Catalytic cracking
AssigneeTexaco Inc.
InventorsDale Williams, John C. Strickland
Life of this patent
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Abstract
A fluid catalytic cracking process and apparatus in which a plurality of hydrocarbon feedstocks including at least one normally gaseous paraffinic hydrocarbon feedstock and at least one normally liquid hydrocarbon feedstock are subjected to cracking reaction conditions in a common transport type reaction zone in the presence of a zeolite cracking catalyst. Fresh hot regenerated catalyst is first contacted with a normally gaseous paraffinic hydrocarbon under dehydrogenation reaction conditions effecting conversion to normally gaseous olefins, and fresh normally liquid cracking charge stock is contacted in the reaction zone under cracking reaction conditions with the gaseous paraffinic and olefinic hydrocarbons.
Claims11
A process for the production of normally gaseous olefins from a hydrocarbon feedstock in a transport type fluid catalytic cracking reaction zone in the presence of a zeolite catalyst in which fresh feedstock is brought into contact with hot regenerated catalyst in a riser reaction zone, which comprises charging heavy hydrocarbon charge stock to an upper section of a riser reaction zone near its discharge end, charging a normally gaseous C.sub.2 to C.sub.3 rich paraffinic charge stock into the lowermost portion of said riser reaction zone into contact with hot freshly regenerated catalyst and introducing a paraffinic normally liquid naphtha or gas oil into a section of said riser reaction zone intermediate said lower and upper sections of said riser reaction zone.
A process for the production of normally gaseous olefins from a virgin hydrocarbon feedstock in a transport type fluid catalytic cracking reaction zone in the presence of a zeolite catalyst in which fresh feedstock is brought into contact with hot regenerated catalyst in a riser reaction zone, which comprises charging said fresh charge stock to an upper section of a riser reaction zone near its discharge end, charging a normally gaseous C.sub.2 to C.sub.3 rich paraffinic charge stock into the lowermost portion of said riser reaction zone into contact with hot freshly regenerated catalyst and introducing a recycle naphtha or gas oil separated from the products from said cracking reaction into a section of said riser reaction zone intermediate said lower and upper sections of said riser reaction zone.
Dependencies are inferred from the claim text.