Method of producing dimethyl carbonate

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...

AI Technical Summary

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 reaction zone in front of the main reaction zone to produce dimethyl carbonate. Maintain the activity of the catalyst, prolong the service life of the catalyst, and do not directly use highly toxic methyl chloroformate

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