Process for cracking a plurality of hydrocarbon oils in a suspension of catalyst particles in a riser reactor

Claim 1

IN THE CRACKING OF A PLURALITY OF PETROLEUM HYDROCARBON CHARGE STOCKS IN THE PRESENCE OF A FINELY DIVIDED SOLID CATALYST UNDER FLW CONDITIONS PROVIDING PROGRESSIVE REACTION, THE METHOD WHICH COMPRISES VAPRIZING A VIRGIN GAS OIL TO BE CONVERTED, SAID GAS OIL CONTAINING RELATIVELY LOW PROPORTIONS OF COKE-FORMING CONSTITUENTS, MIXING SAID VAPORS WITH THE FINELY DIVIDED CATALYST TO FORM A SUSPENSION HAVING A DENSITY OF ABOUT 5 TO 10 POUNDS PER CUBIC FOOT, FLOWING THE SUSPENSION INITIALLY AT A LINEAR VELOCITY EXCEEDING ABOUT 12 TO 15 FEET PER SECOND UPWARDLY THROUGH AN ELONGATED, VERTICALLY EXTENDING CONFINED REACTION FLOW PATH TO CRACK SAID VIRGIN GAS OIL, AND INTRODUCING INTO THE REACTION NOW PATH A RECYCLE STOCK CONTAINING RELATIVELY HIGH PROPORTIONS OF COKE-FORMING