Large-scale energy-saving production device and process for preparing ethylene glycol through dimethyl oxalate hydrogenation

Abstract

The invention discloses a large-scale energy-saving production device and process for preparing ethylene glycol through dimethyl oxalate hydrogenation, and relates to the field of chemical processes. The device comprises a whole reactor group consisting of a gasification device, a first synthesis reactor and a second synthesis reactor, a heater, a feeding and discharging heat exchanger, a first high-pressure separation tank and a second high-pressure separation tank; the process comprises the following steps: circulating gas of hydrogen enters the gasification device, pumped dimethyl oxalate is gasified, gasified reaction gas enters the first synthesis reactor to react with the second synthesis reactor group, the gas is subjected to heat exchange, the reaction gas subjected to heat exchange enters the first high-pressure separation tank to be subjected to gas-liquid separation, and crude ethylene glycol is obtained at the bottom of the tank; the separated gas is cooled and then subjected to gas-liquid separation, and crude methanol is obtained at the bottom of the tank. The circulating compressor is lower in power consumption; the pressure drop of the reactor is reduced, the service life of the catalyst is prolonged, the ethylene glycol rectification yield is improved, steam energy consumption is reduced, and enterprise benefits are improved. Large-scale production can be realized more easily.

Description

technical field [0001] The invention belongs to the field of chemical technology, in particular to a large-scale energy-saving production device for dimethyl oxalate hydrogenation to ethylene glycol and a large-scale energy-saving production process for dimethyl oxalate hydrogenation to ethylene glycol. Background technique [0002] The hydrogenation of dimethyl oxalate to ethylene glycol is a strong exothermic reaction, the reaction residence time is only a few seconds, and the reaction is mainly concentrated on the catalyst in the middle and upper part of the tube, and the catalyst in the middle and lower part of the tube is less involved in the reaction. The function is to further react the remaining trace amount of dimethyl oxalate and methyl glycolate completely. At present, in China, the reactors of various design units and production enterprises all use a single tube reactor, and no more in-depth research has been done on the reaction characteristics of dimethyl oxala...

AI Technical Summary

Problems solved by technology

Not only the process is long, the floor area is large, the project cost is high, the power consumption and steam consumption are high

In the long run, only when the oil price is high, the synthesis gas to ethylene glycol can achieve breakeven, which greatly reduces the company's ability to resist risks. Especially recently, many syngas to ethylene glycol companies have been in a state of shutdown. The overall operating rate of the industry is less than 50%

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