Method of removing NH.sub.3 and HCN from and FCC regenerator off

Details Method of removing NH.sub.3 and HCN from and FCC regenerator off Method of removing NH.sub.3 and HCN from and FCC regenerator off

1992-04-24

1993-08-31

Heller, Gregory A.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

423237, 208113, C01C 300, C10G 1100

Patent

active

052406903

ABSTRACT:
A method is disclosed for the addition of an oxygen-containing gas under certain defined process conditions, to an off-gas stream derived from an FCC regenerator which is operated in a partial mode of combustion. The off-gas from the regenerator contains 1-6% CO by volume and at least 300 ppm nitrogen compounds comprising NH.sub.3 and HCN. Without the addition of an oxygen-containing gas, roughly 25 percent of the NH.sub.3 and HCN are converted to NO.sub.x in downstream CO boilers. A preferable method of this invention comprises the addition of heated air (20% O.sub.2) into the regenerator off gas to produce an off gas stream having a temperature of 1260.degree. F. to 1500.degree. F.

REFERENCES:
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patent: 5173278 (1992-12-01), Marles et al.

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