Process for preparing dimethyl carbonate catalyst by liquid-phase oxidation carbonylation of methanol

Abstract

The invention relates to a process for preparing a dimethyl carbonate catalyst by liquid-phase oxidation carbonylation of methanol. The process comprises the following steps: respectively dispersing or dissolving cuprous halide and one or more of nitrogenous heterocyclic compounds and nitrogen-containing polymers in an organic solvent; adding a solution / suspension into another solution / suspension at a certain temperature and stirring speed, continuously stirring for a certain period to form a coordination complex; transferring the suspension into a vacuum drier, removing the organic solvent at a certain temperature and vacuum degree to obtain a solid powdered catalyst, and grinding the catalyst to 100-200 meshes; and adding a dry powder catalyst, methanol, CO and O2 into a batch reactor, and synthesizing dimethyl carbonate at a temperature of 90-130 DEG C and pressure of 2.0-3.0MPa, wherein the per-pass conversion is more than or equal to 30 percent, and the selectivity of the target product dimethyl carbonate is more than or equal to 99.9 percent. The catalyst is simple in preparation process, cannot be easily caked, and has good activity, selectivity and stability.

Description

technical field [0001] The invention relates to a preparation process of a catalyst for synthesizing dimethyl carbonate by methanol liquid-phase oxidative carbonylation, and belongs to the technical field of chemical industry. Background technique [0002] Since dimethyl carbonate (DMC) was listed as a non-toxic chemical by Europe in 1992, as a "green" chemical product, its synthesis method and application field have been continuously expanded. Dimethyl carbonate contains functional groups such as carbonyl, methyl, methoxy, carboxyl and methoxycarbonyl, and has good reactivity. It is widely used in pesticides, medicines, plastics, dyes, electronic chemicals, food additives and other fields. Dimethyl carbonate can replace phosgene as a carbonylating agent; replace dimethyl sulfate as a methylating agent; it can also be used as a low-toxic solvent for paint solvents and solvents used in the pharmaceutical industry; and it is replacing methyl tert-butyl ether It has very broad...

AI Technical Summary

Problems solved by technology

This patent proposes a new preparation process for the shortcomings of such catalysts, such as easy agglomeration, uneven dispersion, inconvenient transportation and industrial operation when the raw materials are dissolved in organic solvents.