C - Chemistry – Metallurgy – 10 – G
Patent
C - Chemistry, Metallurgy
10
G
196/106
C10G 11/12 (2006.01)
Patent
CA 1048951
CATALYTIC CRACKING WITH REDUCED EMISSION OF NOXIOUS GASES ABSTRACT A cyclic, fluidized catalytic cracking process providing reduced emissions of noxious effluents in regeneration zone flue gases is operated with homogeneous or non-homogeneous, regenerable, fluidized, solid particles which are circulated throughout the catalytic cracking process cycle and which comprise (1) a molecular sieve-type cracking catalyst, comprising a cracking catalyst matrix containing crystalline aluminosilicate distributed throughout said matrix and (2) a metallic reactant which reacts with sulfur oxides in the regeneration zone. This divisional case discloses cracking a feedstock at a temperature from about 850° to about 1,200°F in the presence of particles of a molecular sieve-type cracking catalyst in admixture with fluidizable particles which contain a metallic reactant, wherein said metallic reactant consists of at least one free or combined metallic element which is selected from the group consisting of sodium, scandium, titanium, iron, chromium, molybdenum, manganese, cobalt, nickel, antimony, copper, zinc, cadmium, the rare earth metals, and lead, and wherein said metallic reactant is present in sufficient amount to effect the absorption of at least about 50% of the sulfur oxides produced by said burning of sulfur-containing carbonaceous deposits in the regeneration zone.
302247
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