Controlling catalyst regeneration temperature

Claim 1

IN A PROCESS FOR REGENERATING CONTAMINATED CATALYST PARTICLES WHEREIN SAID PARTICLES AND A REGENERATING GAS ARE PASSED UPWARDLY INTO A REGENERATING ZONE, CARBONACEOUS DEPOSITS ON SAID CATALYST ARE REMOVED BY COMBUSTION WITHIN SAID REGENERATING ZONE, AND REGENERATED CATALYST PARTICLES ARE WITHDRAWN FROM SAID REGENERATING ZONE, THE METHOD OF CONTROLLING THE TEMPERATURE OF SAID COMBUSTION WHICH COMPRISES WITHDRAWING AN ANNULAR STREAM OF CATALYST PARTICLES DOWNWARDLY FROM SAID ZONE AND COOLING SAID STREAM DURING THE DOWNWARD PASSAGE THEREOF BY INDIRECT HEAT EXCHANGE WITH A COOLING FLUID, COMMINGLING SAID STREAM WITH AN UPWARDLY FLOWING COOLING GAS AND PASSING THE RESULTANT MIXTURE UPWARDLY IN A PLURALITY OF STREAMS THROUGH THE CENTRAL SPACE DEFINED BY SAID DOWNFLOWING ANNULAR STREAM, COOLING SAID PLURALITY OF STREAMS DURING THE UPWARD PASSAGE THEREOF BY INDIRECT HEAT EXCHANGE WITH SAID FIRST NAMED COOLING FLUID, AND DISCHARGING THE RESULTANT COOLED MIXTURE INTO SAID REGENERATING ZONE.