Process of decreasing the sulfur content of exhaust gases obtain

Chemistry of inorganic compounds – Sulfur or compound thereof – Elemental sulfur

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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in the tail gas are chemically reacted to form elementary sulfur in a tail gas-desulfurizing plant and the sulfur is withdrawn.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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