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A kind of method of synthesizing dimethyl carbonate

A technology of dimethyl carbonate and ethylene carbonate, applied in the field of preparation of dimethyl carbonate, can solve the problems of complex synthesis process, large catalyst usage, difficulty in separation and recovery of catalysts, etc., and achieves simple synthesis process, energy saving and cost, reduction in product purification, and the effect of catalyst recovery and reusability

Inactive Publication Date: 2016-05-18
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved in the present invention is to provide a simple operation, separation of product and catalyst for problems such as complex synthesis process, large amount of catalyst used, difficulty in catalyst separation and recovery, and low yield of product DMC in the current DMC synthesis process. Convenient, 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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add methanol 12mL (0.3mol), ethylene carbonate 2.64g (0.03mol), graphene oxide (0.26g) successively in a 100mL autoclave, replace the air in the autoclave with argon for 2 times, and then fill with argon to 0.5Mpa, magnetic stirring and heating, 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 was 78%, and the selectivity of dimethyl carbonate was 92%.

Embodiment 2

[0021] Add methanol 12mL (0.3mol), ethylene carbonate 2.64g (0.03mol), graphene oxide (0.26g) successively in a 100mL autoclave, replace the air in the autoclave with argon for 2 times, and then fill with argon to 1Mpa, heated with magnetic stirring, raised the temperature to 100°C, and reacted 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 81%, and the selectivity of dimethyl carbonate is 94%.

Embodiment 3

[0023] Add methanol 12mL (0.3mol), ethylene carbonate 2.64g (0.03mol), graphene oxide (0.26g) successively in a 100mL autoclave, replace the air in the autoclave with argon for 2 times, and then fill with argon to 1Mpa, heated with magnetic stirring, raised the temperature to 140°C, and reacted 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 87%, and the selectivity of dimethyl carbonate is 95%.

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Abstract

The invention relates to a dimethyl carbonate synthesis method. The method is characterized in that graphene oxide is used as a catalyst, ethylene carbonate and methanol are used as raw materials, and the synthesis is carried out in an autoclave under a certain temperature and a certain pressure. The method has the advantages of simplicity in operation, convenience in separating a product from the catalyst, high purity of the obtained product, as well as high recovery and reuse performances of the catalyst; the dimethyl carbonate production cost can be greatly reduced, and the product grade can be improved.

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 (DimethylCarbonate, 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 this ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C68/06C07C69/96
CPCC07C68/065C07C69/96
Inventor 李永昕徐莽薛冰柳娜许杰
Owner CHANGZHOU UNIV
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