Catalyst for synthesizing methyl glycolate through hydrogenation by dimethyl oxalate and preparation method thereof

Abstract

The invention discloses a catalyst for synthesizing methyl glycolate through hydrogenation by dimethyl oxalate and a preparation method thereof. The catalyst takes metal copper as a main active component, silver and manganese as auxiliary components and Al2O3 as a carrier, wherein the content of metal copper accounts for 25-50% of the mass of the catalyst, the content of metal silver accounts for 5-15% of the mass of the catalyst, the content of metal manganese accounts for 8-20%, and the content of Al2O3 accounts for 15-40% of the mass of the catalyst. In the reaction for synthesizing methyl glycolate through hydrogenation by dimethyl oxalate, the catalyst of the invention has the advantages of high reaction activity, simple preparation method, easily obtained raw material resource, low price, lower cost and longer service life, the methyl glycolate has high selectivity, stable reaction performance and easy controllability.

Description

technical field [0001] The invention belongs to the field of catalyst chemistry, in particular to a catalyst for hydrogenating dimethyl oxalate to synthesize methyl glycolate and a preparation method thereof. Background technique [0002] Methyl glycolate is a compound with α-H, hydroxyl and ester functional groups. Therefore, it can undergo carbonylation reactions, hydrolysis reactions, and oxidation reactions. It is widely used in organic synthesis and drug synthesis, as an important chemical reaction intermediate Body: a. Hydrogenation reduction to produce ethylene glycol, a bulk chemical product, to solve the shortage of raw materials for the production of ethylene glycol from petroleum routes; b. Hydrolysis to produce glycolic acid, which is widely used as a fungicide and chemical cleaning agent; c. Oxidative deoxidation Hydrogenation of methyl glyoxylate, the hydrolysis product of glyoxylate, glyoxylic acid is the main raw material for the synthesis of vanillin spices,...

AI Technical Summary

Problems solved by technology

[0003] At present, the production of methyl glycolate at home and abroad mainly adopts the chloroacetic acid method, that is, mixing chloroacetic acid with caustic soda, then removing the sodium chloride generated by the reaction to obtain glycolic acid, and then adding methanol and concentrated sulfuric acid to react to generate methyl glycolate. The production pollution is serious, the wastewater is difficult to treat, and the produced methyl glycolate has a low concentration and high chloride ion content, which seriously affects the use as an intermediate in the fields of medicine and other fields.

Japan's Mitsui Topress Chemical Co., Ltd. uses glyoxal and methanol as raw materials, and uses Al(NO 3 ) 3 9H 2 O is the catalyst and reacts at 160°C to form methyl glycolate. Since glyoxal is expensive, this process is not economical

Another method is to condense formaldehyde aqueous solution and CO in the presence of catalysts such as sulfuric acid or boron trifluoride at about 70 MPa and high temperature to generate glycolic acid, and then react with methanol to generate methyl glycolate. High pressure, the actual production is very difficult