Regenerating catalyst with tangential introduction and circumferential swirl in a fluidized bed

Claim 1

IN A HYDROCARBON CONVERSION-CATALYST REGENERATION OPERATION IN THE PRESENCE OF FLUIDIZABLE CATALYST PARTICLES, THE IMPROVED METHOD OF REGENERATING THE CATALYST WHICH COMPRISES, MAINTAINING A DENSE FLUID BED OF CATALYST PARTICLES CIRCULATING CIRCUMFERENTIALLY IN A CATALYST REGENERATION ZONE, INTRODUCING CATALYST PARTICLES OBTAINED FROM A HYDROCARBON CONVERSION OPERATION AFTER STRIPPING THEREOF INTO SAID REGENERATION ZONE TANGENTIALLY TO SAID CIRCULATING BED OF CATALYST IN A RESTRICTED ANNULAR SECTION EXPANDING IN THE DIRECTION OF CATALYST CIRCULATION, SAID ANNULAR SECTION FORMED BY A CURVED UPWARDLY EXTENDING BAFFLE SPACED INWARDLY FROM THE OUTER WALL OF THE REGENERATION ZONE, PASSING REGNERATION GAS UPWARDLY THROUGH SAID CIRCULATING FLUID BED OF CATALYST IN SAID REGENERATION ZONE RECOVERING GASEOUS PRODUCTS OF REGENERATION FROM AN UPPER PORTION OF THE REGENERATION ZONE, AND WITHDRAWING REGENERATED CATALYST FROM A LOWER SECTION OF SAID FLUID BED OF CATALYST UPSTREAM SAID TANGENTIALLY INTRODUCED CATALYST TO SAID CIRCULATING BED AND OUTSIDE OF SAID RESTRICTED ANNULAR SECTION.