Mineral oils: processes and products – Chemical conversion of hydrocarbons – Cracking
Reexamination Certificate
2005-07-12
2005-07-12
Langel, Wayne A. (Department: 1754)
Mineral oils: processes and products
Chemical conversion of hydrocarbons
Cracking
C208S121000, C208S122000, C208S123000, C208S124000, C252S373000, C502S038000, C502S039000, C502S049000
Reexamination Certificate
active
06916417
ABSTRACT:
The present invention provides a catalytic cracking process. The process includes introducing at least one species of a natural or synthetic residuum containing feedstock and a catalyst into a catalytic cracker reaction zone, and thereafter cracking the feedstock into a lower molecular weight gaseous product and spent cracking catalyst with hydrocarbonaceous product deposited thereon. Among others, the lower molecular weight gaseous product includes ethylene or propylene. The spent cracking catalyst obtained from the catalytic cracker reaction zone may then be regenerated using a first and a second regeneration zone. The first regeneration zone may be operated in an oxidizing mode resulting in a remaining coke of reduced hydrogen content which lowers the moisture content of flue gas in subsequent regeneration zones. The second regeneration zone, may be operated in a partial oxidizing mode and with a controlled carbon dioxide content in the second combustion atmosphere as a reactant with carbon for forming additional carbon monoxide in the flue gas of the second regeneration zone.
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