Process for synthesizing diethyl carbonate by oxidization and oxonation of alcohol

Abstract

A process for synthesizing diethyl carbonate from alcohol, oxygen and CO through direct oxidization and oxonation in liquid phase under the existance of catalyst features that a homogeneous two-component catalyst system is used, where the high-activity copper salt and cuprous salt are used as primary catalyst and the organic nitride is used as cocatalyst; and a single-tube bubbling-type reactor is used. Its advantages are simple process, high output rate, low cost and no pollution.

Description

technical field [0001] The invention relates to a process for synthesizing diethyl carbonate by direct oxidative carbonylation of ethanol, oxygen and carbon monoxide in a liquid phase in the presence of a catalyst. Background technique [0002] Diethyl carbonate (DEC) is an important green organic chemical product, which has many uses in organic synthesis, medicine, pesticide, solvent, fuel additive and so on. The technical methods for synthesizing diethyl carbonate mainly include phosgene method, transesterification method and oxidative carbonylation method, among which phosgene method is a traditional industrial method, using highly toxic phosgene raw materials, and the production process is seriously polluted and highly corrosive ,high cost. The transesterification method uses various carbonates and ethanol to carry out the exchange reaction, and the process is relatively complicated and the cost is high. The oxidative carbonylation method is a method of directly oxidat...

AI Technical Summary

Problems solved by technology

The process methods for synthesizing diethyl carbonate mainly include phosgene method, transesterification method and oxidative carbonylation method, among which phosgene method is a traditional industrial method, using highly toxic phosgene raw materials, and the production process is seriously polluted and highly corrosive ,high cost

The transesterification method uses various carbonates and ethanol for exchange reactions, and the process is relatively complicated and the cost is high

The oxidative carbonylation method is a method of directly oxidative carbonylation of ethanol, oxygen, and carbon monoxide under the action of a catalyst to synthesize diethyl carbonate. Among them, the oxidative carbonylation method and the gas phase oxidative carbonylation method using NO / NOx as redox agents have The disadvantages of serious pollution and low yield

Using ethanol, oxygen, and carbon monoxide in the presence of a catalyst to directly oxidize and carbonize the oxidative carbonylation of diethyl carbonate in the gas phase, the article published by B.C.Dunn, Department of Chemistry, University of Utah, etc. Diethyl carbonate" (Energy and Fuels Vol: 16(1), 177-181 2002) introduces the method of synthesizing diethyl carbonate, but the catalytic system they use is heterogeneous, and the catalyst used is mainly PdCl 2 , expensive, difficult to prepare and regenerate

The process is complicated, the conversion rate of ethanol is low, and the selectivity is poor, so there are more by-products produced