Mineral oils: processes and products – Chemical conversion of hydrocarbons – Cracking
Reexamination Certificate
2011-03-22
2011-03-22
Griffin, Walter D (Department: 1774)
Mineral oils: processes and products
Chemical conversion of hydrocarbons
Cracking
C502S241000, C502S242000, C502S243000, C502S244000, C502S245000, C502S247000, C502S250000, C502S251000, C502S252000, C502S262000, C502S263000, C502S302000, C502S303000, C502S304000, C502S312000, C502S314000, C502S318000, C502S326000, C502S327000
Reexamination Certificate
active
07909986
ABSTRACT:
Reduced emissions of gas phase reduced nitrogen species in the off gas of an FCC regenerator operated in a partial or incomplete mode of combustion is achieved by contacting the off gas with an oxidative catalyst/additive composition having the ability to reduce gas phase nitrogen species to molecular nitrogen and to oxidize CO under catalytic cracking conditions. The oxidative catalyst/additive composition is used in an amount less than the amount necessary to prevent afterburn. Fluidizable particles of the oxidative catalyst/additives are circulated throughout the partial or incomplete burn FCC unit along with the FCC catalyst inventory. The flue gas having a reduced content of gas phase reduced nitrogen species and NOxis passed to a downstream CO boiler, preferably a low NOxCO boiler. In the CO boiler, as CO is oxidized to CO2, a reduced amount of gas phase reduced nitrogen species is oxidized to NOx, thereby providing an increase in the overall reduction of NOxemitted into the environment.
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Rudesill John Allen
Yaluris George
Artale Beverly J.
Cross Charles A.
Griffin Walter D
McCaig Brian
W. R. Grace & Co.,-Conn.
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