FLUIDIZED CATALYST REGENERATION BY COKE OXIDATION IN A DENSE PHASE BED AND CATALYZED CARBON MONOXIDE CONVERSION IN A DILUTE PHASE TRANSPORT RISER

摘要

ABSTRACT OF THE DISCLOSUREA process for the regeneration of a coke-contaminated catalytic crack-ing catalyst removed from a hydrocarbon reaction zone, said catalyst contain-ing catalytically effective amounts of a CO conversion promoter comprisingone or more oxides of metals, and for the catalytic conversion of CO, re-sulting from the oxidation of coke from said catalyst, to carbon monoxide.The process comprises the steps of: oxidizing coke in a first dense bed ofcatalyst maintained in a regeneration zone to produce partially spent re-generation gas and regenerated catalyst; passing the regeneration gas andregenerated catalyst to a dilute phase transport riser wherein CO is essen-tially completely converted in the presence of the CU conversion promoter toCO2 and wherein at least a portion of the heat of CO conversion is trans-ferred to the regenerated catalyst; and, passing regenerated catalyst to asecond dense bed from which regenerated catalyst is returned to the hydro-carbon reaction zone.