Urea alcoholizing process of synthesizing dimethyl carbonate

Abstract

The urea alcoholizing process for synthesizing dimethyl carbonate includes adding solid alkali into reactor, adding urea solution comprising urea and methanol in the molar ratio of 0.01-100 and the material feeding rate radio of 0.01-100 into the reactor, and reaction at 150-250 deg.c and 0.1-10 MPa in the conditions of reactor bottom temperature 70-200 deg.c, stripping section temperature 70-200deg.c, rectifying section temperature 70-200 deg.c and reflux ratio of 1-20. The present invention has the advantages of continuous process, mild reaction condition, etc.

Description

[0001] Field: [0002] The invention belongs to a method for synthesizing dimethyl carbonate, in particular to a method for synthesizing dimethyl carbonate by urea alcoholysis Background technique: [0003] Dimethyl carbonate (DMC) is a new type of "green" chemical product that has attracted much attention at home and abroad in recent years. Because its molecule contains methoxyl, carbonyl and carbonylmethyl groups, it has good reactivity and can replace highly toxic phosgene as a carbonylating agent and dimethyl sulfate as a methylating agent. It can be used as a raw material The direct synthesis of food additives, antioxidants, plant protection agents, advanced resins, fuel and drug intermediates, surfactants, etc., is known as a potential "new building block" in organic synthesis. At the same time, DMC can be used as an ideal gasoline additive because of its high oxygen content and appropriate vapor pressure, water resistance and mixing partition coefficient, which further...

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Problems solved by technology

However, because the reaction is limited by thermodynamic equilibrium conditions, the equilibrium conversion rate is low

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