Patent ID: 8268044

Claim:
A method for separating a feed stream, comprising at least H 2 S, CO and H 2 , into at least a CO 2 product stream and an H 2 or H 2 and CO product stream (the “H 2 /CO product stream”), wherein the feed stream is formed from a sour syngas stream obtained from gasification of a solid or liquid carbonaceous feedstock and is separated using a pressure swing adsorption system (the “H 2 /CO-PSA system”), an H 2 S removal system, and a further separation system, and wherein: the feed stream is introduced into either the H 2 /CO-PSA system or the H 2 S removal system; the H 2 /CO-PSA system either separates the feed stream to provide the H 2 /CO product stream and a stream enriched in CO 2 and H 2 S, or separates a stream already depleted in H 2 S by the H 2 S removal system to provide the H 2 /CO product stream and a stream enriched in CO 2 and depleted in H 2 S; the H 2 S removal system either processes the feed stream to provide a stream depleted in H 2 S, or processes a stream already enriched in CO 2 and H 2 S by the H 2 /CO-PSA system to provide a stream enriched in CO 2 and depleted in H 2 S, or processes a stream already enriched in CO 2 and H 2 S by the H 2 /CO-PSA system and further enriched in CO 2 and H 2 S by the further separation system to provide the CO 2 product stream; and the further separation system either separates a stream already enriched in CO 2 and H 2 S by the H 2 /CO-PSA system to provide a stream further enriched in CO 2 and H 2 S and a stream comprising H 2 or H 2 and CO, or separates a stream already enriched in CO 2 by the H 2 /CO-PSA system and depleted in H 2 S by the H 2 S removal system to provide the CO 2 product stream and a stream comprising H 2 or H 2 and CO.