Method for synthetising methyl ethyl carbonate by exchange of diethyl carbonate and methanol ester

A technology of ethyl methyl carbonate and diethyl carbonate, which is applied in the field of synthesizing ethyl methyl carbonate by 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, and the service life is achieved. Long, pollution-free, high catalytic activity

Active Publication Date: 2013-01-02
CHANGZHOU XIAOGUO INFORMATION SERVICES
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 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,

Method used

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  • Method for synthetising methyl ethyl carbonate by exchange of diethyl carbonate and methanol ester

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Embodiment 1

[0016] The reaction material diethyl carbonate and methanol are added into the reactor, the molar ratio is 1:1, 1-ethyl-2-methyl-3-ethylimidazolium bromide is used as a catalyst, and the amount of catalyst used is the reactant carbonic acid 1% of the mass of diethyl ester, the reaction temperature is 80°C, and the reaction time is 10h. Under these reaction conditions, the yield of ethyl methyl carbonate is 33.54%, and the selectivity is 76.71%.

Embodiment 2

[0018] The reaction material diethyl carbonate and methanol are added into the reactor, the molar ratio is 3:1, 1-methyl-2-butyl-3-methylimidazolium chloride is used as a catalyst, and the amount of catalyst used is the reactant carbonic acid The mass of diethyl ester is 2%, the reaction temperature is 120°C, and the reaction time is 16h. Under these reaction conditions, the yield of ethyl methyl carbonate is 51.33%, and the selectivity is 72.14%.

Embodiment 3

[0020] Add reaction materials diethyl carbonate and methanol into the reactor, the molar ratio is 1:1, 1-butyl-2-ethyl-3-butylimidazolium hexafluorophosphate is used as catalyst, the amount of catalyst used is reactant The mass of diethyl carbonate is 4%, the reaction temperature is 100°C, and the reaction time is 20h. Under these reaction conditions, the yield of ethyl methyl carbonate is 17.24%, and the selectivity is 81.23%.

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Abstract

The invention relates to a method for synthetising methyl ethyl carbonate by exchange of diethyl carbonate and methanol ester. The method includes that under normal pressure, the diethyl carbonate and methanol are taken as raw materials, imidazolium ionic liquids are taken as catalysts, and synthetic reaction of the methyl ethyl carbonate is performed at a certain reaction temperature and in a certain reaction time. Usage amount of the catalysts only accounts for 1-5% of the mass of the diethyl carbonate, the ionic liquids serving as the catalysts are high in catalytic activity during reaction, the yield of the methyl ethyl carbonate can ultimately reach 68.15%, selectivity can reach 85.39%, the diethyl carbonate can be recovered for continuous cyclic utilization by simple treatment after the reaction, and the methyl ethyl carbonate is long in service life and free of any pollution, so that cost for preparation of the methyl ethyl carbonate is greatly lowered.

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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IPC IPC(8): C07C69/96C07C68/06B01J31/02
Inventor 李永昕郭静薛冰亓虎许杰
Owner CHANGZHOU XIAOGUO INFORMATION SERVICES
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