Technology and device system for producing dimethyl oxalate by high-pressure carbonylation of industrial synthesis gases and producing ethylene glycol through dimethyl oxalate hydrogenation

Abstract

The invention relates to a technology and a device system for producing dimethyl oxalate by high-pressure carbonylation of industrial synthesis gases and producing ethylene glycol through dimethyl oxalate hydrogenation. The technology comprises the following steps: adopting industrial NO, O2 and methanol as raw materials for an esterification reaction to produce methyl nitrite; adopting industrial CO and methyl nitrite for a carbonylation reaction in a plate reactor to produce carbonylation products, which mainly include dimethyl oxalate and dimethyl carbonate; separating the carbonylation products to obtain dimethyl carbonate products; subsequently adding hydrogen into dimethyl oxalate in the plate reactor to produce ethylene glycol products; conducting the coupling recovery treatment on waste acids in the esterification reaction and purge gases in the carbonylation reaction for recycling. The device system comprises an esterification reaction system, a carbonylation reaction system, a coupling recovery system for purge gases and waste acids and a hydrogenation reaction system. The technology has the characteristic that device consumption is remarkably reduced, and particularly the nitric acid waste liquid recycling and purge gas recycling technologies as well as the separation technologies thereof are highly coupled; recycling of the raw materials in reaction waste gases is realized, and the effect is remarkable.

Description

technical field [0001] The invention relates to a process and a device system for producing ethylene glycol from industrial synthesis gas, in particular to a process and a device system for producing dimethyl oxalate by high-pressure carbonylation of industrial synthesis gas and hydrogenating ethylene glycol. Background technique [0002] Ethylene glycol is a widely used chemical, which is mainly used in various production fields such as polyester fiber (PET), antifreeze, ethanolamine, and explosives, and is widely used as a solvent, lubricant, and plasticizer. The application of diol in PET polyester industry is close to 95%. At present, the production of ethylene glycol in the industry mainly adopts the route of producing ethylene oxide through gas-phase oxidation of petroleum ethylene, and then ethylene glycol through liquid-phase catalytic hydration. However, as the international oil price has remained high for a long time in recent years, the global industrial chain of...

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problems of low raw material utilization rate, high production cost, low catalyst utilization rate, low filling factor, excessive equipment investment, single-series equipment unable to adapt to large-scale equipment, high system consumption and problems existing in the current production of ethylene glycol technology. The use of the device cannot meet the country's increasing requirements for the industrial environment, etc., and provide a process and its device system for improving the production capacity of a single series of devices, tail gas treatment, by-product recovery and comprehensive utilization of raw materials

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