FI762613

Improvements made to the subject of main patent no. 415,063 issued May 6, 1975 for: "A process to regenerate spent particulate catalyst contaminated with coke," discharged from a hydrocarbon conversion zone, and containing catalytically effective amounts of a CO conversion activator, which it comprises the steps of: (a) introducing said exhausted catalyst, and an oxygen-containing regeneration gas, into a first dense bed of fluidized particles, and partially regenerating said catalyst by combustion of said coke, and producing partially regeneration gas depleted containing CO, (b) directly passing the partially regenerated catalyst and the resulting partially depleted regeneration gas, from said dense bed, upwards, in dilute phase, to and through the dilute phase conveyor pipeline, and effect an additional combustion of coke from said partially regenerated catalyst, and also oxidize it at least s a part of said CO to CO2 in said dilute phase conveyor riser pipe, (c) separating the resulting regenerated catalyst from the regeneration gas, (d) recovering said regenerated catalyst in the form of a second dense bed of particles, and (e) removing regenerated catalyst from said second dense bed to return it to said conversion zone. (Machine-translation by Google Translate, not legally binding)