Systems and processes for residence time control in downer reactors

Abstract

A downer reactor assembly includes an outer disengager vessel, at least one downer reactor extending vertically from a top end to a lower end within the outer disengager vessel, and a mushroom-shaped distributor end cap positioned at the lower end of the at least one downer reactor. A process for cracking a hydrocarbon feedstock includes providing a catalyst feed to at least one downer reactor assembly. Discharging the catalyst feed at a lower end of at least one downer reactor underneath a mushroom-shaped distributor cap. The process includes separating hydrocarbon vapors from the catalyst feed under gravity and distributing upward flowing hydrocarbon vapors separated from the catalyst feed through nozzle holes in the mushroom-shaped distributor cap.

Dependencies are inferred from the claim text.