Staged calcining of fluid coke with falling, non-fluid bed

Claim 1

A PSROCESS FOR DESULFURIZING, DEVOLATILIZING AND INCREASING THE DENSITY OF FLUID COKE PARTICLES WHICH COMPRISES THE STEPS OF FEEDING HEATED COKE PARTICLES TO AN UPPER PORTION OF A CLACINATION ZONE; MAINTAINING THE COKE PARTICLES THEREIN IN THE FORM OF A FALLING, NON-FLUID BED; COUNTERCURRENTLY CONTACTING THE COKE PARTICLES UNDER REDUCING CONDITIONS IN AN UPPER PORTION OF THE CALCINATION ZONE AT A TEMPERATURE IN THE RANGE OF 2000* TO 2700* F. WITH HYDROGEN EVOLVED IN THE LOWER PORTION OF THE CALCINATION ZONE, THE HYDROGEN VELOCITY BEING LESS THAN THAT REQUIRED TO FLUIDIZE THE COKE; COUNTERCURENTLY CONTACTING THE THUS TREATED COKE IN A LOWER PORTION OF THE CALCINATION ZONE AT A TEMPERATURE IN THE RANGE OF 1800* TO 2200* F. WITH A NORMALLY GASEOUS HYDROCARBON AT A VELOCITY LES THAN THAT REQUIRED TO FLUIDIZE THE COKE, THE HYDROCARBON BEING CRACKED TO HYDROGEN AND CARBON WHICH DEPOSITS ON STHE VOIDS OF THE FLUID COKE, SAID CRACKING COOLING THE COKE TO THE REQUIRED TEMPERATURE AND WITHDRAWING CALCINED FLUID COKE PRODUCT FROM THE LOWER PORTION OF THE CALCINATION ZONE, THE TOTAL TREATING TIME IN THE CIRCINATION ZONE BEING IN THE RANGE OF 30 MINUTES TO 6 HOURS.