Process of decreasing the sulfur content of exhaust gases obtain

Details Process of decreasing the sulfur content of exhaust gases obtain Process of decreasing the sulfur content of exhaust gases obtain

1981-09-16

1983-09-20

Thomas, Earl C.

Chemistry of inorganic compounds

Sulfur or compound thereof

Elemental sulfur

423576, 423222, C01B 1704

Patent

active

044055935

ABSTRACT:
In a process of decreasing the sulfur content of exhaust gases obtained during the recovery of sulfur from acid gases containing H.sub.2 S and other S-containing compounds in the Claus process, the acid gases which contain H.sub.2 S and other S-containing compounds are reacted in a Claus plant to form elemental sulfur. A gas which contains H.sub.2 S or SO.sub.2 is subsequently added at a controlled rate to maintain a stoichiometric ratio of 2:1 of H.sub.2 S to SO.sub.2 in the tail gas from the Claus plant. The gas which contains H.sub.2 S or SO.sub.2 may be added to the tail gas from the Claus plant or before the last contacting stage of a multistage Claus plant. During the addition of a gas which contains H.sub.2 S, the Claus plant can be operated at an H.sub.2 S to SO.sub.2 ratio of or below 2:1. During the addition of a gas which contains SO.sub.2 the Claus plant can be operated at an H.sub.2 S to SO.sub.2 ratio of or above 2:1. The H.sub.2 S and SO.sub.2 contained in the tail gas are chemically reacted to form elementary sulfur in a tail gas-desulfurizing plant and the sulfur is withdrawn.

REFERENCES:
patent: 3317281 (1967-05-01), Grekel
patent: 3939250 (1976-02-01), Michel et al.
patent: 4097585 (1978-06-01), Fischer
patent: 4100266 (1978-07-01), Smith
patent: 4341753 (1982-07-01), Mori et al.

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