Low pressure hydrocracking process with hydrofining of feed

Claim 1

AN IMPROVED, LOW-PRESSURE PROCESSES FOR HYDROCRACKING A MINERAL OIL FEEDSTOCK BOILING ABOVE THE GASOLINE RANGE AND CONTAINING ORGANIC NITROGEN COMPOUNDS, WHICH COMPRISES FIRST SUBJECTING SAID FEEDSTOCK TO CATALYTIC HYDROFINING UNDER SUBSTANTIALLY NON-CRACKING CONDITIONS IN THE PRESENCE OF ADDED HYDROGEN AND A HYDROFINING CATALYST COMPRISING A HYDROGENTING COMPONENET FROM THE CLASS CONSISTING OF THE OXIDES AND SULFIDES OF MOLYBDENUM, TUNGSTEN AND THE GROUP VIII METALS SUPPORTED ON A SUBSTANTIALLY NON-CRACKING INORGANIC OXIDE CARRIER, AND UNDER HYDROFINING CONDITIONS ADJUSTED TO GIVE A SUBSTANTIAL DECOMPOSITION OF SAID ORGANIC NITROGEN COMPOUNDS WITH RESULTANT FORMATION OF AMMONIA, SUBJECTING EFFLUENT FROM SAID HYDROFINING STEP, WITHOUT INTERVENING PURIFICATION TO REMOVE AMMONIA, TO A FIRST STAGE OF HYDROCRACKING AT A SPACE VELOCITY BETWEEN ABOUT 0.5 AND 10 IN THE PRESENCE OF A HYDROCRACKING CATALYST COMPRISING A SOLID REFRACTORY CRACKING BASE AND A GROUP VIII METAL SULFIDE HYDROGENATING COMPONENT, TREATING MIXED EFFLUENT FROM SAID FIRST STAGE OF HYDROCRACKING AND THE EFFLUENT FROM THE HEREINAFTER DEFINED SECOND STAGE OF HYDROCRACKING TO SEPARATE AMMONIA AND LOW-BOILING HYDROCARBONS THEREFROM , SUBJECTING REMAINING OIL BOILING ABOVE THE GASOLINE RANGE TO A SECOND STAGE OF HYDROCRACKING IN THE PRESENCE OF HYDROGEN AND A FIXED BED OF HYDROCRACKING CATALYST COMPRISING A SOLID REFRACTORY CRACKING BASE AND A GROUP VIII METAL HYDROGENATING COMPONENT, AND COMBINING THE EFFLUENT FROM SAID SECOND STAGE OF HYDROCRACKING WITH SAID FIRSTSTAGE HYDROCRACKING EFFLUENT TO FORM SAID MIXED EFFLUENT, EACH OF SAID HYDROFINING AND HYDROCRACKING STEPS BEING CARRIED OUT AT PRESSURES BETWEEN ABOUT 400-2,000 P.S.I.G., AND TEMPERATURES BETWEEN ABOUT 450* AND 875*F.