Fluidized catalyst regeneration process

Claim 1

A PROCESS FOR THE REGENERATION OF A ZEOLITE-CONTAINING OR AN AMORPHOUS COKE-CONTAMINATED SPENT HYDROCARBON CRACKING CATALYST, REMOVED FROM A REACTION ZONE, AND THE CONVERSION OF CARBON MONOXIDE, RESULTING FROM THE OXIDATION OF COKE FROM SAID CATALYST, TO CARBON DIOXIDE, WHEREIN THE RESIDUAL COKE ON THE REGENERATED CATALYST IS DIRECTLY CONTROLLABLE WHICH PROCESS IS OPERATED WITHIN A PRESSURE RANGE FROM ABOUT NORMAL ATMOSPHERIC TO ABOUT 50 PSIG. AND COMPRISES THE STEPS OF: A. PASSING SAID CATALYST AND A FRESH FREE OXYGEN-CONTAINING REGENERATION GAS IN A CONTROLLED AMOUNT TO A FIRST DENSE BED OF FLUIDIZED PARTICULATE CATALYST IN A REGENERATION ZONE AND OXIDIZING COKE IN SAID FIRST DENSE BED MAINTAINED AT OXIDIZING CONDITIONS INCLUDING A TEMPERATURE WITHIN THE RANGE OF ABOUT 1250*F., TO ABOUT 1400*F A SUPERFICIAL GAS VELOCITY WITHIN THE RANGE OF ABOUT 3 TO ABOUT 10 FEET PER SECOND, AND A CATALYST RESIDENCE TIME OF LESS THAN TWO MINUTES, B. CONTROLLING THE AMOUNT OF FRESH FREE OXYGEN-CONTAINING REGENERATION GAS OF STEP (A) PASSED INTO SAID DENSE BED TO OXIDIZE SAID COKE TO A PREDETERMINED RESIDUAL COKE LEVEL TO PRODUCE REGENERATED CATALYST HAVING A DESIRED RESIDUAL COKE LEVEL AND PARTIALLY SPENT REGENERATING GAS CONTAINING CO, C. PASSING SAID REGENERATED CATALYST AND PARTIALLY SPENT REGENERATION GAS TO A DILUTE PHASE TRANSPORT RISER COMMUNICATING WITH AND SUPERIMPOSED OVER SAID FIRST DENSE BED AND THEREIN ESSENTIALLY COMPLETELY CONVERTING CO TO CO2 AT CONVERSION CONDITIONS INCLUDING A TEMPERATURE WITHIN THE RANGE OF ABOUT 1275*F. TO 1475*F., A SUPERFICIAL GAS VELOCITY WITHIN THE RANGE OF ABOUT 10 TO 25 FEET PER SECOND, AND A RESIDENCE TIME WHICH PRECLUDES FURTHER SUBSTANTIAL OXIDATION OF RESIDUAL COKE AND ADDITIONAL PRODUCTION OF CO, TO PRODUCE SPENT REGENERATION GAS, D. SEPARATING THE THUS-REGENERATED CATALYST FROM SAID SPENT REGENERATION GAS, AND,