Process for preparing high purity carbon monoxide gas by desulfurization of organic sulfur at low and normal temperature

Abstract

The invention relates to a technology for removing organic sulfur at a low or normal temperature to prepare high-purity carbonic oxide gas. The method consists of gasifying the coke with carbon monoxide or carbon dioxide to prepare the raw gases including 10 % -99 % CO, 0.1 %-90 % CO2, 0.001 %-2 % O2, 50-9000ppm COS, 10-10000ppm H2S, through gas storage holder, after pressurization and pyrogenation, entering purification tower filled with puripreservatives of A and B to remove hazardous materials including nitrogen oxide, hydrogen arsenide, hydrogen phosphide, hydrogen chloride, hydrogen nitrile, oxides of sulfur and sulfureted hydrogen, entering tower for removing organic sulfur filled with sulfur carbonyl hydrolyst, hydrolyzing 85%-95% of sulfur carbonyl for conversion into sulfureted hydrogen, at 20-150 DEG C, with a pressure of 0.1-10 MP, in which the refined raw gases can be used by productions of fine chemical industry including downstream acetate, dimethyl formamide,dimethyl ether, toluene diisocyanate or methyl diphenylene diisocyanate. The technology converts 85 %-95 % of sulfur carbonyl into sulfureted hydrogen, can adopt routine wet desulfurization to replace polyethylene glycol dimethyl ether desulfuration,can carry out cycle utilization of carbon dioxide and sulfur carbonyl of decarburized desorption gases of polyethylene glycol dimethyl ether, and can carry out zero discharge of poison material of sulfur carbonyl, which is good for environmental conservation.

Description

technical field [0001] The invention relates to a process for removing organic sulfur at low and normal temperature from crude carbon monoxide gas obtained by gasifying coke with oxygen and carbon dioxide. In particular, it relates to a process for mainly removing COS at low and normal temperature from crude carbon monoxide gas obtained by gasifying coke with oxygen and carbon dioxide. Background technique [0002] High-purity carbon monoxide gas is an important raw material for various fine chemical products such as oxo synthesis. Since the carbonylation reaction basically needs to be completed with the participation of the catalyst, the catalyst has strict requirements on the gas quality, and even a small amount of sulfide will cause the catalyst to be quickly poisoned and deactivated. It is generally required to remove the total sulfur in the gas to less than 0.2ppm, so as to prolong the life of the catalyst as much as possible and improve the economic benefits of the pr...

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Problems solved by technology

[0005] Due to the multi-stage polyol ether washing and absorption process used in the design to remove organic sulfur compounds in the gas, mainly COS, although it has been put into operation for many years to meet the quality requirements of carbonylation gas, the investment and operating costs are relatively high, and the desorption The high content of COS in the air is discharged into the atmosphere, causing air quality pollution, which is not conducive to environmental protection, and needs to be further improved

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