Carbon monoxide feed gas dehydrogenation separation purification process

Abstract

The invention relates to a carbon monoxide feed gas dehydrogenation separation purification process which comprises the following two steps: hydrogen absorption: under the action of a hydrogen absorption catalyst, absorbing hydrogen from carbon monoxide raw material gas by adopting organic liquid to obtain hydrogen absorption liquid and carbon monoxide treatment gas, wherein the organic liquid isselected from at least one of cyclohexane, tetrahydronaphthalene, carbazole and ethyl carbazole, and dehydrogenation: dehydrogenating the hydrogen absorption liquid under the action of a dehydrogenation catalyst to obtain a dehydrogenation liquid and purified hydrogen. According to the technology, organic matter is used for hydrogen absorption and hydrogen desorption, the hydrogen content in the carbon monoxide treatment gas is low and is smaller than or equal to 85 ppm, the purity of purified hydrogen is larger than or equal to 98%, and the purified hydrogen can be recycled. The method is insensitive to the concentration of hydrogen in the feed gas and can be used for treating carbon monoxide feed gas with the hydrogen volume ratio not larger than 20%, and organic liquid is recycled.

Description

technical field [0001] The invention relates to a raw material gas separation and purification process, in particular to a carbon monoxide raw material gas dehydrogenation separation and purification process. Background technique [0002] Carbon monoxide raw material gas is a commonly used chemical raw material, but because it contains hydrogen, it needs to be separated and purified before use. [0003] At present, the removal methods of hydrogen in carbon monoxide mainly include catalytic oxidation, low temperature separation and methanation. [0004] Among them, the catalytic oxidation method uses a catalyst to selectively oxidize hydrogen to generate water. This method requires the introduction of additional oxygen, and carbon monoxide will also be oxidized to carbon dioxide during dehydrogenation. During deep dehydrogenation, carbon monoxide will be oxidized in large quantities, resulting in loss of raw materials, and Once the hydrogen content in the raw material gas is...

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Problems solved by technology

However, when the carbon monoxide content is high in this method, carbon evolution reaction is also easy to occur and cause the reactor to overheat. At the same time, the methanation reaction will consume the raw material carbon monoxide and generate methane

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