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US 3,989,811 AGranted
Process for recovering sulfur from fuel gases containing hydrogen sulfide, carbon dioxide, and carbonyl sulfide
AssigneeShell Oil Company
InventorEarl S. Hill
Life of this patent
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Abstract
Sour gas streams containing significant quantities of H.sub.2 S, CO.sub.2, and COS are contacted with an aqueous absorbent to remove the acid gases, the acid gases are described and contacted with a selective absorbent which rejects a substantial quantity of the CO.sub.2, and the H.sub.2 S enriched absorbent is stripped to produce a feed suitable for Claus units.
Claims12
A method for reducing the acid gas content of sour gases, comprising:
- A. contacting the sour gas in an absorption zone and absorbing the acid gases with a non-selective aqueous absorbent mixture and hydrolyzing the COS and producing a sweet product gas stream and an acid gas-loaded absorbent stream;
- B. stripping the acid gas-loaded absorbent stream and producing an acid gas stream containing principally H.sub.2 S and CO.sub.2 ;
- C. selectively absorbing H.sub.2 S from the acid gas stream to produce a CO.sub.2 containing stream and an H.sub.2 S-rich absorbent;
- D. regenerating the H.sub.2 S-rich absorbent to produce an acid gas stream containing H.sub.2 S;
- E. recovering the H.sub.2 S in the acid gas stream as elemental sulfur by oxidation of the H.sub.2 S with an oxygen containing gas.
2 more elements
Dependencies are inferred from the claim text.