Method for producing ring carbonic acid ester with hydroxyl ion liquid

A cyclic carbonate and ionic liquid technology, applied in clean catalysis and green fields, can solve problems such as poor stability, low catalytic activity, harsh reaction conditions, etc.

Active Publication Date: 2008-02-27
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, poor stability, harsh reaction conditions, use of highly toxic organic solvents, and high catalyst costs.

Method used

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  • Method for producing ring carbonic acid ester with hydroxyl ion liquid
  • Method for producing ring carbonic acid ester with hydroxyl ion liquid
  • Method for producing ring carbonic acid ester with hydroxyl ion liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024]

[0025] Implementation method: In a 100ml stainless steel autoclave, add 3.2mmol of 1-ethanolyl-3-methylimidazolium bromide and 14ml of propylene oxide (1a) successively, seal the reaction vessel, and fill it with carbon dioxide with an appropriate amount of pressure, controlled by a temperature controller Slowly raise the temperature to 125°C, then control the pressure of carbon dioxide to 2.0MPa, react for 1.0 hour, cool to room temperature, unload the kettle, absorb excess carbon dioxide with saturated sodium carbonate solution, and distill the obtained liquid under reduced pressure to obtain product (2a), gas chromatography Analysis showed that the selectivity of product (2a) was >99.8%, and the yield was 99%.

Embodiment 2

[0027] With embodiment 1, catalyst used is choline chloride 7mmol, and its structural formula is Other conditions remain unchanged, the selectivity of (2a) is 98.5%, and the yield is 80%.

Embodiment 3

[0029] With embodiment 2, catalyst used is choline bromide 3.2mmol, and its structural formula is Other conditions remain unchanged, the selectivity of (2a) is 99%, and the yield is 97%.

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Abstract

The invention discloses a making method of annular carbonate through hydroxy ion liquid, which comprises the following steps: adopting epoxy compound and carbon dioxide as reactant; using catalyst from one of hydroxy ion liquid; making the quantity of catalyst between 1X10-3 and 1. 5X10-2mol corresponding to epoxy compound; setting the reacting pressure at 0. 1-10. 0Mpa under 323. 15-483. 15K for 0. 3-5h; obtaining the product under mild reacting condition. The invention saves cost due to using mono-component catalyst with high selectivity, which displays good water and thermal stability to be used reciprocally.

Description

Technical field: [0001] The invention relates to the technical field of green and clean catalysis, and specifically refers to a method for synthesizing carbonate from carbon dioxide and epoxy compounds by using hydroxyl ionic liquid through cycloaddition reaction. 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 carbonates is one of the best ways to fix it. Cyclic carbonate is a very good polar solvent, and it has been widely used in the synthesis of pharmaceutical and fine chemical intermediates. In particular, the economic value and industrial demand for the preparation of dimethyl carbonate and the synthesis of ethylene glycol from ethylene carbonate as raw materials are increasing. In recent years, research in this area has received more and more attention. [0003] Most of the currently reported production...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D317/12B01J31/02
Inventor 张锁江孙剑成卫国孟震英李谦任俊毅
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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