C - Chemistry – Metallurgy – 10 – K
Patent
C - Chemistry, Metallurgy
10
K
23/343, 48/46
C10K 1/16 (2006.01) C01B 3/16 (2006.01) C10K 1/34 (2006.01) C10K 3/04 (2006.01)
Patent
CA 1123603
211-P-US?2?91 PROCESS FOR PRODUCING HYDROGEN FROM SYNTHESIS GAS CONTAINING COS ABSTRACT OF THE INVENTION Process for treating synthesis gas to recover a purified essentially sulfur-free hydrogen-rich stream. The novel sequence of operations employed comprises initially removing from the feed gas, such as from a synthesis gas derived from partial oxidation of coal or oil, the bulk of contained H2S and a substantial part of the contained COS, by physical absorption in a suitable solvent. The gas from the initial absorption is then subjected to water- gas shift reaction over a sulfur-resistant shift catalyst under conditions such that in addition to the conversion of CO to CO2 most of the contained COS is hydrolyzed to H2S. The gaseous shift product is then subjected to a second treatment with suitable solvent to remove by physical absorption essentially all of the remaining sulfur, which is then present as H2S. The thus desul- furized gas mixture is then sent to a CO2 absorber, from which a H2-rich gas effluent is withdrawn. The H2S bearing solvent from the second treatment is used in the initial absorbtion. H2S is stripped from the initial rich absorption bottoms liquid to recover a Claus gas effluent of high H2S content, while the stripped liquid bottoms are recycled for further use in the process. .
346465
Air Products And Chemicals Inc.
Mcfadden Fincham
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