System for regenerating fluidizable catalyst particles

Abstract

Abstract A hydrocarbon conversion-catalyst regeneration operation is described which relies upon an upflowing fluid catalyst mass generally decreasing in density of catalyst particles superimposed by an upflowing more dispersed catalyst phase undergoing catalyst regeneration and combustion of combustible materials to effect elevated temperature regeneration of catalyst deactivated by hydrocarbonaceous material under conditions providing low CO levels in the flue gas and generally less than 0.15 mol percent in the flue gas separated from regenerated catalyst particles. Regenerated catalyst at an elevated temperature of regeneration is mixed with spent catalyst recovered from hydrocarbon conversion in a first contact zone in the presence of a fluidizing gas to obtain an initial mix temperature of at least 1175° F. before contact with a secondary oxygen containing regeneration gas stream in a more dense catalyst phase as a part of the upflowing fluid catalyst mass. The ratio of hot regenerated catalyst to spent catalyst is restricted to obtain a mix temperature particularly promoting the combustion of hydrocarbonaceous material with oxygen containing gas in the upflowing catalyst phases comprising dense and dispersed catalyst phase so as to recover catalyst discharge from said uppermost dispersed catalyst phase at a temperature of at least 1350° F.

Inventors

• 👤 Hartley Owen

Bibliographic Details