Process for producing gasoline from a cracked feed stock by catalytic hydrocracking

Claim 1

A PROCESS FOR PRODUCING GASOLINE FROM CRACKED PETROLEUM STOCKS HAVING INITIAL BOILIN G POINTS ABOVE ABOUT 325*F. AND END POINTS BELOW ABOUT 900*F., WHICH COMPRISES CONTACTING SAID STOCKS IN AN ISOMERIZATIONCRACKING ZONE, IN THE PRESENCE OF FROM ABOUT 1,500 TO 30,000 S.C.F. H2 PER BARREL OF TOTAL FEED TO SAID ZONE, WITH A CATALYST COMPRISING A HYDROGENATING-DEHYDROGENATING COMPONENT SELECTED FROM THE GROUP CONSISTING OF (A) ABOUT 1 TO 12% MOLYBDENUM OXIDE, (B) A MIXTURE OF FROM ABOUT 1 TO 12% MOLYBDENUM OXIDE AND FROM ABOUT 0.1 TO 10% COBALT OXIDE, (C) MIXTURES OF FROM ABOUT 0.5 TO 10% EACH OF COBALT OXIDE AND CHROMIUM OXIDE, (D) ABOUT 0.1 TO 10% NICKEL METAL, (E) ABOUT 0.1 TO 10 NICKEL OXIDE, (F) ABOUT 0.1 TO 10% NICKEL SULFIDE, (G) ABOUT 0.1 TO 10% COBALT METAL, (H) ABOUT 0.1 TO 10% COBALT OXIDE, (I) ABOUT 0.1 TO 10% COBALT SULFIDE, (J) MIXTURES OF FROM ABOUT 0.1 TO 10% EACH OF NICKEL METAL AND COBALE METAL, (K) MIXTURES OF FROM ABOUT 0.1 TO 10% EACH OF NICKEL OXIDE AND COBALT OXIDE, AND (L) MIXTURES OF FROM ABOUT 0.1 TO 10% EACH OF NICKEL SULFIDE AND COBALT SULFIDE, SAID CATALYST FURTHER COMPRISING AN ACTIVE CRACKING SUPPORT COMPRISING SILICAALUMINA HAVING A SILICA CONTENT OF ABOUT 7O TO 99% AT A TEMPERATURE OF FROM ABOUT 500* TO 800*F., A PRESSURE OF AT LEAST 500 P.S.I.G., AND AN LHSV OF FROM 0.2 TO 15; RECOVERING FROM THE EFFLUENT OF SAID ZONE A HYDROGEN-RICH GASEOUS FRACTION, A REMAINING NORMALLY GASEOUS FRACTION, AT LEAST ONE GASOLINE FRACTION, AN INTERMEDIATE FRACTION HAVING AN INITIAL BOILING POINT ABOVE ABOUT 325*F. AND AN END POINT BELOW ABOUT 500*F., AND A BOTTOMS FROCTION BOILING ABOVE SAID INTERMEDIATE FRACTION; RETURNING TO THE ISOMERIZATION-CRACKING ZONE THE HYDROGEN-RICH FRACTION AND AT LEAST A PORTION OF THE INTERMEDIATE FRACTION RECOVERED THEREFROM; PASSING TO A CATALYTIC CRACKING ZONE AT LEAST A PORTION OF SAID BOTTOMS FRACTION RECOVERED THEREFROM.