Process and device system for production of dimethyl oxalate by high-pressure carbonylation of industrial synthesis gas and hydrogenation to ethylene glycol

Abstract

The utility model relates to a device system for producing dimethyl oxalate by high-pressure carbonylation of industrial synthetic gas and preparing ethylene glycol by hydrogenation. The device system comprises an esterification reaction system, a carbonylation reaction system, a relief gas and waste acid coupled recovery system and a hydrogenation reaction system, wherein the esterification reaction system is used for generating methyl nitrite by reaction; methyl nitrite is treated by the carbonylation reaction system to generate a carbonylation product mainly containing dimethyl oxalate and dimethyl carbonate; the carbonylation product is separated to obtain a dimethyl carbonate, and the rest dimethyl oxalate is treated by the hydrogenation reaction system to generate an ethylene glycol product; waste acid in the esterification reaction and relief gas in the carbonylation reaction are recycled by the relief gas and waste acid coupled recovery system. The device system has the characteristic that the energy consumption is remarkably reduced; the effect is remarkable in combination with the application of the useful substance recycling step, particularly high coupling of waste nitric acid and relief gas recycling as well as recycling of hydrogen in waste gas during separation and reaction.

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 it to produce ethylene glycol. Background technique [0002] Ethylene glycol is a versatile chemical that is mainly used in various production fields such as polyester fibers (PET), antifreeze, ethanolamine, and explosives, and is widely used as a solvent, lubricant, and plasticizer, while ethylene glycol is widely used. The application of diols in the PET polyester industry is close to 95%. The current industrial ethylene glycol production mainly adopts the route of obtaining ethylene oxide through gas phase oxidation of petroleum ethylene, and then through liquid phase catalytic hydration to prepare ethylene glycol. However, with the long-term high price of international oil prices i...

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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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