Fluid catalytic cracking

Details Fluid catalytic cracking Fluid catalytic cracking

1980-08-22

1982-08-17

Thomas, Earl C.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Sulfur or sulfur containing component

208113, 252464, B01D 5334

Patent

active

043449263

ABSTRACT:
Gaseous sulfur compounds are removed from a sulfur-containing gas mixture by reacting sulfur oxides in the gas mixture with alumina in association with bismuth.
The process is particularly useful in fluid catalytic cracking of sulfur-containing petroleum charge stocks wherein sulfur is contained in coke deposited on the fluidized cracking catalyst. By the process of this invention, sulfur oxides may be removed from regenerator off-gases from a fluidized catalytic cracking unit by incorporating particulate alumina impregnated with bismuth in particulate cracking catalyst whereby sulfur oxides generated in the regeneration of the catalyst are reacted with bismuth-impregnated alumina. Sulfur oxides produced during regeneration of the catalyst by burning the coke with air are captured and converted to hydrogen sulfide in the cracking reactor. The hydrogen sulfide so produced is readily separated from petroleum products of the catalytic cracking reaction process.

REFERENCES:
patent: 4071436 (1978-01-01), Blanton et al.
patent: 4115250 (1978-09-01), Flanders et al.
patent: 4115251 (1978-09-01), Flanders et al.
patent: 4284494 (1981-08-01), Bartholic et al.
Lowell et al., "Selection of Metal Oxides for Removal of SO.sub.2 from Flue Gas", Ind. Eng. Chem. Process Des. Develop., vol. 10, No. 3, 1971, pp. 384-390.

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