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Preparation method of diethyl carbonate and methylethyl carbonate

A technology of diethyl carbonate and methyl ethyl carbonate, applied in the field of preparation of diethyl carbonate and methyl ethyl carbonate, can solve problems such as increased energy consumption, and achieve the effect of low energy consumption

Active Publication Date: 2014-05-21
东营石大胜华新材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Diethyl carbonate and ethyl methyl carbonate are chemical products with a very broad market prospect. The commonly used preparation method is to prepare diethyl carbonate and methyl ethyl carbonate by batch reaction distillation technology using dimethyl carbonate (DMC) and methanol as raw materials. Grease, the preparation method of this intermittent rectification is because raw material is put into the rectifying tower in batches, and after the tower still product drops to a certain value, it is discharged at one time, so in the process of actually preparing diethyl carbonate and ethyl methyl carbonate, To keep the purity of the top product components constant, the reflux ratio must be continuously increased, and the energy consumption will also increase accordingly

Method used

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  • Preparation method of diethyl carbonate and methylethyl carbonate
  • Preparation method of diethyl carbonate and methylethyl carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The raw materials dimethyl carbonate (DMC) and absolute ethanol (EA) are continuously added to the first rectification tower at a mass ratio of 3:1, and the catalyst to raw material mass ratio is 10:100 for reactive rectification. The temperature of the tower kettle is controlled at 80°C;

[0035] Add the material from the bottom of the first rectification tower to the second rectification tower for reactive rectification. The temperature of the bottom of the second rectification tower is controlled at 115°C; the bottom of the second rectification tower gets the product diethyl carbonate Fat(DEC);

[0036] Add the material from the top of the second rectification tower to the third rectification tower for reactive rectification, the temperature of the bottom of the third rectification tower is controlled at 100°C; the bottom of the third rectification tower gets the product ethyl methyl carbonate (EMC).

[0037] Excessive raw material dimethyl carbonate leads to a hig...

Embodiment 2

[0039] The raw materials dimethyl carbonate (DMC) and absolute ethanol (EA) are continuously added to the first rectification tower at a mass ratio of 1:0.5, catalyst to raw material at a mass ratio of 1:200 for reactive rectification. The temperature of the tower bottom is controlled at 100°C, and the temperature of the top of the first rectification tower is controlled at 63°C;

[0040] Add the material from the bottom of the first rectification tower to the second rectification tower for reactive rectification. The temperature of the bottom of the second rectification tower is controlled at 130°C; the bottom of the second rectification tower gets the product diethyl carbonate Fat(DEC);

[0041] Add the material from the top of the second rectification tower to the third rectification tower for reactive rectification, the temperature of the bottom of the third rectification tower is controlled at 115°C; the bottom of the third rectification tower gets the product ethyl methy...

Embodiment 3

[0044] The raw materials dimethyl carbonate (DMC) and absolute ethanol (EA) are continuously added to the first rectification tower at a mass ratio of 1:1, and the mass ratio of catalyst to raw materials is 1:20 for reactive rectification. The temperature of the tower bottom is controlled at 90°C, and the temperature of the top of the first rectification tower is controlled at 65°C;

[0045] Add the material from the bottom of the first rectification tower to the second rectification tower for reactive distillation. The temperature of the bottom of the second rectification tower is controlled at 120°C, and the temperature at the top of the second rectification tower is controlled at 95°C. , the product diethyl carbonate (DEC) is obtained from the tower still of the second rectification tower;

[0046]Add the material from the top of the second rectification tower to the third rectification tower for reactive rectification, the temperature of the bottom of the third rectificati...

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Abstract

The invention relates to the field of production of chemical products, and particularly relates to a preparation method of diethyl carbonate and methylethyl carbonate. The preparation method comprises the following steps: continuously adding the raw materials including dimethyl carbonate, absolute ethyl alcohol and a catalyst into a first rectifying tower for reactive rectification, wherein the temperature of a tower kettle is controlled to be 80-100 DEG C; adding a substance discharged from the tower kettle of the first rectifying tower into a second rectifying tower for reactive rectification to obtain a diethyl carbonate product, wherein the temperature of the tower kettle is controlled to be 115-130 DEG C; adding the substance discharged from the top of the second rectifying tower into a third rectifying tower for reactive rectification to obtain a methylethyl carbonate (EMC) product, wherein the temperature of the tower kettle is controlled to be 100-115 DEG C. The preparation method provided by the invention is used for preparing diethyl carbonate and methylethyl carbonate by adopting a continuous reactive rectification process, and the parameters such as the operation ratio, the reflux ratio and the like of the rectifying tower need not to be changed after being determined during the whole operation process as long as the feeding process is well controlled, therefore, the energy consumption is relatively low.

Description

technical field [0001] The invention relates to the field of chemical product production, in particular to a preparation method of diethyl carbonate and ethyl methyl carbonate. Background technique [0002] Diethyl carbonate and ethyl methyl carbonate are chemical products with a very broad market prospect. The commonly used preparation method is to prepare diethyl carbonate and methyl ethyl carbonate by batch reaction distillation technology using dimethyl carbonate (DMC) and methanol as raw materials. Grease, the preparation method of this intermittent rectification is because raw material is put into the rectifying tower in batches, and after the tower still product drops to a certain value, it is discharged at one time, so in the process of actually preparing diethyl carbonate and ethyl methyl carbonate, To keep the purity of the top product components constant, the reflux ratio must be continuously increased, and the energy consumption will also increase accordingly. ...

Claims

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Application Information

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IPC IPC(8): C07C27/00C07C68/06C07C69/96C07C31/04C07C29/128
CPCC07C29/128C07C68/06C07C69/96C07C31/04Y02P20/10
Inventor 于海明韩晔丁伟涛贾风雷郭建军胡强冯杰张良宾杨鹏飞郝春明
Owner 东营石大胜华新材料有限公司
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