Hydrocracking heavy hydrocarbons to gasoline and distillate

Claim 1

A PROCESS FOR HYDROCRACKING A HIGH MOLECULAR WEIGHT PETROLEUM FEED STOCK CONTAINING A MINOR CONCENTRATION BUT NOT MORE THAN 15 P.P.M. OF NITROGEN TO PRODUCE DISTILLATE AND GASOLINE WHICH COMPRISE THE STEPS OF: (A) CONTACTING SAID STOCK, CONTAINING SAID MINOR CONCENTRATION OF NITROGEN, IN A REACTOR IN ADMIXTURE WITH HYDROGEN WITH A HYDROCRACKING CATALYST ON A POROUS SUPPORT SELECTED FROM THE GROUP CONSISTING OF ALUMINA, SILICA-ALUMINA, AND ALUMINUM SILICATE CONTAINING 0.1 TO 15 WEIGHT PERCENT HALOGEN UNDER HYDROCRACKING CONDITIONS; (B) FEEDING STEAM TO SAID REACTOR IN AN AMOUNT IN THE RANGE 0 TO 3 WEIGHT PERCENT OF THE PETROLEUM FEED; (C) FEEDING A HALOGEN SUPPLYING AGENT TO SAID REACTOR IN AN AMOUNT IN THE RANGE OF 0.1 TO 3 WEIGHT PERCENT OF SAID FEED; (D) MAINTAINING HYDROCRACKING CONDITIONS IN SAID REACTOR TO EFFECT FROM 15 TO 80 PERCENT CONVERSION OF SAID FEED, THE PRODUCTION OF GASOLINE IN C5 TO 400* F. BOILING RANGE BEING HIGHER AT HIGHER CONVERSIONS AND THE PRODUCTION OF DISTILLATE BEING HIGHER AT LOWER CONVERSION IN SAID RANGE; (E) DURING ONE PERIOD, CONTROLLING THE PROPORTIONS OF PRODUCED GASOLINE AND DISTILLATE BY INCREASING THE HALOGEN ADDITION RATE AND DECREASING THE STEAM ADDITION RATE WITHIN SAID RANGES TO INCREASE GASOLINE PRODUCTION; AND (F) DURING ANOTHER PERIOD INCREASING THE STEAM ADDITION RATE AND DECREASING THE HALOGEN ADDITION RATE WITHIN SAID RANGES TO INCREASE DISTILLATE PRODUCTION.