C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/332, 23/385
C01B 17/04 (2006.01)
Patent
CA 1210570
ABSTRACT OF THE DISCLOSURE A three catalytic reactor system and process is disclosed for obtaining acceptable levels of sulfur recovery from acid gas at a cost significantly less than that required for a standard modified four reactor cold bed adsorption (CBA) system. The system and process uti- lize two conventional Claus reactors and one cold bed adsorption (CBA) reactor in series. Four condensers are provided, one disposed before each of the catalytic reac- tors and one on a process line connecting the third cata- lytic (CBA) reactor to the first catalytic reactor. The system is designed to operate either in a normal adsorp- tion mode or in a regeneration mode. In the normal adsorption mode, the second Claus reactor is operated at a closer sulfur dewpoint approach then the second Claus reactor in the standard CBA system. In the regeneration mode, gas downstream of the thermal reactor is directed first to the second Claus reactor and then, after removal of sulfur and reheating, to the CBA reactor. Thus, the second and third catalytic reactors are regenerated simul- taneously. The first catalytic reactor is placed on cold bed adsorption during the regeneration mode. Effluent from the first catalytic reactor is then passed through the second condenser and to the tail gas stack. 84163ART0202
459433
Amoco Corporation
Gowling Lafleur Henderson Llp
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