초록 ▼

Coke is burned in the regenerator vessel of an FCC complex with a combustion medium consisting of a diluent gas, such as air, enriched with oxygen, The regenerator is operated in partial combustion mode and excess oxygen is introduced into the combustion zone of the regenerator. Emission of nitrogen

Coke is burned in the regenerator vessel of an FCC complex with a combustion medium consisting of a diluent gas, such as air, enriched with oxygen, The regenerator is operated in partial combustion mode and excess oxygen is introduced into the combustion zone of the regenerator. Emission of nitrogen oxides to the atmosphere is reduced.

대표청구항 ▼

[ What is claimed is:] [1.] A process for regenerating a hydrocarbon cracking catalyst having reduced nitrogen species-containing coke deposits thereon in a catalyst regeneration vessel comprising a combustion zone and a reducing zone comprising the steps:(a) contacting said catalyst with an oxygen-

[ What is claimed is:] [1.] A process for regenerating a hydrocarbon cracking catalyst having reduced nitrogen species-containing coke deposits thereon in a catalyst regeneration vessel comprising a combustion zone and a reducing zone comprising the steps:(a) contacting said catalyst with an oxygen-inert gas mixture in said combustion zone at an average temperature in the range of about 650 to about 815.degree. C., the oxygen introduced into said combustion zone constituting at least about 24% of said mixture and said mixture being introduced into said combustion zone independently of said hydrocarbon cracking catalyst, thereby combusting at least part of said coke and effecting conversion of at least part of the reduced nitrogen species in the coke to nitrogen oxides to produce a substantially oxygen-free combustion gas comprising carbon dioxide, nitrogen oxides and at least about 1% carbon monoxide; and(b) passing said combustion gas through said reducing zone, thereby converting most of said nitrogen oxides to elemental nitrogen.