Chemistry of inorganic compounds – Sulfur or compound thereof – Elemental sulfur
Patent
1986-04-17
1988-11-01
Doll, John
Chemistry of inorganic compounds
Sulfur or compound thereof
Elemental sulfur
423221, 423514, B01D 5334, C01B 1705
Patent
active
047819103
ABSTRACT:
The present invention is directed to a process for removing H.sub.2 S from a gaseous stream, preferably a natural gas stream, which comprises forming a buffered aqueous H.sub.2 S stream containing thiosulfate by contacting the gaseous stream with water containing a buffering agent and thiosulfate to remove the H.sub.2 S from the other gases in the gaseous stream; introducing the buffered aqueous H.sub.2 S stream into a reduction section under conditions wherein elemental sulphur is produced and removing an effluent stream from the reduction section; introducing the reduction section effluent into an oxidation section and contacting the effluent with air to react the oxygen in the air with the H.sub.2 S in the effluent stream to produce predominantly thiosulfate, the volume of liquid fed to the oxidation section being in excess of the volume of gas fed, and removing an effluent stream from the oxidation section; separating the effluent stream from the oxidation section into a gas stream and a liquid stream; and treating separately the gas stream and the liquid stream to remove H.sub.2 S from each stream and additionally to recover elemental sulfur from the liquid stream.
REFERENCES:
patent: 1809818 (1931-06-01), Bragg
patent: 4444571 (1984-04-01), Matson
patent: 4579727 (1986-04-01), Cronkright et al.
Industrial Pollution-Control Handbook, Lund, ed., McGraw-Hill Book Co., 1971, pp. 7-4, 7.
Chemical Engineers' Handbook, 5th ed., Perry & Chilton, Eds., McGraw-Hill Book Co., 1973, pp. 18-67.
Gas Purification, 3rd ed., Kohl-Riesenfeld, Gulf Publishing Co., 1979, pp. 472-473.
Chemical Reaction Engineering, 2nd ed., Levenspiel, John Wiley & Sons, 1972, pp. 144-149.
Doll John
Rose David A.
Russel Jeffrey Edwin
W. Bruce Smith and Butler & Binion
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