Catalytic cracking process with the production of high octane gasoline

Claim 1

IN A CATALYST CRACKING PROCESS WHEREIN A HYDROCARBON OIL HAVING A BOILING RANGE OF ABOUT 400* TO 1000*F. IS CONTACTED WITH A CRACKING CATALYST AT A TEMPERATURE OF ABOVE ABOUT 750*F. TO ABOUT 1000*F. IN A CONVERSION ZONE, USED CATALYST AND REACTION PRODUCTS INCLUDING A GASOLINE FRACTION OF ENHANCED OCTANE NUMBER AND AN END BOILING POINT OF ABOUT 350*F. ARE SEPERATED, THE IMPROVEMENT WHEREBY GAS AND COKE FORMATION ARE REDUCED AND THE YEILD OF SAID GASOLINE FRACTION IS INCREASED WHICH COMPRISES SEPARATING A HEAVY GASOLINE FRACTION BOILING IN THE RANGE OF ABOUT 350* TO 425*F. FROM SAID REACTION PRODUCTS, SEPARATING HYDROGENATING SAID HEAVY GASOLINE FRACTION AT A TEMPERATURE OF ABOUT 600* TO 750*F. AT A PRESSURE OF ABOUT 400 TO 850 P.S.I. IN THE PRESENCE OF A CATALYST AND ABOUT 1 TO 10 MOLS OF HYDROGEN PER MOL OF SAID HEAVY GASOLINE FRACTION AT A MINIMUM SPACE VELOCITY OF ABOUT 0.5 TO SUBSTANTIALLY SATURATED THE OLEFIN HYDROCARBON CONTENT THEREOF, SEPARATELY REGENERATING SAID USED CATALYST AT A TEMPERATURE OF ABOVE SAID REACTION TEMPERATURE TO PRODUCE REGENERATED CATALYST AT A TEMPERATURE OF ABOUT 1000* TO 1250*F., CONTACTING SAID SUBSTANTIALLY SATURATED HEAVY GASOLINE FRACTION WITH SAID HOT REGENERATED CATALYST FOR ABOUT 0.5 TO 5 SECONDS IN A SEPARTE REACTION ZONE TO INDUCE CRACKING OF THE REFRACTORY CONSTITUENTS THEREIN, MIXING INCOMING FEED HYDROCARBON OIL WITH SAID CRACKED HEAVY GASOLINE FRACTION AND REGENERATED CATALYST AND CONDUCING THE MIXTURE TO SAID CONVERSION ZONE.