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Method for preparing methyl ethyl carbonate through transesterification of dimethyl carbonate and ethyl alcohol

A technology of ethyl methyl carbonate and dimethyl carbonate, which is applied in the field of preparing ethyl methyl carbonate by transesterification of dimethyl carbonate and ethanol, can solve the problems of low selectivity of the product ethyl methyl carbonate, large amount of catalyst and raw materials. Low conversion rate and other problems, to achieve the effects of low raw material toxicity, low pollution, and no corrosion dosage

Active Publication Date: 2018-12-11
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
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Problems solved by technology

[0009] In order to solve the outstanding problems such as large amount of catalyst, long reaction time, low conversion rate of raw materials and low selectivity of product ethyl methyl carbonate in the process of producing ethyl methyl carbonate by transesterification between dimethyl carbonate and ethanol, the purpose of the present invention It is: to develop a method for producing ethyl methyl carbonate through the transesterification reaction of dimethyl carbonate and ethanol, which has the advantages of low toxicity of raw materials, little pollution, mild reaction conditions, no corrosion of catalyst and low consumption, and conversion rate of raw material dimethyl carbonate And the advantages of high selectivity of the product ethyl methyl carbonate

Method used

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  • Method for preparing methyl ethyl carbonate through transesterification of dimethyl carbonate and ethyl alcohol
  • Method for preparing methyl ethyl carbonate through transesterification of dimethyl carbonate and ethyl alcohol
  • Method for preparing methyl ethyl carbonate through transesterification of dimethyl carbonate and ethyl alcohol

Examples

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Effect test

Embodiment 1

[0022] Add 9.0 grams of dimethyl carbonate (Dimethyl Carbonate, DMC for short, 0.1 mol), 18.4 grams of ethanol (0.4 mol), 0.02 grams of titanium glycinate (0.2% of the mass of dimethyl carbonate) into 100 ml of two round tubes equipped with condenser tubes In the bottom flask, stir evenly, be warming up to 80 ℃ and react for 3 hours, the mixture after the reaction is carried out qualitative and quantitative analysis by gas chromatography-mass spectrometry, and the conversion rate of dimethyl carbonate is 90%, ethyl methyl carbonate (Ethyl Methyl Carbonate, EMC for short) selectivity is 91%.

Embodiment 2～8

[0024] The specific methods of Examples 2-8 are similar to those of Example 1, and the specific reaction conditions and results are shown in Table 1. Titanium alanine, titanium proline, titanium isoleucine, titanium leucine, titanium phenylalanine, titanium valine, titanium glutamate are used as catalysts, and the molar ratio of ethanol to dimethyl carbonate is 1 ~4, the reaction temperature is 70~90°C, the reaction time is 1~5 hours, the DMC conversion rate reaches more than 70%, and the EMC selectivity reaches more than 80%.

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Abstract

The invention relates to a method for preparing methyl ethyl carbonate through transesterification of dimethyl carbonate and ethyl alcohol. Dimethyl carbonate and ethyl alcohol are taken as raw materials; one or two of titanium glycine, titanium alanine, titanium proline, titanium isoleucine, titanium leucine, titanium phenylalanine, titanium valine and titanium glutamate are taken as catalysts; the mole ratio of ethyl alcohol to dimethyl carbonate is at 1-4; the dosage of the catalysts is 0.02-0.2% of the mass of dimethyl carbonate; the reaction temperature is at 70-90 DEG C; the reaction time is 1-5 hours; the maximal conversion rate of dimethyl carbonate and the maximal selectivity of methyl ethyl carbonate both can reach up to above 99%. The method disclosed by the invention has the advantages of low toxicity of raw materials, low pollution, mild reaction condition, no corrosion and less dosage of catalysts, high conversion rate of raw material dimethyl carbonate, high selectivityof product methyl ethyl carbonate, and the like.

Description

technical field [0001] The invention belongs to the field of organic chemical industry, and in particular relates to a method for preparing ethyl methyl carbonate through the transesterification reaction between dimethyl carbonate and ethanol. Background technique [0002] Dimethyl carbonate has the advantages of low toxicity, biodegradability, and convenient transportation. It can be used as a carbonylation or methylation reagent to replace highly toxic drugs such as phosgene, methyl chloroformate, and dimethyl sulfate. It is used in the production of poly Carbonate, isocyanate, polyurethane and other chemical products improve the safety of production operations and reduce environmental pollution. Dimethyl carbonate can also be used as a cleaning solvent, replacing traditional solvents such as Freon, trichloroethane, trichloroethylene, benzene, and xylene. However, the current market capacity of dimethyl carbonate is limited, and the development of downstream products of d...

Claims

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Application Information

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IPC IPC(8): C07C68/06C07C69/96
CPCC07C68/06C07C69/96
Inventor 黄义争徐杰高进郑玺孙颖苗虹石松杜文强
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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