Conversion of heavy oils to gasoline using the fluidized catalyst technique

Claim 1

PROCESS FOR THE CATALYTIC CRACKING OF HYDROCARBON OILS WHICH COMPRISES CONTINUOUSLY WITHDRAWING A FINELY DIVIDED CRACKING CATALYST PASSING ESSENTIALLY A 100 MESH U.S. STANDARD SIEVE AT A TEMPERATURE BETWEEN ABOUT 1100 AND 1200*F. FROM A FIRST FLUIDIZED CATALYST BED UNDERGOING REGENERATION, CONTACTING SAID CATALYST WITH OIL TO BE CRACKED AT A TEMPERATURE BETWEEN ABOUT 900 AND 1000*F. WHEREBY CRACKING IS EFFECTED, COLLECTING THE THUS USED CATALYST IN A SECOND FLUIDIZED BED, WITHDRAWING A STREAM OF CATALYST BY GRAVITY FLOW FROM SAID SECOND FLUIDIZED BED, ALSO WITHDRAWING FROM THE BOTTOM OF SAID FIRST FLUIDIZED BED A CONTINUOUS STREAM CONSISTING ESSENTIALLY OF INERT, NON-ABSORBENT, SOLID CERAMIC PARTICLES ESSENTIALLY WITHIN THE RANGE OF ABOUT 60 TO 3.5 MESH AT A TEMPERATURE BETWEEN ABOUT 1100 AND 1200*F. AND HAVING A SETTLING VELOCITY SUBSTANTIALLY HIGHER THAN SAID CATALYST, MIXING THE SAID STREAM OF CATALYST WITHIN 5 SECONDS OF ITS WITHDRAWAL WITH SAID STREAM OF PARTICLES IN A NARROW RISER ZONE, TRANSPORTING THE RESULTING MIXTURE WITH STEAM UP THROUGH SAID NARROW RISER ZONE TO A DISENGAGING ZONE, COLLECTING THE MIXTURE OF SOLIDS AS A FLUIDIZED BED IN SAID DISENGAGING ZONE, AND CONTINUOUSLY PASSING THE SAID COLLECTED SOLIDS FROM SAID DISENGAGING ZONE TO SAID FIRST FLUIDIZED BED UNDERGOING REGENERATION WHEREBY THE SAID PARTICLES OF INERT SOLIDS SINK TO THE BOTTOM OF SAID FLUIDIZED BED AND SAID DISENGAGING ZONE.