Process for producing elemental sulfur from an H.sub.2 S-contain

Details Process for producing elemental sulfur from an H.sub.2 S-contain Process for producing elemental sulfur from an H.sub.2 S-contain

1992-03-26

1993-11-16

Straub, Gary P.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Carbon dioxide or hydrogen sulfide component

423222, 423230, 4232421, 42324409, 4232441, 423576, 4235741, C01B 1716

Patent

active

052621359

ABSTRACT:
The gas to be treated contains H.sub.2 S and carbon compounds first enters the combustion chamber of a Claus process plant and a gas mixture which contains 1 to 3 moles H.sub.2 S per mole of SO.sub.2 is withdrawn from that combustion chamber. The gas mixture is reacted in part to form elemental sulfur in at least one catalytic Claus process stage at temperatures above the dew-point temperature of the sulfur. The elemental sulfur is condensed in and removed from a sulfur cooler. An exhaust gas which contains 0.5 to 5% by volume H.sub.2 S and also contains COS, CS.sub.2 and H.sub.2 O is withdrawn from the last sulfur cooler of the Claus process plant. Oxygen is admixed with that exhaust gas, which is heated to a temperature of at least 200.degree. C. and is contacted with a catalyst, which comprises at least 80% by weight TiO.sub.2. The resulting elemental sulfur is condensed and withdrawn. The gas is subsequently contacted at temperatures of 120.degree. to 160.degree. C. with a catalyst which comprises at least 80% by weight Al.sub.2 O.sub.3.

REFERENCES:
patent: 4097585 (1978-06-01), Fischer
patent: 4544534 (1985-10-01), Dupin et al.
patent: 4623533 (1986-11-01), Broecker et al.
patent: 4857297 (1989-08-01), Kettner et al.
patent: 4933163 (1990-06-01), Fischer et al.
Ullmanns Encykolpadie der Technischen Chemie, 4th Edition, (1982), Jul., vol. 21, pp. 8-26.

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