Method of controlling the temperature in a fluidized catalyst regeneration process

Claim 1

A METHOD OF REGENERATING POWDERED CATALYTIC MATERIAL CONTAINING COMBUSTIBLE DEPOSITS WHICH COMPRISES THE SUSPENDING OF SAID CATALYST IN A GASEOUS STREAM CONTAINING OXYGEN IN AN AMOUNT SUFFICIENT TO BURN SAID DEPOSITS, PASSING THE RESULTANT CATALYST SUSPENSION THROUGH AN ELONGATED UNITARY REGENERATION ZONE MAINTAINED AT A TEMPERATURE SUFFICIENT TO BURN DEPOSITS, PASSING A COOLING MEDIUM IN INDIRECT HEAT EXCHANGE RELATION WITH THE CATALYST SUSPENSION IN THE REGENERATION ZONE AND IN A DIRECTION CONCURRENT TO THE FLOW OF SAID SUSPENSION TO REMOVE HEAT LIBERATED DURING SAID REGENERATION, POSITIVELY AND PROGRESSIVELY REDUCING THE RATE OF HEAT REMOVAL FROM THE SUSPENSION AS IT PROCEEDS THROUGH THE REGENERATION ZONE AND THE RATE OF BURNING OF THE SUSPENSION DECREASES BY PROGRESSIVELY WITHDRAWING COOLING MEDIUM THROUGHOUT THE LENGTH OF THE REGENERATION ZONE, THE AMOUNT OF COOLING MEDIUM SO WITHDRAWN BEING CONTROLLED TO PREVENT THE TEMPERATURE OF THE SUSPENSION BEING REDUCED, ITS PASSAGE THROUGH THE REGENERATION ZONE.