Method for synthesizing methylethyl carbonate

A technology of ethyl methyl carbonate and dimethyl carbonate, which is applied in the field of synthesizing ethyl methyl carbonate using ionic liquid as a catalyst, can solve the problems that the catalyst is not easy to recycle, the product yield is not high, the selectivity is not good, etc., and the service life is reached Long-term, no pollution, high catalytic activity effect

Active Publication Date: 2013-01-02
辽阳东昌化工股份有限公司
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  • Abstract
  • Description
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Problems solved by technology

[0010] The technical problem to be solved in the present invention is aimed at defects such as low product yield, poor selectivity, difficult recycling of the catalyst, and high cost in the synthesis of ethyl methyl carbonate. In order to solve the above problems, the present invention provides a catalytic High activity, high selectivity, and after the reaction, it can be recovered and continued to be recycled after simple treatment, and the method for synthesizing ethyl methyl carbonate with reduced cost

Method used

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  • Method for synthesizing methylethyl carbonate

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Add reaction material dimethyl carbonate and ethanol in the reactor, its molar ratio is 1:1, 1-ethyl-3-ethylimidazolium bromide is used as catalyst, and the amount of catalyst used is the mass of reactant dimethyl carbonate 1%, the reaction temperature is 50°C, and the reaction time is 10h. Under these reaction conditions, the yield of ethyl methyl carbonate is 32.41%, and the selectivity is 74.98%.

Embodiment 2

[0023] Add reaction material dimethyl carbonate and ethanol in the reactor, its molar ratio is 3:1, 1-methyl-3-methylimidazolium chloride salt is used as catalyst, and the amount of catalyst used is the mass of reactant dimethyl carbonate 0.5%, the reaction temperature is 150°C, and the reaction time is 6h. Under these conditions, the yield of ethyl methyl carbonate is 41.27%, and the selectivity is 82.19%.

Embodiment 3

[0025] Add the reaction material dimethyl carbonate and ethanol in the reactor, the molar ratio is 1:1, 1-butyl-3-butylimidazolium hexafluorophosphate is used as the catalyst, and the amount of the catalyst used is the mass of the reactant dimethyl carbonate 1% of 1%, the reaction temperature is 80 ℃, and the reaction time is 10h. Under these reaction conditions, the yield of ethyl methyl carbonate is 12.24%, and the selectivity is 80.35%.

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Abstract

The invention relates to a method for synthesizing methylethyl carbonate. According to the method, under ordinary pressure, dimethyl carbonate and ethanol which are used as raw materials are subjected to synthetic reaction of methylethyl carbonate at certain reaction temperature for some time by using an imidazole ionic liquid as a catalyst. The invention has the following advantages: the catalyst consumption is only 0.5-5 wt% of the dimethyl carbonate; the ionic liquid catalyst has high catalytic activity in the reaction process, the maximum yield of methylethyl carbonate is up to 71.22%, and the selectivity is up to 88.52%; and the catalyst can be recycled for cyclic utilization after being subjected to simple treatment after reaction, has the advantages of long service life and no pollution, and greatly lowers the preparation cost of methylethyl carbonate.

Description

technical field [0001] The present invention relates to a kind of synthetic method of ethyl methyl carbonate, particularly a kind of method that adopts ionic liquid to synthesize ethyl methyl carbonate as catalyst. Background technique [0002] With the rapid development of lithium-ion batteries, the requirements for battery safety and service life are becoming more and more stringent, which brings challenges to the technological innovation of battery electrolytes. At present, the quality of domestically synthesized electrolyte solvents cannot meet the use standards, so electrolyte solvents are generally imported from abroad. In recent years, it has been found that ethyl methyl carbonate can be used as a good electrolyte for lithium-ion batteries. Ethyl methyl carbonate is a A wide range of asymmetric carbonate compounds, mainly used as solvents and intermediates in organic synthesis, when used as electrolyte solvents for lithium-ion batteries, due to its low viscosity, high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/96C07C68/06B01J31/02
CPCY02P20/584
Inventor 薛冰亓虎李永昕许杰
Owner 辽阳东昌化工股份有限公司
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