Method for preparing achromatic imidazole ionic liquids

An ionic liquid and imidazole technology, which is applied in the field of preparation of colorless imidazole ionic liquids, can solve the problems of complex operation, high cost, inability to meet large-scale application requirements, etc. Effect

Inactive Publication Date: 2009-07-29
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above methods are complicated to operate, high in cost, and cannot meet the requirements of large-scale applications. People are still actively exploring a simple, economical, mild, and environmentally friendly method for colorless ionic liquids.

Method used

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  • Method for preparing achromatic imidazole ionic liquids
  • Method for preparing achromatic imidazole ionic liquids
  • Method for preparing achromatic imidazole ionic liquids

Examples

Experimental program
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Effect test

Embodiment 1

[0012] When n=2, the bromoalkane is bromoethane. Mix ethyl bromide and 1-methylimidazole at a volume ratio of 1:1, add solvent water to it, the volume ratio of water to the above mixture is 0.2:1, and reflux at 40°C for 12 hours under nitrogen protection. The unreacted bromoethane in the lower layer was removed, and the water and unreacted bromoethane in the product were removed by vacuum distillation at 40°C for 10 h to obtain colorless 1-ethyl-3-methylimidazolium bromide.

Embodiment 2

[0014] When n=2, the bromoalkane is bromoethane. Mix ethyl bromide and 1-methylimidazole at a volume ratio of 3:1, add solvent water to it, the volume ratio of water to the above mixture is 0.2:1, and reflux at 40° C. for 12 hours under nitrogen protection. The unreacted bromoethane in the lower layer was removed, and the water and unreacted bromoethane in the product were removed by vacuum distillation at 40°C for 10 h to obtain colorless 1-ethyl-3-methylimidazolium bromide.

Embodiment 3

[0016] When n=2, the bromoalkane is bromoethane. Mix ethyl bromide and 1-methylimidazole at a volume ratio of 6:1, add solvent water to it, the volume ratio of water to the above mixture is 0.2:1, and reflux at 40° C. for 12 hours under nitrogen protection. The unreacted bromoethane in the lower layer was removed, and the water and unreacted bromoethane in the product were removed by vacuum distillation at 40°C for 10 h to obtain colorless 1-ethyl-3-methylimidazolium bromide.

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Abstract

The invention aims at providing a method for preparing colorless imidazole ion liquid. The colorless imidazole ion liquid is 1-alkyl-3-methyl imidazole bromine, and a general formula of the ion liquid is as above. The preparation method uses water as solvent, thereby reducing the use of organic solvent and achieving the goal of being friendly to the environment. Under the protection of nitrogen, a reaction product is dissolved in water to remove brominated alkane which does not react at an underlayer for recycling; and the water in the reaction product and the residual brominated alkane are removed by decompressing and distilling to obtain the colorless 1-alkyl-3-methyl imidazole bromine ion liquid. A reaction mixture is colorless during the whole reaction process, the obtained product of the imidazole ion liquid is also colorless, and subsequent decolorization and purification treatment is not required, thereby greatly reducing the nondeterminacy and the limit of the ion liquid in the application.

Description

technical field [0001] The invention relates to a preparation method of a colorless imidazole ionic liquid. Background technique [0002] As an environmentally friendly solvent, ionic liquids have been widely used in the fields of separation, reaction, and electrochemistry. Ionic liquids including 1,3-dialkylimidazolium salts have irreplaceable advantages of other organic solvents. But ionic liquids The liquid synthesis process is often not green, and toxic and environmentally polluting organic solvents such as toluene are often used in the preparation process. Most ionic liquids should be colorless in theory, but they are colored when synthesized. After two centuries of research, people still have not given a clear explanation for the reason for the color of ionic liquids. For example, 1,3-dialkylimidazolium halides, which are often used as raw materials for the synthesis of other ionic liquids, are usually yellow or dark brown, although they are characterized by high pur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D233/58
Inventor 牛利沈艳飞李斐张齐贤韩冬雪
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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