Apparatus to reduce NO.sub.x emissions from a fluid catalytic cr

Details Apparatus to reduce NO.sub.x emissions from a fluid catalytic cr Apparatus to reduce NO.sub.x emissions from a fluid catalytic cr

1988-05-02

1989-08-01

Marcus, Michael S.

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Fluidized bed

422142, 422145, 422147, F27B 1508, F27B 1500

Patent

active

048531871

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. A portion of NO.sub.x formed in an upstream portion of first and second regeneration stages is converted to N.sub.2, prior to discharge from the first and second stages, respectively, by operating downstream ends of the respective first and second stages at oxygen-lean conditions. The present invention also may provide staged regeneration, to reduce NO.sub.x in flue gas, 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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