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...

Examples

Embodiment 1

[0141] In this example, refer to the attached figure 1 The apparatus and procedures shown set up the various reaction components.

[0142] Industrial-grade CO (98V%), which is the reaction raw material of carbonylation reactor 1, and nitrogen, which is an inert gas source, are used together as a pre-esterification tower 17 (inner diameter 160mm, height 1500mm, theoretical plate number 20, and the plate structure is sieve plate type plate reaction distillation tower) reaction hot dilution gas and cycle gas (composition: CO: 10.7v%, CO 2 :2.4v%, MN: 9.6v%, N 2 : 63.9v%, Methanol: 2.6v%, DMC: 0.8v%, NO: 10v%) and NO from outside the boundary area are mixed and then enter the pre-esterification tower 17 (the 16th tray is fed and fed), and the separated Oxygen entering the pre-esterification tower 17 from the three routes (feeding at the 2nd, 6th and 10th trays) and the methanol raw material fed into the first tray at the top of the tower are countercurrently contacted on the tra...

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...

Examples

Embodiment 1

[0141] In this example, refer to the attached figure 1 The apparatus and procedures shown set up the various reaction components.

[0142] Industrial-grade CO (98V%), which is the reaction raw material of carbonylation reactor 1, and nitrogen, which is an inert gas source, are used together as a pre-esterification tower 17 (inner diameter 160mm, height 1500mm, theoretical plate number 20, and the plate structure is sieve plate type plate reaction distillation tower) reaction hot dilution gas and cycle gas (composition: CO: 10.7v%, CO 2 :2.4v%, MN: 9.6v%, N 2 : 63.9v%, Methanol: 2.6v%, DMC: 0.8v%, NO: 10v%) and NO from outside the boundary area are mixed and then enter the pre-esterification tower 17 (the 16th tray is fed and fed), and the separated Oxygen entering the pre-esterification tower 17 from the three routes (feeding at the 2nd, 6th and 10th trays) and the methanol raw material fed into the first tray at the top of the tower are countercurrently contacted on the tra...

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