Process for removing sulfur oxides from a gas

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

1981-07-31

1983-05-03

Gantz, Delbert E.

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Cracking

208120, 252441, 252455Z, 252457, 423244, C10G 1104, C10G 1118

Patent

active

043819915

ABSTRACT:
Sulfur oxides are removed from a gas by an absorbent comprising magnesium oxide 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: 3835031 (1974-09-01), Bertolacini et al.
patent: 4071436 (1978-01-01), Blanton et al.
patent: 4146463 (1979-03-01), Radford et al.
patent: 4206039 (1980-06-01), Vasalos

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