A process for regenerating spent fluidized catalytic cracking catalyst

Abstract From the Canadian patent

In a process for controlled, multi-stage regeneration of FCC catalyst, a modified high efficiency catalyst regenerator (80), with a fast fluidized bed coke combustor (62) dilute phase, transport riser (83), and second fluidized bed (82) regenerates the catalyst in at least two stages. The primary stage of regeneration is in the coke combustor (62), whereas a second stage catalyst regeneration occurs in the second fluidized bed (82). The amount of combustion air added to, and conditions in the coke, combustor (62) are controlled to limit CO combustion while, the second stage of regeneration in the second fluidized bed, (82), achieves complete CO combustion. Controlled multi-stage …