Process of catalytic desulfurization and hydrocracking of hydrocarbons followed by catalytic cracking

Claim 1

A PROCESS FOR OBTAINING INCREASED YIELDS OF GASOLINE FROM CRUDE PETROLEUM CONTAINING SULFUR AND ORGANO-METALLIC COMPOUNDS WHICH COMPRISES FRACTIONALLY DISTILLING SAID CRUDE PETROLEUM TO OBTAIN A GAS FRACTION, A GASOLINE FRACTION, A LIGHT GAS OIL FRACTION, A HEAVY GAS OIL FRACTION CONTAINING LESS THAN 4 PARTS PER MILLION OF METALS CONTAINED IN ORGANIC-METALLIC COMPOUNDS, AND A RESIDUUM CONTAINING MORE THAN 5 PARTS PER MILLION OF METALS CONTAINED IN ORGANO-METALLIC COMPOUNDS, PASSING SAID HEAVY GAS OIL FRACTION TO A CATALYTIC CRACKING ZONE AND CONTACTING IT WITH A CRACKING CATALYST UNDER CRACKING CONDITIONS, PASSING SAID RESIDUUM INTO A VACUUM FLASHING ZONE AND THERE SUBJECTING SAID RESIDUUM TO FLASH DISTILLATION UNDER SUBATMOSPHERIC PRESSURE, REMOVING FROM SAID FLASH DISTILLATION ZONE A HEAVY BOTTOMS FRACTION AND AN OVERHEAD FRACTION COMPOSED ESSENTIALLY OF HYDROCARBONS BOILING IN THE GAS OIL RANGE AND CONTAINING FROM ABOUT 5 TO 50 PARTS PER MILLION OF METAL, CONTAINED IN ORGANO-METALLIC COMPOUNDS, PASSING SAID OVERHEAD FRACTION INTO A HYDROCRACKING ZONE AND REACTING IT WITH HYDROGEN IN THE PRESENCE OF A SULFUR-RESISTANT HYDROGENATION CATALYST AT A TEMPERATURE IN THE RANGE ABOUT 800 TO 900*F., A PRESSURE OF FROM 300 TO 1500 P.S.I.G., AND A SPACE VELOCITY IN THE RANGE ABOUT 0.8 TO 5.0 V./V./HR., FRACTIONALLY DISTILLING THE EFFLUENT FROM THE HYDROCRACKING ZONE CONTAINING LESS THAN 4 PARTS PER MILLION OF METALS TO SEPARATE A FRACTION COMPRISING GASOLINE AND A HIGHER BOILING FRACTION, CONTACTING SAID HIGHER BOILING FRACTION WITH A CRACKING CATALYST IN A CRACKING ZONE UNDER CRACKING CONDITIONS, AND RECOVERING A GASOLINE FRACTION FROM THE EFFLUENT OF THE CRACKING ZONE.