Fluid catalytic cracking process

Details Fluid catalytic cracking process Fluid catalytic cracking process

C - Chemistry, Metallurgy

10

G

196/106

C10G 11/14 (2006.01) B01J 8/26 (2006.01) C10G 11/18 (2006.01)

Patent

CA 1125687

FLUID CATALYTIC CRACKING PROCESS ABSTRACT An improvement in the fluid cracking process is obtained by contacting the hydrocarbon feed in a riser reaction zone first with a recycled coke-containing spent catalyst and then contacting the resultant mixture with freshly regenerated catalyst to produce the desired conversion of the hydrocarbon feed and a coke- containing spent catalyst, a portion of the spent catalyst being recycled without regeneration to the inlet of the reaction zone and the remainder being regenerated and returned to an inter- mediate point in the reaction zone. The recycled coke-containing spent catalyst has sufficient activity so that the highly reactive nitrogen and carbon residue containing hydrocarbon contaminants in the oil feed will deposit on the spent catalyst and thus mini- mize the deactivation of the freshly regenerated catalyst used in the subsequent cracking of the oil feed. By contacting the oil feed first with the recycled spent catalyst, this invention allows the refiner to utilize the full activity and selectivity characteristics of the freshly regen- erated catalyst in order to obtain higher yields of the desired products from the cracking operations.

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