Process for the simultaneous desulfurization and coking of a residual petroleum fraction

Claim 1

A CONTINUOUS PROCESS FOR SIMULTANEOUSLY COKING AND DESULFURIZING HYDROCARBON RESIDUAL OILS HAVING A HIGH SULFUR CONTENT IN THE PRESENCE OF A MOVING GRAVITY PACKED BED OF HEATED COKE PARTICLES WHICH COMPRISES: MIXING ALUMINUM HYDRATE AS A DESULFURIZING AGENT WITH A STREAM OF LIQUID HYDROCARBON RESIDUAL OILS TO BE DESULFURIZED AND COKED, HEATING SAID STREAM OF LIQUID HYDROCARBON RESIDUAL OILS INCLUDING SAID DESULFURIZING AGENT TO A TEMPERATURE OF FROM ABOUT 700 TO 900*F., INTRODUCTING SAID HEAT STREAM OF LIQUID HYDROCARBON RESIDUAL OILS AND DESULFURIZING AGENT INTO A MOVING GRAVITY PACKED COLUMN OF RELATIVELY HOT COKE PARTICLES WHEREBY THE PARTICLES OF SAID COLUMN ARE SUBSTANTIALLY UNIFORMLY COATED WITH SAID DESULFURIZING AGENT AND SAID LIQUID HYDROCARBON RESIDUAL OILS, SAID COKE PARTICLES IN SAID COLUMN BEING HEATED TO A TEMPERATURE OF FROM ABOUT 850 TO 1100*F., PASSING THE COATED COKE PARTICLES OF SAID COLUMN AS A GRAVITY PACKED BED DOWNWARDLY THROUGH A CONVERSION ZONE WITHOUT THE INTRODUCTION OF HYDROGEN THERETO, MAINTAINING SAID COATED COKE PARTICLES IN THE CONVERSION ZONE AT THE COKING TEMPERATURES ESTABLISHED BY SAID HEATED PARTICLES AND AT A PRESSURE OF FROM 2 TO 60 P.S.I.G FOR A PERIOD SUFFICIENT TO COKE SAID LIQUID HYDROCARBON RESIDUAL OILS THEREBY TO FORM LIGHT HYDROCARBON VAPORS AND A DRY COKE DEPOSIT ON SAID PARTICLES, AND TO DESULFURIZE SAID LIQUID HYDROCARBON RESIDUAL OILS BY CONVERTING SULFUR THEREIN TO HYDROGEN SULFIDE, WITHDRAWING COKE PARTICLES HAVING A SUBSTANTIALLY DRY COKE AND SPENT ALUMINUM HYDRATE DEPOSITE THEREON FROM THE LOWER PORTION OF SAID CONVERSION ZONE, A PORTION OF SAID WITHDRAWN COKE PARTICLES CONSTITUTING PRODUCT COKE AND THE REMAINING PORTION OF SAID WITHDRAWN COKE PARTICLES BEING REHEATED AND RETURNED TO SAID MOVING GRAVITY PACKED COLUMN, AND REMOVING SAID LIGHT HYDROCARBON VAPORS AND SAID HYDROGEN SULFIDE FROM THE UPPER PORTION OF SAID CONVERSION ZONE.