Method for preparing dimethyl carbonate

A technology of dimethyl carbonate and alkylene carbonate, applied in chemical instruments and methods, preparation of organic compounds, preparation of carbonate/haloformate, etc., can solve the problem of low activity or selectivity, decreased activity, Not resistant to swelling and other problems, to achieve the effect of high selectivity, stable properties, and not easy to lose

Active Publication Date: 2021-03-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alkali metal or alkali metal salt loaded on the carrier, such as KF / Al 2 o 3 , NaOH / chitosan and Cs 2 CO 3 / SiO 2 -Al 2 o 3 etc. (H.Zhang, CN101249452; Y.Zhao, CN101121147; C.D.Chang et al., WO0156971A1), their disadvantage is that they are easily affected by water and CO in the air 2 The impact of the activity decreases; metal oxide catalysts, such as Al 2 o 3 , MgO, etc. (B.M.Bhanage, et al.Appl.Catal.A 219 (2001) 259-266; J.S.Buchanan et al., US2005080287; Z.Z.Jiang et al., US6207850), and alkali (earth) metal exchanged zeolites or Clay materials, such as Cs-ZSM-5, Mg-smectite, etc. (C.D.Chang et al., WO0073256; B.M.Bhanage et al.Catal.Lett.83(2002) 137-141), the disadvantage of these two types of catalysts is activity or selection Ion exchange resin, such as quaternary ammonium type or tertiary amine type resin (J.F.Knifton et al., J.Mol.Catal.A 67 (1991) 389-399; M.Cao et al.React.Kinet. Catal.Lett.88 (2006) 251-259), this type of catalyst is usually not temperature-resistant, not resistant to swelling, and the activity decreases rapidly for a long time

Method used

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  • Method for preparing dimethyl carbonate

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Experimental program
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Effect test

Embodiment 1

[0022] 22.0 grams of ethylene carbonate, 32.0 grams of methyl alcohol and 0.22 grams of catalyst magnesium silicide were placed in a 100 milliliter autoclave (the mol ratio of methanol to alkylene carbonate was 4:1, and the weight ratio of catalyst to ethylene carbonate was 0.01: 1), react at 120°C for 2 hours. After the reaction, the autoclave was cooled to room temperature and vented. The liquid phase product was taken for gas chromatography analysis, and the conversion rate of ethylene carbonate was 62.5%, the selectivity of dimethyl carbonate was 99.8%, and the selectivity of ethylene glycol was 99.8%.

Embodiment 2

[0024] 22.0 grams of ethylene carbonate, 32.0 grams of methyl alcohol and 0.22 grams of catalyst magnesium silicide were placed in a 100 milliliter autoclave (the mol ratio of methanol to alkylene carbonate was 4:1, and the weight ratio of catalyst to ethylene carbonate was 0.01: 1), react at 100°C for 4 hours. After the reaction, the autoclave was cooled to room temperature and vented. The liquid phase product was taken for gas chromatography analysis, and the conversion rate of ethylene carbonate was 62.3%, the selectivity of dimethyl carbonate was 99.8%, and the selectivity of ethylene glycol was 99.8%.

Embodiment 3

[0026] 11.0 grams of ethylene carbonate, 32.0 grams of methyl alcohol and 0.55 grams of catalyst magnesium silicide were placed in a 100 milliliter autoclave (the mol ratio of methanol to alkylene carbonate was 8:1, and the weight ratio of catalyst to ethylene carbonate was 0.05: 1), react at 120°C for 2 hours. After the reaction, the autoclave was cooled to room temperature and vented. The liquid phase product was taken and analyzed by gas chromatography, and the conversion rate of ethylene carbonate was 80.6%, the selectivity of dimethyl carbonate was 99.9%, and the selectivity of ethylene glycol was 99.8%.

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Abstract

The invention relates to application of magnesium silicide and / or lithium carbide as a catalyst in transesterification reactions, in particular in the production of dimethyl carbonate. The invention further provides a method for preparing dimethyl carbonate, which comprises the step of contacting alkylene carbonate and methanol with a catalyst, wherein the catalyst comprises magnesium silicide and / or lithium carbide. According to the method provided by the invention, the magnesium silicide and / or lithium carbide catalyst is adopted, so that the problems of low heterogeneous catalyst activity and easy loss of active components in transesterification in the prior art are solved. The catalyst provided by the invention is used for preparing dimethyl carbonate through transesterification of alkylene carbonate and methanol, and the conversion rate and selectivity of alkylene carbonate are relatively high.

Description

technical field [0001] The invention relates to a method for preparing dimethyl carbonate through transesterification of alkylene carbonate and methanol. Background technique [0002] Dimethyl carbonate (DMC) has lively chemical properties, excellent physical properties, and is non-toxic and easy to biodegrade. Electrolyte and carbonylation, methylation and carbonyl methoxylation reagents are widely used in the field of chemical industry. At present, all countries are actively studying the green chemical process based on DMC, an environmentally friendly chemical raw material. Among them, the transesterification method is superior to the mild reaction conditions, high yield and co-production of ethylene glycol or propylene glycol, so it has become a method with great industrial prospects. [0003] Generally speaking, alkali metal hydroxides, alkali metal carbonates and alkali metal alcohols (F.Risse et al., US2011040117, C.P.Allais et al., WO2010063780) are used as catalysts...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C68/065C07C69/96B01J27/22B01J21/10
CPCC07C68/065B01J27/22B01J21/10C07C69/96
Inventor 戈军伟何文军王意
Owner CHINA PETROLEUM & CHEM CORP
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