Combination catalytic crackinghydroprocessing operation

Claim 1

A PROCESS FOR THE EFFICIENT CONVERSION OF A HYDROCARBON CHARGE STOCK BOILING IN THE RANGE FROM ABOUT 650* F. TO ABOUT 1050*F. TO LOWER BOILING PRODUCTS WITH A MINIMUM BUILD-UP OF REFRACTORY COMPONENTS WHICH COMPRISES: (1) REACTING SAID HYDROCARBON CHARGE STOCK IN THE PRESENCE OF HYDROGEN UTILIZING REACTION CONDITIONS WHEREIN SAID REACTION RESULTS IN A NET COMSUMPTION OF HYDROGEN TO PRODUCE A HYDROPROCESSED PRODUCT; (2) SEPARATING THE PORTION OF THE HYDROPROCESSED PRODUCT BOILING ABOVE 380*F. FROM SAID HYDROPROCESSED PRODUCT INTO A LOWER BOILING FRACTION BOILING IN THE RANGE FROM ABOUT 380*F. TO ABOUT 650*F. AND A HIGHER BOILING FRACTION IN THE RANGE FROM ABOUT 650*F. TO ABOUT 900*F.; (3) CATALYTICALLY CRACKING SAID LOWER BOILING PORTION OF SAID HYDROPROCESSED PRODUCT TO A GASOLINE-CONTAINING PRODUCT, ALL OF WHICH IS REMOVED FROM THE SYSTEM; (4) A! CATALYTICALLY CRACKING SAID HIGHER BOILING HYDROPROCESSED FRACTION IN A SEPARATE CATALYTIC CRACKING ZONE TO LOWER BOILING GASOLINE-CONTAINING PRODUCTS; B! SEPARATING A CATALYTIC GAS OIL BOILING IN THE RANGE FROM ABOUT 400*F. TO ABOUT 650:F. FROM SAID GASOLINE-CONTAINING PRODUCT; C! RECYCYLING SAID CATALTIC GAS OIL TO THE HYDROPROCESSING STEP (1); AND D! PROCESSING SAID CATALYTIC GAS OIL THROUGH THE SEQUENCE OF STEPS (1), (2), (3), (4A), (4B) AND (4C).