Carbon monoxide raw material gas dehydrogenation separation and purification process

Abstract

The invention relates to a carbon monoxide raw material gas dehydrogenation separation and purification process, comprising the following two steps: absorbing hydrogen, using an organic liquid to absorb hydrogen from the carbon monoxide raw material gas under the action of a hydrogen absorbing catalyst, to obtain hydrogen absorbing liquid and carbon monoxide treatment gas; Wherein, the organic liquid is selected from at least one of cyclohexane, tetralin, carbazole, and ethyl carbazole; for dehydrogenation, under the action of a dehydrogenation catalyst, the hydrogen-absorbing liquid is dehydrogenated to obtain Dehydrogenation liquid and purified hydrogen. This technology uses organic matter to absorb and release hydrogen, so that the hydrogen content in the carbon monoxide treatment gas is low, less than or equal to 85ppm, and the purified hydrogen has a purity of ≥98%, which can be recycled. It is insensitive to the hydrogen concentration in the raw material gas, and can be used to treat carbon monoxide raw material gas with a hydrogen volume ratio not greater than 20%, and the organic liquid can be 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...

AI Technical Summary

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

Images