Production method of methyl glycolate

Abstract

The invention relates to a production method of methyl glycolate, aiming to mainly solve the problems of low conversion rate of dimethyl oxalate and low selectivity of methyl glycolate in the prior art. The production method of methyl glycolate comprises the following steps of (1) enabling a mixed material composed of a methanol solution of dimethyl oxalate and feed gas containing hydrogen to be in contact with a silver-containing catalyst in a reactor to react to obtain a mixture flow containing methyl glycolate, carrying out heat exchange, and then, enabling the mixture flow to enter a gas-liquid separation system; (2) sequentially carrying out condensation, primary gas-liquid separation, condensation and secondary low-temperature gas-liquid separation on the mixture flow subjected to heat exchange to obtain crude methyl glycolate; and (3) carrying out reduced-pressure distillation separation on crude methyl glycolate to obtain the methyl glycolate product. According to the technical scheme, the conversion rate of dimethyl oxalate can be higher than 99%, the selectivity of methyl glycolate can be higher than 80%, and the production method can be applied to industrial production of methyl glycolate.

Description

technical field [0001] The invention relates to a method for producing methyl glycolate. Background technique [0002] Methyl glycolate (HOCH 2 COOCH 3 , MG) is an important chemical product and intermediate, because it has both hydroxyl and ester functional groups, which makes it have both the chemical properties of alcohol and ester, and is widely used in many industries such as chemical industry, medicine, pesticide, feed, dyes and spices. field. Mainly include: 1) Used as an excellent solvent in fibers, resins, rubber, and semiconductors; 2) Further hydrogenation and reduction to ethylene glycol; 3) Carbonylation to produce (mono) methyl malonate; 4) Ammonolysis to produce glycine ; 5) Oxidative dehydrogenation of methyl glyoxylate; 6) Hydrolysis of glycolic acid and the like. Among the many uses of methyl glycolate, the hydrolysis of glycolic acid (GA) has great development value and broad market prospects. [0003] At present, there is no mature environment-friend...

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Problems solved by technology

[0013] In order to solve the problems of low conversion rate of dimethyl oxalate and low selectivity of methyl glycolate in the prior art, the invention provides a method for producing methyl glycolate, which focuses on the production process of methyl glycolate Technology, using silver-based catalyst, by optimizing raw materials (mass concentration of dimethyl oxalate) and optimizing process conditions (including hydrogen ester molar ratio, reaction pressure, reaction temperature), while ensuring the conversion rate of dimethyl oxalate>99% , also improves the selectivity of methyl glycolate (>80%), the concentration of methyl glycolate distilled from the top of the methyl glycolate tower is greater than 99%, and the content of dimethyl oxalate is lower than 0.5%, no need to design The rectification tower separates methyl glycolate and dimethyl oxalate, which can avoid the problem of difficult separation of methyl glycolate and dimethyl oxalate, and reduce energy consumption and equipment requirements

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