Composition for removing sulfur oxides from a gas

Details Composition for removing sulfur oxides from a gas Composition for removing sulfur oxides from a gas

1980-12-29

1983-01-18

Dees, Carl F.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

208120, 423244, B01J 2906

Patent

active

043691307

ABSTRACT:
Sulfur oxides are removed from a gas by an absorbent comprising at least one inorganic oxide selected from the group consisting of the oxides of aluminum, magnesium, zinc, titanium, and calcium in association with at least one free or combined rare earth metal selected from the group consisting of lanthanum, cerium, praseodymium, samarium, and dysprosium, wherein the ratio by weight of inorganic oxide or oxides to rare earth metal or metals is from about 0.1 to about 30,000. Absorbed sulfur oxides are recovered as a sulfur-containing gas comprising hydrogen sulfide by contacting the spent absorbent with a hydrocarbon in the presence of a hydrocarbon cracking catalyst at a temperature from about 375.degree. to about 900.degree. C. The absorbent can be circulated through a fluidized catalytic cracking process together with the hydrocarbon cracking catalyst to reduce sulfur oxide emissions from the regeneration zone.

REFERENCES:
patent: 3930987 (1976-01-01), Grand
patent: 4071436 (1978-01-01), Blanton, Jr. et al.
patent: 4153534 (1979-05-01), Vasalos
patent: 4206039 (1980-06-01), Vasalos
patent: 4221677 (1980-09-01), Vasalos et al.

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