Method for preparing cyclic carbonate by catalyzing with ionic liquid

A technology of cyclic carbonate and ionic liquid, applied in the direction of organic chemistry, etc., can solve the problems of high catalyst cost, low catalytic activity, long reaction time, etc.

Active Publication Date: 2012-02-01
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These catalytic systems have more or less problems such as low catalytic activity, use of highly toxic organic solvents, high cost of catalysts, etc.
Although there are many types of catalysts reported, there are still problems such as low reactivity and long reaction time.

Method used

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  • Method for preparing cyclic carbonate by catalyzing with ionic liquid
  • Method for preparing cyclic carbonate by catalyzing with ionic liquid
  • Method for preparing cyclic carbonate by catalyzing with ionic liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020]

[0021] Implementation method: in a 100ml stainless steel autoclave, add 1-methyl-4-hydroxyethyl-1,2,4-triazole bromide (R=CH in the structural formula) successively 3 , R 1 =(CH 2 ) 2 OH, X=Br) 3.0mmol, 14ml propylene oxide (1a) (0.2mol), a closed reactor, filled with 1.0MPa of carbon dioxide, the temperature is controlled by a temperature controller to slowly rise to 110 ° C, and then the reaction pressure is controlled to 2.0 MPa, react for 1.0 hour. After the reaction, the reactor was cooled to 5° C., and excess carbon dioxide was slowly released. After the catalyst was separated by filtration, the product obtained was analyzed by gas chromatography, and the product (2a) was obtained with a selectivity of 99.5% and a yield of 99%.

Embodiment 2

[0023] With embodiment 1, catalyst used is 1-methyl-4-ethyl-1,2,4-triazole bromide (R=CH in the structural formula 3 , R 1 =CH 2 CH 3 , X=Br) 3.0mmol, other conditions remain unchanged, the selectivity of product (2a) is 99.8%, and the yield is 82%.

Embodiment 3

[0025] With embodiment 1, catalyst used is 1-methyl-4-hydroxyethyl-1,2,4-triazole chloride (R=CH in the structural formula 3 , R 1 =CH 2 CH 3 OH, X=Cl) 3.0 mmol, other conditions unchanged, the selectivity of (2a) was 99%, and the yield was 78%.

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Abstract

The invention relates to a method for preparing cyclic carbonate by catalyzing with ionic liquid. The method is characterized in that: addition of an epoxy compound and carbon dioxide is catalyzed by taking 1,2,4-triazole ionic liquid as a catalyst under the condition that the using amount of the catalyst is 0.4-2 molar percent (counted by the content of ionic liquid) based on the using amount ofthe epoxy compound, the reaction pressure is 0.1-10.0MPa, the reaction temperature is 50-150 DEG C and the reaction time is 0.5-8 hours to synthesize corresponding cyclic carbonate. The synthetic method has the characteristics of high catalyst activity, low cost, long service life and the like, and a tertiary amino group contained in 1,2,4-triazole has a concerted catalysis effect possibly.

Description

Technical field: [0001] The invention relates to a method for preparing cyclic carbonate by cycloaddition of epoxy compound and carbon dioxide. Background technique: [0002] Carbon dioxide is a greenhouse gas and an inexhaustible C1 resource. Its effective fixation has become one of the most challenging issues in this century, and the synthesis of cyclic carbonate is one of the best ways to fix carbon dioxide. Atom economy response. Cyclic carbonate is a very good polar solvent, which is widely used in the synthesis of pharmaceutical and fine chemical intermediates. In addition, cyclic carbonates can be hydrolyzed or alcoholyzed to produce bulk chemicals such as glycols and dimethyl carbonate with high selectivity. Compared with the original process, it can effectively reduce production costs and save energy. It has a good application prospect. [0003] Most of the currently reported methods for producing cyclic carbonates use binary homogeneous catalysts consisting of L...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D317/38C07D317/36C07D317/46
Inventor 张锁江陈曦孙剑王金泉成卫国张香平
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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