Dimethyl carbonate production process

Abstract

The invention relates to a dimethyl carbonate production process, which comprises: (1) placing methanol and a porous catalyst in a reaction container, sealing the container, purging to discharge the air in the container, introducing carbon dioxide, and heating; concretely, the porous catalyst is prepared by: (a) dissolving copper hydroxide powder and nickel hydroxide powder in ammonia water, and uniformly stirring to form a bimetallic complex solution; (b) immersing porous montmorillonite into the bimetallic complex solution, sintering the mixture in a protective atmosphere, and drying by distillation to obtain a catalyst precursor; and (c) heating the catalyst precursor in a reducing atmosphere to obtain the catalyst; and (2) after the reaction is finished, cooling the reaction container to room temperature, discharging the gas in the container, discharging the reactant, and separating the dimethyl carbonate from the reactant, thereby obtaining the product. According to the method disclosed by the invention, copper and nickel are loaded on montmorillonite with a porous structure, so that the content of the catalyst on the carrier with the same mass is effectively increased, and the catalytic efficiency is promoted.

Description

technical field [0001] The invention relates to the field of dimethyl carbonate preparation, in particular to a production process of dimethyl carbonate. Background technique [0002] Dimethyl carbonate (C 3 h 6 o 3 ) is an important intermediate in organic synthesis. Due to the functional groups such as methyl, methoxy, and carbonyl in its molecular structure, dimethyl carbonate has a variety of reactivity, such as for methylating agents and carbonylation agent etc. At present, dimethyl carbonate has been widely used as a solvent in the paint, coating, and adhesive industries. The synthetic method of dimethyl carbonate mainly comprises: phosgene method, take cupric chloride or nitric oxide as oxidative carbonylation reaction of catalyst, transesterification reaction of propylene carbonate and methyl alcohol, urea methanolysis reaction, but these methods all exist Various deficiencies, for example, the toxicity and corrosiveness of phosgene have led to the disuse of thi...

AI Technical Summary

Problems solved by technology

The synthetic method of dimethyl carbonate mainly comprises: phosgene method, take cupric chloride or nitric oxide as oxidative carbonylation reaction of catalyst, transesterification reaction of propylene carbonate and methyl alcohol, urea methanolysis reaction, but these methods all exist Various deficiencies, for example, the toxicity and corrosiveness of phosgene lead to the long-discontinued use of this method

with CuCl 2 The single-pass conversion rate of the method for the catalyst to catalyze the oxidative carbonylation of methanol to prepare dimethyl carbonate is low, and the catalyst is seriously deactivated

And the production cost of the method that urea methanolysis prepares dimethyl carbonate is higher

At present, the synthesis of dimethyl carbonate from carbon dioxide and methanol has become a research hotspot, which can effectively utilize the greenhouse gas carbon dioxide, but this method is difficult to carry out under conventional conditions and requires a catalyst to catalyze