Production of motor fuels from petroleum oils

Claim 1

IN THE PROCESS OF PRODUCING MOTOR FUELS FROM CRUDE PETROLEUM WHICH COMPRISES SUBJECTING CRUDE PETROLEUM TO DISTILLATION TO PRODUCE A HEAVY VIRGIN NAPTHA FRACTION BOILING BETWEEN ABOUT 200 AND 450* F. AND A GAS OIL FRACTION, SUBJECTING SAID GAS OIL FRACTION CATALYTIC CRACKING IN A CRACKING ZONE IN THE PRESENCE OF A DENSE TURBULENT FLUIDIZED MASS OF SUBDIVIDED CRACKING CATALYST AT MOTOR FUEL PRODUCING CONDITIONS, WITHDRAWING CATALYST FROM SAID MASS, REGENERATING SAID WITHDRAWN CATALYST IN A REGENERATION ZONE BY A COMBUSTION REACTION TO REMOVE CARBONACEOUS DEPOSITS AND REHEAT THE CATALYST, RETURNING HOT REGENERATED CATALYST FROM SAID REGENERATING ZONE TO SAID MASS, WITHDRAWING CRACKED PRODUCTS FROM SAID CRACKING ZONE, FRACTIONATING SAID CRACKED PRODUCTS IN A FRACTIONATION ZONE, WITHDRAWING FROM SAID FRACTIONATION ZONE AT FRACTION CONTAINING MOTOR FUELS AND A CYCLE OIL FRACTION BOILING ABOVE ABOUT 700* F., THE IMPROVEMENT WHICH CONSISTS OF COMBINING AT LEAST A MAJOR PORTION OF SAID CYCLE OIL FRACTION WITH AT LEAST A PORTION OF SAID HEAVY VIRGIN NAPHTHA FRACTION TO PRODUCE A MIXTURE CONTAINING ABOUT 20-80 VOL. PERCENT OF VIRGIN NAPHTHA, PASSING SAID MIXTURE SUBSTANTIALLY IN THE VAPOR PHASE THROUGH A NARROWLY CONFINED PATH AT TEMPERATURES OF ABOUT 1000*-1200* F., PRESSURES OF ABOUT 300-600 P.S.I.G. AND RESIDENCE TIMES CORRESPONDING TO THROUGHPUTS OF ABOUT 5-20 V./V./HR. IN THE PRESENCE OF FINELY DIVIDED CRACKING CATALYST SUSPENDED IN SAID MIXTURE IN A PROPORTION OF ABOUT 2 TO 30 POUNDS OF CATALYST PER LIQUID BARREL OF MIXED FED, WITHDRAWING REACTION PRODUCTS FROM SAID PATH AND RECOVERING MOTOR FUELS FROM SAID REACTION PRODUCTS.