Process for removing H.sub.2 S from sour gases with generation o

Details Process for removing H.sub.2 S from sour gases with generation o Process for removing H.sub.2 S from sour gases with generation o

1980-07-22

1981-09-15

Thomas, Earl C.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Carbon dioxide or hydrogen sulfide component

423220, 423229, 423574R, B01D 5334

Patent

active

042897386

ABSTRACT:
Sour industrial gases containing carbon dioxide and hydrogen sulfide are treated with amines to remove the CO.sub.2 and H.sub.2 S. The amine absorbent containing or loaded with H.sub.2 S and CO.sub.2 is regenerated and the off-gas containing concentrated amounts of H.sub.2 S and CO.sub.2 is treated in a second amine absorber to produce an amine absorbent loaded with H.sub.2 S. This amine is then regenerated to provide an off-gas containing a high ratio of H.sub.2 S to CO.sub.2 which makes it suitable for use as the feed gas to a sulfur recovery unit such as a Claus plant. The process is automatically controlled so that the concentration of H.sub.2 S in the second amine absorber is built up to and controlled at a desired set point so that the off-gas has the required H.sub.2 S/CO.sub.2 ratio.

REFERENCES:
patent: 3989811 (1976-11-01), Hill
patent: 4001386 (1977-01-01), Klein et al.
patent: 4025322 (1977-05-01), Fisch
patent: 4085199 (1978-04-01), Singleton et al.
patent: 4198387 (1980-04-01), Laslo et al.
patent: 4210627 (1980-07-01), Verloop et al.

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