Production of jet fuel hydrocarbons

Claim 1

THE METHOD OF PRODUCING JET FUEL HYDROCARBONS BOILING IN THE RANGE OF ABOUT 250* TO 550*F. WHICH COMPRISES, SUBJECTING A CATALYTIC CYCLE STOCK BOILING FROM ABOUT 439 TO 629*F. TO A FIRST-STAGE CATALYTIC REACTION IN THE PRESENCE OF HYDROGEN AT TEMPERATURES BETWEEN ABOUT 800* AND 875*F., CONTROLLING THE SPACE VELOCITY IN SAID FIRST-STAGE REACTION TO WITHIN VALUES OF BETWEEN ABOUT 3.0 AND 10.0 TO PROMOTE SELECTIVE CRACKING, IMMEDIATELY TRANSFERRING THE PRODUCTS FROM SAID FIRST-STAGE TO A SECOND-STAGE CATALYTIC REACTION IN THE PRESENCE OF HYDROGEN AT TEMPERATURES BETWEEN ABOUT 675* AND 725*F. AND LIQUID VOLUME HOURLY SPACE VELOCITIES OF FROM ABOUT 0.5 TO 3.0 TO PROMOTE HYDROGENATION, CONTROLLING THE HYDROGEN/HYDROCARBON MOL RATIOS IN BOTH REACTION STAGES TO WITHIN ABOUT 2.0 TO 10.0, THE CATALYST PRESENT IN BOTH STAGES BEING A COMPOSITE CATALYST CONSISTING OF AN ACIDICTYPE SILICA-ALUMINA CRACKING CATALYST PROMOTED WITH NICKEL AND A METEL SELECTED FROM THE GROUP CONSISTING OF COBALT AND TUNGSTEN, THE TOTAL AMOUNT OF METAL PROMOTER BEING 4 TO 15% BY WEIGHT OF THE CATALYST AND THE AMOUNT OF NICKEL PRESENT IN THE CATALYST BEING FROM 0.5 TO 5% BY WEIGHT, AND SEPARATING FORM THE PRODUCTS OF SAID SECOND STAGE A FRACTION BOILING FROM ABOUT 250* TO 550* F. WHICH QUALIFIES AS A JET FUEL.