Patent ID: 7655589

Claim:
A process for the regeneration of a spent FCC catalyst utilizing a regenerator vessel having a lower end and an upper end, wherein said process comprises: forming, within said regenerator vessel, a dense phase catalyst zone, containing catalytic cracking catalyst particles, which is positioned at said lower end below a dilute phase catalyst zone positioned at said upper end; forming within said dense phase catalyst zone a high velocity central region and a low velocity annular region by introducing a high superficial velocity fluidization gas stream containing oxygen within said high velocity central region of said dense phase catalyst zone and by introducing a low superficial velocity fluidization gas stream containing oxygen into said low velocity annular region of said dense phase catalyst zone; introducing a spent catalytic cracking catalyst into said high velocity central region within said dense phase catalyst zone; removing a regenerated catalytic cracking catalyst from said low velocity annular region within said dense phase catalyst zone; and removing a flue gas from within said upper end of said regenerator vessel; wherein, there is an absence within said dense phase catalyst zone of vertical partition means for separating said high velocity central region and said low velocity annular region.