Chemistry of inorganic compounds – Sulfur or compound thereof – Elemental sulfur
Patent
1985-04-23
1986-12-30
Doll, John
Chemistry of inorganic compounds
Sulfur or compound thereof
Elemental sulfur
B01D 5336, C01B 1704
Patent
active
046328190
ABSTRACT:
The feed gas is partially burnt with oxygen-containing gas in a thermal Claus process plant, in which temperatures in the range of 850.degree. to 1350.degree. C. is maintained. Product gas which has been produced is passed through a catalytic Claus process plant (Claus catalysis plant), from which sulfur is withdrawn. The exhaust gas from the Claus catalysis plant is supplied to a desulfurizing plant. The sulfur compounds in the exhaust gas of the desulfurizing plant are converted to SO.sub.2 in a thermal aftertreating unit. When the rate of the H.sub.2 S-containing feed gas is below a limit, which is between 20 to 35% of the total rate of feed gas permissible for the thermal Claus process plant, then recycled exhaust gas from the desulfurizing plant (recycle gas) is admixed to the feed gas at such a rate that the rate of the mixed feed and recycle gases exceeds that limit. The recycle gas is suitably heated to 200.degree. to 400.degree. C. before it is mixed with the feed gas.
REFERENCES:
patent: 2413714 (1947-01-01), Keeling
patent: 3531251 (1970-09-01), Brogdon
patent: 3681024 (1972-08-01), Hujsak et al.
patent: 3860697 (1975-01-01), Palm
Fischer Herbert
Kriebel Manfred
Doll John
Dubno Herbert
Metallgesellschaft AG
Ross Karl F.
Russel Jeffrey E.
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