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Preparation method of diethyl carbonate and methyl ethyl carbonate mixed ester

A technology of ethyl methyl carbonate and diethyl carbonate, applied in the field of organic solvent preparation, can solve problems such as environmental pollution, impact on personal safety and human health, and achieve the effect of reducing harm to human health

Inactive Publication Date: 2009-03-11
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the use of a large amount of organic solvents in traditional paint and paint industries, volatile organic compounds including linear hydrocarbons, halogenated hydrocarbons, aromatic hydrocarbons and aldehydes, ketones and alcohols will be produced, causing environmental pollution and seriously affecting personal safety and human beings. healthy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Measure dimethyl carbonate and ethanol according to the molar ratio of 1:1.2, then divide the mass of ethanol into two parts, one part is mixed with dimethyl carbonate and sodium methoxide-methanol solution, and then added to the reactive distillation from the top of the tower Tower, wherein the addition of sodium methylate-methanol solution is 2.0% of the total mass of raw material dimethyl carbonate and ethanol, and the speed of addition is controlled to ensure that the residence time of the above liquid in the tower is 1.5 hours; another part of ethanol is directly from the tower still join in. Before the above raw material solution is added to the reactive distillation tower, solid magnesium oxide is added to the tower still of the reactive distillation tower, and its addition amount is 2.0% of the total mass of raw materials dimethyl carbonate and ethanol. Other operating conditions of the reactive distillation tower are as follows: the temperature of the bottom of...

Embodiment 2

[0021] Measure dimethyl carbonate and ethanol according to the molar ratio of 1:1.4, and then divide the ethanol into two parts, one part is mixed with dimethyl carbonate and sodium methoxide-methanol solution and added to the reactive distillation from the top of the tower Tower, wherein the addition of sodium methylate-methanol solution is 2.3% of the total mass of raw material dimethyl carbonate and ethanol, and the speed of addition is controlled to ensure that the residence time of the above liquid in the tower is 2.0 hours; another part of ethanol is directly from the tower still join in. Before the raw material solution is added to the reactive distillation tower, solid magnesium oxide is added to the tower still of the reactive distillation tower, and its addition amount is 1.0% of the total mass of raw materials dimethyl carbonate and ethanol. Other operating conditions of the reactive distillation tower are as follows: the temperature of the bottom of the tower is co...

Embodiment 3

[0023] Measure dimethyl carbonate and ethanol according to the molar ratio of 1:1.6, and then divide the ethanol into two parts, one part is mixed with dimethyl carbonate and sodium methoxide-methanol solution and added to the reactive distillation from the top of the tower tower, wherein the addition of sodium methylate-methanol solution is 1.8% of the total mass of raw material dimethyl carbonate and ethanol, and the speed of addition is controlled to ensure that the residence time of the above liquid in the tower is 2.5 hours; another part of ethanol is directly from the tower still join in. Before the raw material solution is added to the reactive distillation tower, solid magnesium oxide is added to the bottom of the reactive distillation tower in an amount of 0.1% of the total mass of the raw materials dimethyl carbonate and ethanol. Other operating conditions of the reactive distillation tower are as follows: the temperature of the bottom of the tower is controlled at 1...

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Abstract

The invention relates to a method for preparing mixed ester of diethyl carbonate and methyl ethyl carbonate. Raw materials consist of methyl carbonate and ethanol; a catalyst consists of sodium methoxide-methanol solvent with 20 percent of the sodium methoxide in mass percentage; ethanol is equally divided into two parts according to the mass, wherein one part of the ethanol is added to a reaction rectifying tower from the tower top after the part of the ethanol is mixed with the methyl carbonate and the sodium methoxide-methanol solvent, while the other part of the ethanol and solid magnesia are directly added to the reaction rectifying tower from the tower bottom. The mol ratio of the methyl carbonate to the ethanol is between 1 to 1.2 and 1 to 1.6; the addition amount of the sodium methoxide-methanol solvent is 1.8 to 2.3 percent of total mass of the raw materials of the methyl carbonate and the ethanol; and the addition amount of the solid magnesia is 0.1 to 2.0 percent of total mass of the raw materials of the methyl carbonate and the ethanol. The method produces a mixed ester product of the diethyl carbonate and the methyl ethyl carbonate in certain proportion by controlling the mixture ratio of raw material solution, the adding mode of the ethanol and the catalyst, and temperature control of the tower bottom and other conditions.

Description

technical field [0001] The invention relates to a method for preparing an organic solvent, in particular to a method for preparing diethyl carbonate and ethyl methyl carbonate mixed ester from dimethyl carbonate and ethanol through transesterification. Background technique [0002] Due to the use of a large amount of organic solvents in traditional paint and paint industries, volatile organic compounds including linear hydrocarbons, halogenated hydrocarbons, aromatic hydrocarbons and aldehydes, ketones and alcohols will be produced, causing environmental pollution and seriously affecting personal safety and human beings. healthy. Diethyl carbonate and ethyl methyl carbonate are environmentally friendly green and environmentally friendly chemical raw materials, which can replace various industrial solvents in coatings, paints and other industries, and have broad application prospects. [0003] The current main purpose of utilizing the transesterification method to produce is...

Claims

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Application Information

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IPC IPC(8): C07C69/96C07C68/06
Inventor 刘涉江王红星
Owner TIANJIN UNIV
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