Fcc counter-current regenerator with regenerator riser

Abstract

A counter-current catalyst regenerator with at least two stages of counter-current contact along with a regenerator riser is proposed. Each stage may comprise a permeable barrier that allows upward passage of oxygen-containing gas and downward passage of coked catalyst into each stage, but inhibits upward movement of catalyst to mitigate back mixing and true counter-current contact and efficient combustion of coke from catalyst. The regenerator riser may provide a passage to transport the catalyst and may serve as a secondary stage for coke combustion to provide the regenerated catalyst.

Description

[0001] priority statement [0002] This application claims priority to U.S. Patent Application No. 62 / 439,346, filed December 27, 2016, the contents of which are hereby incorporated by reference in their entirety. technical field [0003] The field of the subject matter relates to catalyst regeneration in fluid catalytic cracking units, and more particularly to countercurrent catalyst regenerators with regenerator risers. Background technique [0004] Fluid catalytic cracking (FCC) is a hydrocarbon conversion process accomplished by contacting hydrocarbons in a fluidized reaction zone with a catalyst. As the cracking reaction proceeds, large amounts of high carbonaceous material called coke are deposited on the catalyst. The high temperature regeneration operation in the regeneration zone burns coke from the catalyst. Coke-containing catalyst (referred to herein as coked catalyst) is continuously removed from the reactor and replaced with substantially coke-free catalyst f...

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Problems solved by technology

[0011] FCC regenerators are large in size and expensive to construct

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