Scrubbing system yielding high concentration of hydrogen sulfide

Details Scrubbing system yielding high concentration of hydrogen sulfide Scrubbing system yielding high concentration of hydrogen sulfide

1981-12-08

1984-02-07

Thomas, Earl C.

Chemistry of inorganic compounds

Sulfur or compound thereof

Elemental sulfur

423226, 55 68, 55 73, 422169, 422189, C01B 1704, B01J 1400

Patent

active

044303165

ABSTRACT:
In a system for the separation of sour gases especially hydrogen sulfide and carbon dioxide from a raw gaseous mixture e.g., hydrogen-containing in order to form a purified gaseous mixture, comprising scrubbing the gaseous mixture in a first scrubbing stage with a physical scrubbing liquid e.g., methanol having a higher absorbability for hydrogen sulfide than for carbon dioxide, withdrawing from the scrubbing stage a first stream of scrubbing liquid loaded with hydrogen sulfide and carbon dioxide, and regenerating the loaded scrubbing liquid to form (a) a gaseous phase containing hydrogen sulfide, and (b) regenerated scrubbing liquid, the improvement of scrubbing said gaseous phase containing hydrogen sulfide in a second scrubbing stage with a stream of scrubbing liquid capable of absorbing additional H.sub.2 S, e.g., a CO.sub.2 -depleted stream from an H.sub.2 S enrichment column; and subjecting resultant second stream of scrubbing liquid loaded with hydrogen sulfide to a separation stage, preferably rectification, to form a bottoms of regenerated scrubbing liquid and an overhead of a gaseous phase rich in hydrogen sulfide irrespective of whether the raw gaseous mixture has a very low H.sub.2 S concentration.

REFERENCES:
patent: 3710546 (1973-01-01), Grunewald et al.
patent: 3989811 (1976-11-01), Hill
patent: 4276057 (1981-06-01), Becker et al.
patent: 4289738 (1981-09-01), Pearce et al.
patent: 4324567 (1982-04-01), Ranke et al.
Ranke; Gerhard, "Advantages of the Rectisol-Wash Process in Selective H.sub.2 S Removal from Gas Mixtures", Linde Reports on Science and Technology, 18/1973, pp. 7-13.

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