Method for producing dialkyl carbonate

Abstract

Disclosed is a method for producing dialkyl carbonate comprising: using organic halide metal catalyst fit with at least one catalyst promoter containing nitrogen atoms to form a catalyst system in the presence of alcohol compound, carbon monoxide and oxygen gas, and carrying out a liquid-phase oxidative carbonylation reaction to obtain dialkyl carbonate. The method for producing dialkyl carbonate uses organic halide metal catalyst fit with the catalyst promoter containing nitrogen atoms, thereby improving the conversion rate, selectivity of catalysis, and reaction yield, and reducing catalyst consumption and reduce the corrosion on reactor.

Description

technical field [0001] The invention relates to a method for producing dialkyl carbonate by utilizing an alcohol compound, in particular to a method for producing dialkyl carbonate by utilizing an alcohol compound for oxidative carbonylation. Background technique [0002] Dimethyl carbonate is a very versatile product as an organic solvent or as a reactant instead of phosgene in the synthesis of other alkyl and aryl carbonates. These alkyl carbonates and aryl carbonates can be used as synthetic lubricants, solvents, plasticizers and organic glass monomers, and are used in methylation and carbonylation reactions, such as isocyanate, polyurethane and polycarbonate preparation. Other applications of dimethyl carbonate, as disclosed in U.S. Patent No. 2,331,386, use dimethyl carbonate or other organic carbonates, or mixtures of organic carbonates and ethers, especially methyl tert-butyl ether, as gasoline or additives for fuels heavier than gasoline to improve their antiknock ...

AI Technical Summary

Problems solved by technology

[0005] Chinese Patent No. CN1197792A (1998) uses cuprous chloride as the main catalyst, and magnesium chloride, calcium chloride, zinc chloride, potassium chloride, etc. are cocatalysts to prepare a composite catalyst of alkaline earth metals. Although this catalyst system improves the chlorination The dissolubility of cuprous in the reaction solution, but still do not solve the corrosion problem of equipment; The Japanese Patent No. 54-24827 is the same with cuprous chloride as the main catalyst, and adds alkali metal or alkaline earth metal halide as auxiliary Catalyst to Synthesis of Dimethyl Carbonate

In Chinese Patent Publication No. 1333086A, as claimed in its claims, nitrogen-containing compounds, such as pyridine, imidazolinopyridine, polypyridine, 4-phenylpyridine, N-methylpyrrolidone; or nitrogen-containing polymers, Such as polyvinylpyridine and polyvinylpyrrolidone, the production capacity of the copper chloride complex catalyst as a ligand to synthesize dimethyl carbonate is not high, and the problem of using a large amount of catalyst still needs to be solved

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