Fluid catalyst regeneration process

Claim 1

A process for regenerating a coke contaminated fluid catalyst, said process including the steps of: (a) introducing oxygen containing regeneration gas, coke contaminated fluid catalyst, and cool recycled regenerated catalyst from a source hereinafter described, into a lower locus of a dilute phase combustion zone maintained at a temperature sufficient for coke oxidation and therein oxidizing coke to product hot regenerated catalyst and hot flue gas; (b) transporting said hot flue gas and said hot regenerated catalyst from an upper locus of said combustion zone into a regenerated catalyst disengaging zone, wherein said hot regenerated catalyst is separated from said flue gas; (c) transporting a portion of said hot regenerated catalyst from said disengaging zone to the upper locus of a cooling zone separate from said disengaging zone wherein said cooling zone said hot regenerated catalyst is passed downwardly and heat is withdrawn from said hot regenerated catalyst by indirect heat exchange with a cooling fluid enclosed in a heat exchange means inserted into said cooling zone to produce cool regenerated catalyst, said catalyst being maintained in said cooling zone as a dense phase fluidized bed by passing a fluidizing gas upwardly through such bed, the quantity of heat withdrawal from said catalyst in said cooling zone being controllably maintained by controlling the quantity of said fluidizing gas into said cooling zone, whereby the heat transfer coefficient between said heat exchange means and said fluidized bed and thus the quantity of heat transferred is controlled; and (d) withdrawing said cool regenerated catalyst from a lower locus of said cooling zone and transporting said catalyst to said lower locus of said combustion zone as said cool recycled regenerated catalyst.