Liquid phase - boo

Claim 1

IN A COMBINATION HYDROCARBON OIL FLUID COKING PROCESS WHEREIN AN OIL IS INITIALLY SUBJECTED TO RELATIVELY MILD LONG TIME CONVERSION CONDITIONS AT A TEMPERATURE IN THE RANGE OF 800* TO 900*F. IN A LIQUID PHASE DELAYED COKING ZONE TO CAUSE SUBSTANTIAL CONVERSION TO VAPORS AND VAPORIZABLE LIQUID, AND THEN THE UNCONVERTED LIQUID RESIDUE OF SAID OIL AND SAID VAPORIZABLE LIQUID ARE PASSED TO THE FLUID COKING ZONE OF A TWO-VESSEL HYDROCARBON OIL FLUIDIZED SOLIDS COKING SYSTEM COMPRISING A FLUID COKING ZONE AND A HEATING ZONE TO BE FURTHER COMPLETELY CONVERTED TO COKE AND VAPORS; THE IMPROVEMENT WHICH COMPRISES PASSING PREHEATED SHOT OF RELATIVELY LARGE PARTICLE SIZE DOWNWARDLY THROUGH SAID LIQUID PHASE DELAYED COKING ZONE TO SUPPLY A MAJOR PORTION OF THE NECESSARY HEAT THERETO AND TO REMOVE COKE PRECURSORS THEREFROM, PASSING SAID SHOT ALONG WITH THE VAPORIZABLE LIQUID AND UNCONVERTED LIQUID RESIDUE TO SAID FLUID COKING ZONE WHEREBY SAID SHOT IS DRIED, THEN FLOWING SAID SHOT TO SAID HEATING ZONE ALONG WITH THE PORTION OF THE FLUIDIZED SOLIDS TRANSFERRED FROM SAID FLUID COKING ZONE TO SAID HEATING ZONE TO BE REHEATED THEREIN, AND SEPARATING AND RETURNING SAID SHOT SO REHEATED TO SAID DELAYED COKING ZONE.