Technology of producing dimethyl carbonate by alcoholysis of urea

Abstract

The present invention relates to a process for producing dimethyl carbonate by using urea alcoholysis method. Said process includes the following several steps: making urea solution and methyl alcohol be backwards fed into reaction zone of reaction rectification tower according to the mole ratio of 8-12:1 to make contact reaction, under the action of catalyst producing crude dimethyl carbonate solution, then making said crude dimethyl carbonate solution undergo the processes of normal pressure distillation, pressure distillation, secondary normal pressure distillation and fine purification so as to obtain the invented product dimethyl carbonate.

Description

technical field [0001] The invention relates to a synthesis process of dimethyl carbonate, in particular to a production process for synthesizing dimethyl carbonate from urea and methanol. Background technique [0002] At present, there are three main industrial production methods of dimethyl carbonate: phosgene method, transesterification method and methanol oxidative carbonylation method. [0003] Phosgene method: first, phosgene reacts with methanol to generate methyl chloroformate, and then further reacts with methanol to obtain dimethyl carbonate. This method is gradually being eliminated due to its high toxicity, complicated process, serious corrosion and high chlorine content in the product, which is likely to cause human injury and environmental pollution. [0004] Transesterification method: ethylene oxide or propylene oxide, methanol and carbon dioxide are used as raw materials. Due to the high price of raw materials used in this method, the economic benefits are ...

AI Technical Summary

Problems solved by technology

At the same time, it overcomes the shortcomings of low conversion rate due to the mixing of materials and reaction products in the process of producing dimethyl carbonate by the existing urea alcoholysis method