PROCESS AND DEVICE SYSTEM FOR PRODUCING DIMETHYL OXALATE BY HIGH-PRESSURE CARBONYLATION OF INDUSTRIAL SYNTHESIS GAS AND PRODUCING ETHYLENE GLYCOL BY HYDROGENATION

摘要

The present invention relates to a process and a device system for producing dimethyl oxalate by high-pressure carbonylation of industrial synthesis gas and producing ethylene glycol by hydrogenation. The process comprises the steps of: using industrial NO, O₂ and methanol as raw materials for an esterification reaction to produce methyl nitrite; and then using 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; subjecting dimethyl oxalate to subsequent hydrogenation in the plate reactor to produce ethylene glycol products; subjecting the waste acids in the esterification reaction and purge gases in the carbonylation reaction to a coupling recovery treatment for recycling. The 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 process has the characteristic that device consumption is remarkably reduced, and particularly the nitric acid waste liquid recycling and purge gas recycling are highly coupled as well as the separation process thereof; recycling of the raw materials in reaction waste gases is realized, and the effect is remarkable.