Patent ID: 6503460
Filing Date: 2003-01-07
Classification: C10G

Abstract:
A catalyst regenerator for removing carbon from spent fluid catalytic cracking (FCC) catalyst circulated in an FCC unit, comprising:a vessel comprising a dilute phase bed and a dense phase bed of fluidized catalyst disposed in respective upper and lower regions of the vessel, wherein the catalyst comprises spent FCC catalyst having carbon deposited thereon; a spent catalyst distributor for distributing spent catalyst feed to the vessel; an air grid disposed adjacent a bottom of the dense phase fluidized catalyst bed for introducing oxygen-containing aeration fluid into the vessel; a baffle having a vertical midpoint disposed between the spent catalyst distributor and the air grid; an upper portion of the dense phase fluidized catalyst bed disposed above the vertical midpoint of the baffle and comprising at least 40 percent of the catalyst in the dense phase fluidized catalyst bed comprising a top portion of the dense phase fluidized catalyst bed, wherein the dense phase fluidized catalyst bed is free from oxygen-containing gas inlets above the baffle and wherein the spent catalyst distributor is positioned to distribute the spent catalyst feed onto the top of the dense phase fluidized catalyst bed; a line connected to an upper region of the vessel for discharging aeration fluid from the dilute phase; a line connected to a lower region of the vessel for withdrawing regenerated catalyst from the dense bed.