is alkylimidazolium salt 1-ethyl-3-methylimidazole diethyl phosphate salt, and the impurity ion is sodium ion , a mixture of magnesium ions, the positive membrane used is a sulfonic acid type cation exchange membrane CIMS, and the negative membrane is a quaternary ammonium type anion exchange membrane AGU;

[0057] Specific steps are as follows:

[0058] (1) 500mL ionic liquid concentration is 20g / L, impurity ion concentration is respectively the ionic liquid aqueous solution to be purified of 0.5g / L and is passed into the desalination chamber of electrodialysis device, with flow rate being 30L / (min·m 2 ) to cycle;

[0059] (2) 500mL of water (that is, the concentration of the ionic liquid is 0g / L) is entered into the concentration chamber of the electrodialysis device as a concentrated solution at a flow rate of 3...

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Abstract

The invention provides a method for removing impurity ions in an ionic liquid system. The method comprises: sequentially passing an aqueous ionic liquid solution containing impurity ions through a first-stage electrodialysis device, a second-stage electrodialysis device, and a third-stage electrodialysis device The high-valent impurity ions, small charge-to-mass ratio monovalent impurity ions and large charge-to-mass ratio monovalent impurity ions are removed in sequence to obtain a purified ionic liquid aqueous solution. The effective separation rate of ionic liquid and impurity ions is improved by adopting a three-stage electrodialysis method. The removal method provided by the invention effectively separates the ionic liquid and impurity ions, obtains a purified ionic liquid, does not produce three industrial wastes, and is an efficient and environmentally friendly removal process; and the method is simple to operate and low in energy consumption , high efficiency, can remove impurity ions in different kinds of ionic liquid aqueous solution systems, is a universal and strong removal method, and is easy to be popularized in large-scale industrialization.

Description

technical field [0001] The invention belongs to the technical field of ionic liquid recovery and treatment, and in particular relates to a method for removing impurity ions in an ionic liquid aqueous solution system. Background technique [0002] Ionic liquids have a series of excellent characteristics, such as strong polarity, non-volatility, and designable structure. Using ionic liquids as green solvents has broad application prospects in industry, including ionic liquids as solvents for extraction and separation of heavy metals, recovery of n-butyl alcohol, purified taurine, etc. Ionic liquids also have good applications in the process of dissolving cellulose. Ionic liquids dissolve natural polymer compounds, and after regeneration and processing, a variety of products can be obtained, which are widely used in various fields. However, in the process of ionic liquid dissolving cellulose, there is a small amount of cellulose degradation phenomenon, and because cellulose co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/469C02F101/10
CPCC02F1/4693C02F2101/10Y02A20/124
Inventor 王均凤张珊珊王道广聂毅张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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