| 摘要 |
An improved method for regenerating a catalytic cracking catalyst which comprises the steps of (1) increasing the temperature of the regeneration zone dense phase catalyst bed to a desired level above that normally employed during the regeneration so as to accelerate the rate of carbon conversion, (2) reducing the coke make in the reaction zone while maintaining the elevated temperature obtained in step (1) so as to increase the oxygen concentration in said regeneration zone so as to establish low levels of carbon monoxide in the flue gas and (3) reducing the temperature of the regeneration zone dense phase catalyst bed below the elevated temperature obtained in steps (1) and (2) while maintaining low levels of carbon monoxide in the flue gas. According to this invention, the flue gas may contain less than 0.05 volume %, preferably less than 0.02 volume %, carbon monoxide and, as such, may be discharged directly to the atmosphere with no discernable effect upon ambient air quality.
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