Regeneration of fluidizable catalyst

摘要

A method and apparatus for regeneration of coked catalyst resulting from a hydrocarbon conversion reaction in which catalyst regeneration is carried out in a plurality of superposed regeneration zones comprising the combination of a first dense phase fluidized bed regeneration zone, an entrained catalyst dilute phase regeneration zone superposed on said first regeneration zone, and a second dense phase fluid bed regeneration zone superposed on said dilute phase regeneration zone. Catalyst is regenerated by combustion of coke from the surface of the catalyst at an elevated temperature in the range of 675 DEG to 800 DEG C. with an excess of oxygen supplied by an oxygen-containing regeneration gas part of which is introduced into the first fluidized bed regeneration zone and part into said dilute phase regeneration zone, including a novel means of control of the rate of catalyst recirculated from said second dense phase regeneration zone to said first regeneration zone.