Deep combined purification process for synthetic gas

Abstract

The invention provides a deep combined purification process for synthetic gas; the synthetic gas sequentially passes through a catalysis hydrogenation tower, an arsenic removing tower, a dechlorination tower, a fine desulphurization tower, a protection tower, an alkene saturation tower and a deoxidation tower to obtain the deep purified synthetic gas. After deep purification, the synthetic gas achieves that: sulphur (H2S and organic sulfur) is removed to less than 10 ppb; arsenic (AsH3 and organic arsenic) is removed to less than 10 ppb; chlorine (HCl and organic chlorine) is removed to less than 10 ppb; a carbonyl metal compound is removed to less than 20 ppb; oil stain is removed to less than 1 ppm; alkene is removed to less than 0.1 ppm; and oxygen is removed to less than 1 ppm. The deep purification proposal can greatly prolong the service life of a methane synthesis catalyst and has remarkable economic benefit. The deep combined purification process is also suitable for oil made from coal, methanol made from coal and the like; and the economic benefit is even higher than that of methanol synthesis equipment.

Description

technical field [0001] The invention relates to the field of purification of synthesis gas, in particular to the problem of deep purification of synthesis gas prepared from coal. Background technique [0002] The research on the purification of synthesis gas generally focuses on the purification of synthetic raw materials or raw gas and the purification process. For methane or methanol production plants that use coal as raw material to produce synthesis gas, most of the synthesis gas uses a low-temperature methanol washing process to remove acid gases. Because the catalysts used in methane synthesis, methanol synthesis, ammonia synthesis, and other organic synthesis have high activity and selectivity, they are very sensitive to toxic substances such as sulfur, chlorine, and arsenic. In order to ensure the activity and life of the catalyst, it is necessary to Strictly control the purity of synthesis gas, and carry out advanced purification treatment for trace impurities in r...

AI Technical Summary

Problems solved by technology

However, this method does not deal with the organic chlorine and organic arsenic in the syngas, ignoring the possible impact of olefins and possible oil pollution on the catalyst

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