Abstract: A process for (i) fluid catalytic cracking in a cracking zone of residuum and other heavy oils comprising gas oil, petroleum residue, reduced and whole crudes, and shale oils with high metals content, (ii) wherein the coke deposits on the used cracking catalyst are reduced in amount by regeneration and wherein (iii) contaminant metals comprising nickel, vanadium, copper and iron deposited on the used cracking catalyst are deactivated in sufficient amount to reduce hydrogen and coke formation during the cracking process whereby the said catalyst is suitable for re-use wherein (A) the catalyst particles are contacted with fresh feed and associated recycle feed, and wherein (B) the feed is cracked in a cracking zone, wherein (C) the used catalyst particles are subjected to alternate exposures of up to 30 minutes in duration of conditions comprising (a) an oxidizing zone at a temperature of above 900.degree. F. wherein molecular oxygen in flue gas emitted from the oxidizing zone is over 0.

Abstract: An apparatus for the fluidized catalytic cracking of hydrocarbons comprising two independent transfer line reactors, each of which is associated with an independent cyclone separation system and wherein the cyclone separation systems are located within a common reactor vessel. The apparatus is suitable for use in the simultaneous fluidized catalytic cracking of dissimilar hydrocarbon feedstocks without commingling either the feedstocks or the products therefrom.

Abstract: A cyclic, fluidized catalytic cracking process providing reduced emissions of noxious effluents in regeneration zone flue gases is operated with regenerable, fluidized, solid particles which are circulated throughout the catalytic cracking process cycle and which comprise (1) a cracking catalyst, (2) a metallic reactant which reacts with a sulfur oxide to form a metal- and sulfur-containing compound in the solid particles, and (3) a metallic oxidation promoter.

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 a sulfur oxide to form a metal- and sulfur-containing compound in the solid particles. The method involves regeneration of the cracking catalyst in the presence of a metallic oxidation promoter which can also be a component of the solid particles.

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 a sulfur oxide to form a metal- and sulfur-containing compound in the solid particles. The method involves regeneration of the cracking catalyst in the presence of a metallic oxidation promoter which can also be a component of the solid particles.