Process for recovering a pure carbon monoxide fraction
AssigneeLinde Aktiengesellschaft
InventorsHeinz Bauer, Rainer Fabian
Life of this patent
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Abstract
In the recovery of a pure CO fraction from a charge containing hydrogen, carbon monoxide and methane from which water and carbon dioxide have optionally been removed, the charge is cooled and partially condensed; and the carbon monoxide is scrubbed out with supercooled liquid methane. The resultant hydrogen is stripped out, and the recovered CO/CH.sub.4 -rich fraction is separated by rectification to obtain a pure CO fraction and a CH.sub.4 -rich fraction. The supercooled liquid methane used as the scrubbing agent contains at least 2 to 15 mol % carbon monoxide, preferably 7 to 10 mol % carbon monoxide. Also, the hydrogen stripper and methane scrubbing column can be combined in a single column.
Claims4
In a process for recovering a pure CO fraction from a charge containing at least hydrogen, carbon monoxide and methane, comprising cooling and partially condensing the charge, scrubbing the resultant charge with supercooled liquid methane scrubbing agent to remove carbon monoxide from the charge and provide a liquid containing methane, carbon monoxide and hydrogen, stripping hydrogen from said liquid so as to obtain an enriched CO/CH.sub.4 fraction, and subjecting said enriched CO/CH.sub.4 fraction to rectification to separate out a pure CO fraction and an enriched CH.sub.4 fraction, the improvement which comprises employing as the supercooled liquid methane scrubbing agent, a liquid methane scrubbing agent containing at least 2 to 15 mol % carbon monoxide.
Dependencies are inferred from the claim text.