Process to reduce NO.sub.x emissions from a fluid catalytic crac

Details Process to reduce NO.sub.x emissions from a fluid catalytic crac Process to reduce NO.sub.x emissions from a fluid catalytic crac

1988-06-30

1989-09-19

Konopka, Paul E.

Catalyst, solid sorbent, or support therefor: product or process

Regenerating or rehabilitating catalyst or sorbent

Gas or vapor treating

208161, 208164, 422144, 423239, 502 41, B01J 3834, B01J 2938, C10G 1105

Patent

active

048681440

ABSTRACT:
A multistage process for reducing NO.sub.x in flue gas from fluid catalytic cracking catalyst regeneration. Flue gas is preferably removed after each stage. NO.sub.x formed in each regeneration stage is converted to N.sub.2 prior to discharge from a stage by operating at least the downstream ends of each regeneration stage at oxygen-lean conditions. Staged regeneration can be achieved by passing spent catalyst through a transport reactor in plug type flow and sequentially contacting the catalyst with a plurality of oxygen-containing streams.

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