Process for producing dimethyl carbonate from industrial synthetic gas

Abstract

The invention relates to a process for producing dimethyl carbonate from industrial synthetic gas. According to the invention, O2, CO, N2, NO, and methanol are delivered into an esterification system for esterification; heavy component drawn from the esterification system is subjected to recovery treatment in a wastewater tower; light component drawn from the esterification system passes a compressor II and is subjected to a carbonylation reaction in a carbonylation reactor; the carbonylation reaction product is delivered into a second condensation separation tower, and is subjected to gas-liquid separation; separated liquid phase is refined in a pressurized rectification tower; part of non condensable gas is discharged from the separated gas phase, and the gas phase is continued to be subjected to a reaction in the esterification system; the discharged non-condensable gas is delivered into a denitration reactor; light component at a top of the pressurized rectification tower is subjected to further recovery treatment in a methanol recovery tower; heavy component from the pressurized rectification tower is delivered into a product tower; dimethyl carbonate is drawn from the top of the product tower, and dimethyl oxalate is drawn from the bottom of the product tower. The process has the economical and practical characteristics of low equipment investment, environment friendliness, energy saving, high catalyst efficiency, high raw material utilization rate, and the like.

Description

technical field [0001] The invention relates to a process for producing dimethyl carbonate from industrial synthesis gas, in particular to a process for energy-saving and environment-friendly large-scale industrial synthesis of dimethyl carbonate. Background technique [0002] Dimethyl carbonate (English name Dimethyl carbonate), is a colorless transparent liquid at room temperature, can be mixed with organic solvents such as alcohols, ketones, and esters in any proportion, slightly soluble in water, with a melting point of 4°C, a boiling point of 90.3°C, and a flash point of 18°C , density 1.069. DMC is a green organic compound with less toxic esters and is biodegradable. It can replace highly toxic phosgene and dimethyl sulfate as carbonylating and methylating agents, and is used in the production of pesticides, pharmaceuticals, polycarbonates and polyurethanes. At the same time, it is widely used in organic synthesis, reagents, solvents, oxygenates, dyes, electronic che...

AI Technical Summary

Problems solved by technology

The patents mentioned in the industry do not adopt any energy-saving measures in the esterification rectification tower, and the large amount of heat energy released by the reaction cannot be effectively recovered, resulting in energy loss. Less, but more efficient and the separation and purification process of the required dimethyl carbonate as simple as possible is the only way to improve the economics and efficiency of the plant

[0011] In summary, in the existing process technology of methanol carbonylation to synthesize dimethyl carbonate, none of the documents has explained the method or approach suitable for the continuous preparation of DMC in industry for energy saving and environmental protection

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