Catalyst – solid sorbent – or support therefor: product or process – Regenerating or rehabilitating catalyst or sorbent – Gas or vapor treating
Patent
1989-03-13
1991-03-05
Konopka, Paul E.
Catalyst, solid sorbent, or support therefor: product or process
Regenerating or rehabilitating catalyst or sorbent
Gas or vapor treating
208113, 208120, 208164, 422144, 423235, 502 21, 502 41, B01J 3836, B01J 2938, C10G 1118, C01B 2120
Patent
active
049978004
ABSTRACT:
A process for fluidized bed catalyst regeneration while minimizing emissions of NOx. The process uses a single, dense phase fluidized bed of particles wherein a combustible substance is burned to produce heat and a flue gas containing CO, CO2, O2 and NOx. A CO combustion promoter, present in an amount sufficient to increase the combustion of CO to CO2 in the dense bed, is disposed on particles having a settling velocity which is smaller than the settling velocity of the particles in the dense phase fluidized bed. CO combustion promoter segregates in the dense phase fluidized bed so that a majority of the combustion promoter is present in an upper one half of the dense bed. Maintaining a reducing atmosphere in the lower one half of the dense bed converts at least a portion of the NOx produced during combustion to nitrogen in the reducing atmosphere. Preferably an external means is provided to recover entrained CO combustion promoter from fines generated in the fluidized bed. An external, dense phase fluidized bed may be used to effect separation by density differences, or flotation separation, using a liquid with a density intermediate the density of the promoter and the fines may be used.
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Konopka Paul E.
McKillop Alexander J.
Mobil Oil Corporation
Speciale Charles J.
Stone Richard D.
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