Prevention of disperse phase coking in fluid coking apparatus

Claim 1

APPARATUS FOR CRACKING HIGHER BOILING HYDROCARBONS TO LOWER BOILING HYDROCARBONS WHICH INCLUDES A VERTICALLY ARRANGED REACTION VESSEL ADAPTED TO CONTAIN A FLUIDIZED BED OF SOLIDS IN ITS LOWER PORTION WITH A DISPERSE SOLIDS PHASE IN ITS UPPER PORTION, MEANS FOR INTRODUCING OIL TO BE CRACKED INTO THE FLUIDIZED BED OF SOLIDS IN SAID VESSEL, CYCLONE SEPARATING MEANS IN THE UPPER PORTION OF SAID VESSEL, AND PROVIDED WITH A VAPOR REMOVAL LINE, AN OPEN OVERFLOW POT IN THE UPPER PORTION OF SAID VESSEL, A CONDUIT FOR SUPPLYING FRESHLY REHEATED SOLIDS TO SAID OVERFLOW POT FROM WHICH THE SOLIDS OVERFLOW INTO THE FLUIDIZED BED IN SAID VESSEL, A VERTICALLY ARRANGED INTERNAL OPEN ENDED PIPE HAVING ITS LOWER END PROJECTING INTO SAID OVERFLOW POT AND ADAPTED TO BE SUBMERGED BELOW THE FRESHLY REHEATED SOLIDS THEREIN AND HAVING ITS UPPER OPEN END IN THE REGION OF THE INLET TO SAID CYCLONE SEPARATING MEANS, MEANS FOR INTRODUCING A LIFT GAS INTO THE LOWER PORTION OF SAID INTERNAL PIPE TO TRANSFER FRESHLY REHEATED SOLIDS FROM SAID OVERFLOW POT TO THE UPPER PORTION OF SIAD VESSEL DIRECTLY TO THE VICINITY OF THE INLET