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Method for synthesizing dimethyl carbonate

A technology of dimethyl carbonate and ethylene carbonate, which is applied in the field of preparation of dimethyl carbonate, can solve the problems of difficulty in catalyst separation and recovery, low yield of product DMC, large amount of catalyst usage, etc., and achieve good catalyst reusability, The effect of mature production technology and convenient product purification

Active Publication Date: 2017-04-26
连云港石化有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved in the present invention is to provide a simple and easy-to-operate method for the problems of complex synthesis process, large amount of catalyst used, high cost, difficulty in catalyst separation and recovery, and low yield of product DMC in the current process of synthesizing DMC by transesterification. , the product is separated from the catalyst easily, the obtained product has high purity, and the method for synthesizing dimethyl carbonate with good catalyst recovery and reuse performance

Method used

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  • Method for synthesizing dimethyl carbonate

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Effect test

Embodiment 1

[0017] In a 100mL autoclave, add methanol 12mL (0.3mol), ethylene carbonate 2.64g (0.03mol), activated carbon (0.26g), and use CO 2 Replace the air in the autoclave twice, and then fill with CO 2 to 0.5Mpa, magnetically stirred and heated, the temperature was raised to 100°C, and the reaction was carried out at this temperature for 6h. After cooling down to room temperature, the reaction solution was centrifuged and analyzed. The conversion rate of ethylene carbonate is 65%, and the selectivity of dimethyl carbonate is 98%.

Embodiment 2

[0019] In a 100mL autoclave, add methanol 12mL (0.3mol), ethylene carbonate 2.64g (0.03mol), activated carbon (0.52g), and use CO 2 Replace the air in the autoclave twice, and then fill with CO 2 to 0.3Mpa, magnetically stirred and heated, the temperature was raised to 160°C, and the reaction was carried out at this temperature for 8h. After cooling down to room temperature, the reaction solution was centrifuged and analyzed. The conversion rate of ethylene carbonate is 97%, and the selectivity of dimethyl carbonate is 99%.

Embodiment 3

[0021] In a 100mL autoclave, add methanol 12mL (0.3mol), ethylene carbonate 2.64g (0.03mol), activated carbon (0.40g), and use CO 2 Replace the air in the autoclave twice, and then fill with CO 2 to 2Mpa, magnetically stirred and heated, the temperature was raised to 140°C, and the reaction was carried out at this temperature for 4h. After cooling down to room temperature, the reaction solution was centrifuged and analyzed. The conversion rate of ethylene carbonate is 85%, and the selectivity of dimethyl carbonate is 96%.

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Abstract

The invention relates to a method for synthesizing dimethyl carbonate. Activate carbon is used as a catalyst, ethylene carbonate and methanol are used as raw materials, and a reaction is carried out in an autoclave at a certain temperature and under a certain pressure. The method is simple to operate, the product and the catalyst can be conveniently separated, the product has high purity, the catalyst has good recycling and reusing performance, and production cost of dimethyl carbonate is greatly reduced.

Description

technical field [0001] The invention relates to the field of preparation of dimethyl carbonate, in particular to a method for transesterifying ethylene carbonate and methanol to synthesize dimethyl carbonate. Background technique [0002] Dimethyl Carbonate (Dimethyl Carbonate, DMC), is a colorless, transparent, slightly odorous, slightly sweet liquid at room temperature, insoluble in water, but miscible with almost all organic solvents such as alcohols, ethers, and ketones . DMC has very low toxicity and was listed as a non-toxic product in Europe in 1992. It is an environmentally friendly chemical raw material that meets the requirements of modern clean technology. Therefore, the synthesis technology of DMC has received extensive attention from the chemical industry at home and abroad. [0003] The original production method of DMC was the phosgene method, which was successfully developed in 1918, but the toxicity and corrosiveness of phosgene limited the application of t...

Claims

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Application Information

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IPC IPC(8): C07C68/06C07C69/96B01J21/18B01J35/10
CPCC07C68/065B01J21/18B01J35/618B01J35/643B01J35/647C07C69/96Y02P20/584
Inventor 薛冰吴晶王少卿柳娜
Owner 连云港石化有限公司
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