Hydrocracking of hydrocarbons with the constant addition of sulfur to the reaction zone

Claim 1

A SINGLE-STAGE HYDROCRACKING PROCESS FOR THE CONVERSION OF A HYDROCARBON LIQUID FRACTION INTO LIGHTER HYDROCARBONS WHICH COMPRISES CONTACTING IN A SINGLE HYDROCRACKING STAGE A SULFUR-CONTAINING HYDROCARBON FRACTION HAVING AN INITIAL BOILING POINT NOT LESS THAN ABOUT 400*F. IN THE PRESENCE OF HYDROGEN UNDER HYDROCRACKING CONDITIONS WITH A HYDROCRACKING CATALYST COMPRISING A HYDROGENATING COMPONENT SELECTED FROM THE GROUP CONSISTING OF (1) NICKEL AND TUNGSTEN (2) THEIR OXIDES AND (3) MIXTURES THEREOF, RECOVERING FROM THE REACTION PRODUCT A MOTOR FUEL FRACTION HAVING AN END POINT OF ABOUT 400*F., RECYCLING TO THE HYDROCRACKING ZONE A REACTION PRODUCT FRACTION BOILING ABOVE THE MOTOR FUEL RANGE UNTIL AT LEAST 60% OF THE HYDROGENATION COMPONENTS OF THE CATALYSTS ARE SULFIDED, RECOVERING AS PRODUCT FROM THE HYDROCRACKING REACTION A MOTOR FUEL FRACTION AND A JET FUEL FRACTION, AND RECYCLING TO THE HYDROCRACKING ZONE THAT PORTION OF THE PORDUCT BOILING ABOVE THE JET FUEL RANGE, THE AMOUNT OF SULFUR INTRODUCED INTO THE HYDROCRACKING ZONE BEING MAINTAINED SUBSTANTIALLY CONSTANT THROUGHOUT THE PROCESS.