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Claim 1

IN A PROCESS FOR CONVERTING A CRUDE HYDROCARBON FEED HAVING AN END POINT ABOVE 950*F. TO LOWER BOILING VALUABLE LIQUID PRODUCTS WHICH CONPRISES SEPARATING SAID CRUDE HYDROCARBON FEED INTO FRACTIONS INCLUDING AT LEAST ONE NAPTHA FRACTION AND AT LEAST ONE RESIDUUM FRACTION SUBSTANTIALLY BOILING ABOVE 750*F., TREATING SAID RESIDUUM FRACTION IN A COKING ZONE TO PRODUCE COKE AND A LIQUID COKER DISTILLATE, AND CONTACTING AT LEAST A PORTION OF SAID LIQUID COKER DISTILLATE IN A HYDROCRACKING ZONE IN THE PRESENCE OF HYDROGEN AND A HYDROCRACKING CATALYST UNDER HYDROCRACKING CONDITIONS, THE IMPROVEMENT WHEREIN SAID COKING ZONE IS A DELAYED COKER COMPRISING A COKING FURNACE OPERATED AT LOW PRESSURE, AND AT LEAST ONE COKE DRUM, AND WHEREIN SAID RESIDUUM IS TREATED BY SEPARATING IT INTO A FRACTION BOILING IN THE RANGE OF ABOUT 750* TO 950*F. AND A FRACTION BOILING ABOVE ABOUT 950*F., PASSING SAID FRACTION BOILING FROM ABOUT 750* TO 950*F. TO A THERMAL CRACKING FURNACE OPERATED AT A PRESSURE OF 300 TO 1000 P.S.I.G., PASSING THE EFFLUENT FROM SAID THERMAL CRACKING FURNACE THROUGH A PRESSURE REDUCTION ZONE TO REDUCE THE PRESSURE THEREON FROM 300 TO 1000 P.S.I.G. TO A LOW PRESSURE BELOW 300 P.S.I.G., PASSING SAID EFFLUENT UNDER SAID REDUCED PRESSURE TO SAID COKE DRUM, PASSING SAID FRACTION BOILING ABOVE ABOUT 950*F. TO SAID COKING FURNACE, PASSING THE EFFLUENT FROM SAID COKING FURNACE TO SAID COKE DRUM, AND PASSING TO SAID HYDROCRACKING ZONE AT LEAST A PORTION OF THE LIQUID COKER DISTILLATE FROM SAID COKE DRUM HAVING AN END POINT BELOW ABOUT 750*F.