Method of producing dimethyl carbonate

A technology of dimethyl carbonate and methyl nitrite, which is applied in the field of synthesizing dimethyl carbonate by methanol oxidative carbonylation, can solve the problems of prolonging the service life of the catalyst and insufficient stability of the catalyst activity, and achieve long life and reduced hazards Effect

Inactive Publication Date: 2006-01-25
CHINA PETROCHEMICAL CORP +1
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Problems solved by technology

[0007] The present invention aims at the shortcoming of directly using highly toxic methyl chloroformate and insufficient stability of catalyst activity in the prior art, and proposes a method of adding an auxiliary r

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  • Method of producing dimethyl carbonate

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Embodiment 1

[0023] 100ml PdCl in the main reaction area 2 ~CuCl 2 ~AlCl 3 / AC catalyst, the inner diameter of the reaction zone is 30mm, and the length is 600mm. The upper and lower parts of the catalyst bed are respectively equipped with the same amount of inert fillers with the same particle size as the catalyst to ensure the preheating and uniform distribution of the reaction raw material gas.

[0024] 1ml PdCl in the auxiliary reaction zone 2 / γ~Al 2 o 3Catalyst, the inner diameter of the reaction zone is 5 mm, and the length is 100 mm. The upper and lower layers of the catalyst bed are equipped with the same amount of inert fillers with the same particle size as the catalyst to ensure the preheating and uniform distribution of the reaction raw material gas.

[0025] The composition (V) of the raw material entering the auxiliary reaction zone is CO10%, CH 3 ONO2%, HCl1%, the rest is inert gas and a small amount of NO, CH 3 OH et al. The total flow is 5l.h -1 , that is, the air...

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Abstract

The invention discloses a process for producing dimethyl carbonate which comprises, mixing HCl with the gaseous mixture of carbon monoxide and methyl nitrite, then entering auxiliary reaction area, mixing the product yield of the subsidiary reaction zone with the gaseous mixture of carbon monoxide raw material gas and methyl nitrite, entering main reaction zone, condensing and absorbing the product yield of the main reaction zone, separating and rectifcating the condensate liquid, thus obtaining the dimethyl carbonate product, while the non-condensed gas, oxygen, nitrogen monoxide reacting with methanol and obtaining and methyl nitrite for use by the subsidiary reaction zone and the main reaction zone. The process provided by the invention can sustain catalytic activity, extend period of catalyst use, and avoid the use of hypertoxic methyl chloroformate.

Description

technical field [0001] The invention belongs to the field of petrochemical industry and relates to a method for producing dimethyl carbonate, in particular to a method for synthesizing dimethyl carbonate by methanol oxidative carbonylation. Background technique [0002] Dimethyl carbonate has a wide range of industrial uses. It can replace highly toxic substances such as phosgene, methyl chloroformate, dimethyl sulfate and methyl chloride as carbonylating agent, methylating agent and methylating agent, and can directly synthesize polycarbonate, Isocyanates, etc. Due to the high oxygen content of dimethyl carbonate, it is suitable as a fuel additive, which greatly improves the anti-knock value of gasoline; adding it to fuel can also reduce particulate matter emissions and avoid the production of chemical smog, so the industrial application prospect of dimethyl carbonate is very good . [0003] In the prior art, CO low-pressure catalytic synthesis of dimethyl carbonate is c...

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Application Information

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IPC IPC(8): C07C69/96C07C68/00
Inventor 孟凡东李朝恒王秀珍裴旭东陈卫红程国梁张凡
Owner CHINA PETROCHEMICAL CORP
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