Chemistry of inorganic compounds – Sulfur or compound thereof – Elemental sulfur
Patent
1983-07-29
1984-12-11
Thomas, Earl C.
Chemistry of inorganic compounds
Sulfur or compound thereof
Elemental sulfur
423576, 422115, 422171, C01B 1704
Patent
active
044877544
ABSTRACT:
A straight-through four reactor system and process is disclosed for obtaining high levels of sulfur recovery from acid gas at a cost equal to or less than that required for a standard modified four reactor Claus system. Two conventional Claus reactors and two cold bed adsorption (CBA) reactors are in series. Four condensers are provided, one disposed before each of the Claus and CBA catalytic reactors. A first heater and a first bypass line is disposed between the second condenser and the second catalytic reactor (second Claus reactor) and a second heater and a second bypass line is disposed between the third condenser and the third catalytic reactor (first CBA reactor). The system is designed to operate either with both CBA reactors in a recovery mode or with one CBA reactor in a regeneration mode and the other CBA reactor in a recovery mode. When both reactors are operating in the recovery mode, the system is similar to the standard modified Claus system. But when one of the CBA reactors is in a regeneration mode, effluent from the third condenser is heated in the second heater and directed to the CBA reactor on regeneration. Sulfur is vaporized from the regenerating CBA reactor and is recovered in the fourth condenser. Effluent from the fourth condenser is then passed through the CBA reactor in recovery mode before it passes to the incinerator.
REFERENCES:
patent: Re28830 (1976-05-01), Hunt, Jr. et al.
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patent: 4035474 (1977-07-01), Kunkel et al.
patent: 4180554 (1979-12-01), Goddin, Jr. et al.
patent: 4309402 (1982-01-01), Al-Muddaris
patent: 4315904 (1982-02-01), Lell et al.
"MCRC Process for Improving Claus Plant Recovery"-A. B. Coady 6-9-1976: Presented to Canadian Natural Gas Processor's Association.
"MAXISULF-A Process to Enhance Sulphur Recovery in Claus Plants"-R. Lell and U. Neumann, Davy McKee AG.
"The MCRC Sub-Dewpoint Sulphur Recovery Process"-R. E. Heigold and D. E. Berkeley, Delta Projects Limited.
Russel Jeffrey E.
Standard Oil Company (Indiana)
Thomas Earl C.
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