Selective acid gas removal

Details Selective acid gas removal Selective acid gas removal

1982-04-19

1983-11-01

Thomas, Earl C.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Carbon dioxide or hydrogen sulfide component

423228, 423243, 423416, B01D 5334

Patent

active

044129777

ABSTRACT:
An integrated process to selectively remove and separate H.sub.2 S, CO.sub.2 and COS from a feed gas stream is disclosed. The process involves three separate absorption/regeneration steps. In the first step the feed gas is contacted with an absorbent solution to selectivity remove CO.sub.2 and H.sub.2 S but not COS. The COS-rich stream is then contacted in another stage to selectively remove the COS. After stripping the CO.sub.2 and H.sub.2 S gaseous stream from the first stage, the acid gas stream is contacted with a separate absorption stream to selectively remove the H.sub.2 S. As a result four separate gaseous streams are produced--a purified acid gas-free stream, a COS stream, an H.sub.2 S stream and a CO.sub.2 stream.

REFERENCES:
patent: 3965244 (1976-06-01), Sykes, Jr.
patent: 3989811 (1976-11-01), Hill
patent: 4368059 (1983-01-01), Doerges et al.

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