Process for recovering elemental sulfur from gases having a high

Details Process for recovering elemental sulfur from gases having a high Process for recovering elemental sulfur from gases having a high

1976-07-14

1977-11-29

Peters, G. O.

Chemistry of inorganic compounds

Sulfur or compound thereof

Elemental sulfur

423570, C01B 1704

Patent

active

040605957

ABSTRACT:
A process for recovering elemental sulfur from gases containing inorganic and/or organic sulfur compounds together with large quantities of carbon dioxide and other possible impurities such as unsaturated hydrocarbon and hydrogen cyanide. The waste gas is combined with a combustion-promoting gas and the resulting mixture is burned with a slight excess of air and caused to contact coke at a temperature of 300.degree. to 450.degree. C. The resulting gas, from which oxygen, sulfur trioxide and nitrogen oxide have been removed, by contact with the coke, is cooled to 20.degree. to 80.degree. C and then is scrubbed with aqueous alkali salts of weak inorganic and/or organic acids or amines to remove SO.sub.2. The absorbent is stripped and the recovered SO.sub.2 is reacted with hydrogen at 200.degree. to 400.degree. C to form sulfur and/or hydrogen sulfide and, when hydrogen sulfide is produced, the latter is reacted on alumina or activated carbon at 200.degree. to 300.degree. C to produce the elemental sulfur. All or part of the gas after recovery of the elemental sulfur is recycled.

REFERENCES:
patent: 3764665 (1973-10-01), Groenendaal
patent: 3794710 (1974-02-01), Merrill
patent: 3822337 (1974-07-01), Wunderlich et al.
patent: 3896215 (1975-07-01), Bratzler et al.
patent: 3970744 (1971-07-01), Riesenfeld
Bryant, H. S., "Oil & Gas Journal"; 3-26-73; pp. 70-75.

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