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Imidazole ionic liquid with high alkali-resistant stability and application of imidazole ionic liquid

A technology of ionic liquids and imidazoles, which is applied in organic chemistry and other fields, can solve the problem of insufficient alkali resistance of anion ion exchange membranes, and achieve the effects of low cost, good alkali resistance stability, and improved alkali resistance stability

Active Publication Date: 2015-02-25
安徽麦基艾迪新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the invention of the present invention is to provide a kind of imidazole ionic liquid with excellent alkali resistance; Another purpose of the invention is to provide a kind of anion exchange membrane based on imidazole ionic liquid, improve the alkali resistance stability of anion exchange membrane , to overcome the problem of insufficient alkali resistance of anion exchange membranes based on imidazole ionic liquids reported so far

Method used

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  • Imidazole ionic liquid with high alkali-resistant stability and application of imidazole ionic liquid
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  • Imidazole ionic liquid with high alkali-resistant stability and application of imidazole ionic liquid

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Embodiment 1

[0025] Alkali resistance test of several ionic liquids: put an appropriate amount of ionic liquid in a deuterated aqueous solution of 1M KOH at 80°C, use nuclear magnetic resonance technology to monitor the structural changes of the ionic liquid in real time, and evaluate by detecting the change of the H spectrum of the ionic liquid Alkali resistance of ionic liquids. Such as Figure 1 to Figure 4 As shown, the four groups of pictures A, B, C, and D respectively represent four kinds of ionic liquids , , , The H-spectrum of each figure, the upper spectral line is the original H-spectrum of the ionic liquid, and the lower spectral line is the H-spectrum after 60 hours of alkali resistance test. figure 1 After the ionic liquid was passed through natron, many miscellaneous peaks appeared in the NMR spectrum, indicating that the ionic liquid was not stable enough in 1M KOH solution at 80°C, and its structure changed. and figure 2 , image 3 , Figure 4 The spectra aft...

Embodiment 2

[0027] Polymerized Ionic Liquids Containing Substituent Groups at the 2-Position of Imidazole Ring Preparation of:

[0028] Under nitrogen protection, add 5.46g (0.05mol) 2-isopropylimidazole, 7.10g (0.05mol) methyl iodide and 5.61g (0.10mol) KOH to a three-necked flask with 40ml of acetonitrile and stir at room temperature for 4 hours , filtered, and rotary evaporated to obtain a crude product, which was dissolved in chloroform, extracted with water, and the chloroform layer was taken, and anhydrous magnesium sulfate was added to remove water, and the rotary evaporated to obtain 5.6 g of the product 1-methyl-2 isopropylimidazole (produced Rate: 90%).

[0029] Under nitrogen protection, 3.10 g (0.025 mol) of 1-methyl-2 isopropylimidazole, 3.82 g (0.025 mol) of vinylbenzyl chloride and 20 ml of ethyl acetate were added to the three-necked flask, and the reaction was carried out in an ice-water bath for 48 hours. The reactant was washed 3 times with ethyl acetate, and vacuum-...

Embodiment 3

[0032] 0.2g, styrene 0.1g, acrylonitrile 0.2g, 0.01g, 0.02g of divinylbenzene, mix the solution evenly, apply it on the mold, polymerize at 75°C for 6 hours, and form a film in situ. The anion exchange membrane was then soaked in 1M KOH solution at 60°C for 24 hours to convert anions into OH - , soaked in deionized water for 24 hours to remove the KOH remaining in the membrane, the obtained OH - type anion exchange membrane, the conductivity at room temperature is 1.14×10 -2 S cm -1 , with an ionic conductivity of 3.53×10 at 60 °C -2 S cm -1 . It is then subjected to an alkali resistance test: soak it to 80 o After 120 hours in 1M potassium hydroxide solution at C, soak in distilled water to remove the residual KOH in the film. The conductivity at room temperature is 1.21×10 -2 S cm -1 , with an ionic conductivity of 3.46×10 at 60 °C -2 S cm -1 .

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Abstract

The invention discloses imidazole ionic liquid with high alkali-resistant stability and application of the imidazole ionic liquid. The ionic liquid has the following chemical structure as shown in the text, wherein m is an integer between 0 to 8, n is an integer between 0 to 6, -R is one of FORMULAE, and X is one of I, Br and Cl. The ionic liquid can be used for preparing an anion exchange polymer membrane. The ionic liquid has high alkali-resistant stability; by using the imidazole ionic liquid, the alkali-resistant stability of the alkali anion exchange membrane is greatly improved; and the imidazole ionic liquid can be applied in the field of alkali fuel cells.

Description

technical field [0001] The invention relates to an imidazole ionic liquid and an anion exchange polymer membrane based on the imidazole ionic liquid. Background technique [0002] Anion exchange membranes are widely used in industrial fields such as water treatment, hydrometallurgy, chemical separation, and alkaline fuel cells. The common preparation method of the traditional polymer anion exchange membrane is to chloromethylate the commercially available polymer, and then carry out reactions such as quaternization and anion exchange. Among them, the highly toxic carcinogen chloromethyl ether will be used in the chloromethylation process, which is very harmful to the environment and the human body. Moreover, the thermal stability and chemical stability of traditional polymer anion exchange membranes are low. Under high temperature or alkaline conditions, the quaternary ammonium groups in the polymer are easily degraded, resulting in a decrease in ion exchange capacity, whic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D233/58C08J7/12C08J5/22C08F226/06C08F220/48C08F220/50C08F212/14C08F212/08C08L33/20C08L39/04C08L25/18C08L25/12
Inventor 严锋林本才
Owner 安徽麦基艾迪新材料科技有限公司
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