Process for recovering catalyst particles in residual oils obtained in the conversion of hydrocarbon oils

Claim 1

A PROCESS FOR TREATING A HYDROCARBON OIL BOILING ABOVE THE GASOLINE RANGE COMPRISING CONTACTING SAID HYDROCARBON OIL IN A CRACKING ZONE WITH A CRACKING CATALYST HAVING A PARTICLE SIZE OF ABOUT 20 TO 150 MICRONS UNDER FLUIDIZED CRACKING CONDITIONS, REMOVING THE CRACKING EFFLUENT CONTAINING A SMALL AMOUNT OF SAID CRACKING CATALYST, FRACTIONATING THE CRACKING EFFLUENT CONTAINING SAID EFFLUENT CATALYST PARTICLES TO RECOVER GASOLINE AND MATERIALS IN THE GAS OIL RANGE, REMOVING FROM THE FRACTIONATOR RESIDUAL MATERIAL HIGHER BOILING THANSAID GAS OIL AND CONTAINING SAID EFFLUENT CRACKING CATALYST, CONVEYING SAID RESIDUAL AND EFFLUENT CATALYST TO A COKING ZONE WHERE SAID MATERIAL IS SUBJECTED IN A FLUIDIZED STATE TO TEMPERATURES OF ABOUT 800 TO 1200*F. TO COKE SAID RESIDUAL ON SAID EFFLUENT CATALYST PARTICLES, RECOVERING AN OVERHEAD PRODUCT, REMOVING COKE FROM SAID COKE-BEARING CATALYST BY BURNING AND PASSING RESULTING DECOKED CATALYST PARTICLES TO SAID CRACKING ZONE; SAID OVERHEAD PRODUCT FROM THE COKING ZONE BEING PASSED TO SAID CRACKING ZONE.