Production of sulfur from Claus process waste gas

Details Production of sulfur from Claus process waste gas Production of sulfur from Claus process waste gas

1977-09-26

1978-06-27

Peters, G. O.

Chemistry of inorganic compounds

Sulfur or compound thereof

Elemental sulfur

423576, C01B 1704

Patent

active

040975851

ABSTRACT:
In the Claus process wherein hydrogen sulfide and sulfur dioxide are reacted to form sulfur and a waste exhaust gas, the invention treats the exhaust gas to recover additional sulfur therefrom. This is done by
(a) catalytically hydrogenating the exhaust gas with a hydrogen containing gas to form hydrogen sulfide from the sulfur and residual sulfur in such exhaust gas;
(b) simultaneously with step (a) catalytically hydrolyzing the carbon oxysulfide and carbon disulfide contained in the exhaust gas with steam to form hydrogen sulfide;
(c) oxidizing part of at least one of the hydrogen sulfide contained in the initial feed gas and the ultimate sulfur product with air in stoichiometric or slightly less amount to form sulfur dioxide;
(d) adding the sulfur dioxide produced in step (c) to the hydrogen sulfide-containing exhaust gas which has been subjected to steps (a) and (b) in an amount to establish a ratio of hydrogen sulfide to sulfur dioxide of about 2 : 1;
(e) catalytically reacting the hydrogen sulfide still contained in the exhaust gas after step (d) with sulfur dioxide at about 100.degree. to 150.degree. C to form sulfur, and recovering the sulfur; and
(f) regenerating the catalyst with an oxygen-free hot gas containing hydrogen sulfide.

REFERENCES:
patent: 3717699 (1973-02-01), Nicklin et al.
patent: 3752877 (1973-08-01), Beavon
patent: 4035474 (1977-07-01), Kunkel et al.

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