FLUIDIZED CATALYST REGENERATION BY OXIDATION IN A DENSE PHASE BED AND A DILUTE PHASE TRANSPORT RISER

摘要

A process in which spent catalyst is regenerated with or without the complete combustion of CO in a regeneration zone comprising a first dense bed, a dilute phase transport riser and a second dense bed. Higher velocities and higher O2 concentrations employed within the regeneration zone result in shorter catalyst and gas residence time, reduced catalyst inventory, lower catalyst makeup rate, improved regeneration, and improved catalyst stability. The substantially complete combustion of CO eliminates CO pollution of the atmosphere without the need for a CO boiler and decreases feed preheat requirements.