Mineral oils: processes and products – Chemical conversion of hydrocarbons – Cracking
Patent
1991-01-24
1992-07-14
Morris, Theodore
Mineral oils: processes and products
Chemical conversion of hydrocarbons
Cracking
208164, 502 40, 502 41, 502 42, 502 43, 422144, C10G 1100
Patent
active
051300125
ABSTRACT:
A fluidized catalytic cracking process using a high efficiency regenerator comprising a coke combustor, a dilute phase transport riser, and a second fluidized bed with catalyst recirculation to the coke combustor, is operated to reduce NO.sub.x emissions in the regenerator flue gas. The amount of catalyst recirculation from the second fluidized bed to the coke combustor or combustion air addition or preferably both are adjusted based on continuous or periodic measurement of a process parameter of the FCC regenerator which directly or indirectly measures the NO.sub.x content of regenerator flue gas. Operation with restricted air or catalyst recirculation degrades coke combustor operation, shifts some regeneration to downstream portions of the regenerator, and reduces NO.sub.x emissions.
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Edwards Michael S.
Land David A.
Markham Catherine L.
Misiewicz Joseph R.
Schields John P.
Diemler William C.
McKillop Alexander J.
Mobil Oil Corporation
Morris Theodore
Speciale Charles J.
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