Production of high quality gasoline and diesel fuel by hydrocaracking a refractory cycle oil

Claim 1

A PROCESS FOR HYDROCRACKING REFRACTORY CYCLE STOCKS WHICH HAVE BEEN PRODUCED IN CONVENTIONAL CATALYTIC CRACKING AND WHICH CONTAIN AT LEAST ONE PERCENT, BY WEIGHT, SULFUR TO PRODUCE DIRECTLY A NAPHTHA HAVING A LEADED (3ML.) OCTANE RATING OF AT LEAST 95 WITHOUT REFORMING AND A DIESEL FUEL HAVING A CETANE INDEX OF AT LEAST 35, WHICH COMPRISES: CONTACTING SAID REFRACTORY CYCLE STOCK FROM CONVENTIONAL CATALYTIC CRACKING WHICH AS A SUSLFUR CONTENT OF AT LEAST ONE PERCENT, BY WEIGHT, AN INITIAL BOILING POINT WITHIN THE RANGE ABOUT 300*F. TO 500*F. AND AN END BOILING POINT WITHIN THE RANGE ABOUT 600*F. TO 900*F., WITH A CATALYST WHICH INCLUDES 0.05 PERCENT TO 20 PERCENT, BY WEIGHT, OF THE CATALYST, OF AT LEAST ONE METAL SELECTED FROM THE GROUP CONSISTING OF METALS HAVING ATOMIC NUMBERS OF 44 TO 46, INCLUSIVE, AND 76 TO 78, INCLUSIVE, DEPOSITED UPON A SYNTHETIC COMPOSITE OF THE SOLID OXIDES OF AT LEAST TWO ELEMENTS OF GROUPS IIA, IIIB AND IV OF THE PERIODIC ARRANGEMENT OF THE ELEMENTS, SAID COMPOSITE HAVING AN ACTIVITY INDEX OF AT LEAST 25, IN THE PRESENCE OF HYDROGEN IN AMOUNTS EXPRESSED AS THE MOLAR RATIO OF HYDROGEN TO HYDROCARBON CHARGE, WITHIN THE RANGE ABOUT 10 TO ABOUT 40, AT A LIQUID HOURLY SPACE VELOCITY WITHIN THE RANGE ABOUT 0.25 TO ABOUT 5, UNDER A HYDROGEN PRESSURE WITHIN THE RANGE ABOUT 500 TO ABOUT 3000 P.S.I.G. AND AT A TEMPERATURE WITHIN THE RANGE ABOUT 600*F. TO ABOUT 900*F., AND CORRELATING SAID TEMPERATURE AND SPACE VELOCITY TO MAINTAIN THE AMOUNT OF CONVERSION TO PRODUCTS BOILING BELOW 410*F. WITHIN THE RANGE ABOUT 5 TO 25 VOLUME PERCENT.