Method of regenerating a cracking catalyst

Details Method of regenerating a cracking catalyst Method of regenerating a cracking catalyst

1976-12-22

1978-07-04

Levine, Herbert

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Solids contacting and mixing

252417, 252419, C10G 1118

Patent

active

040986802

ABSTRACT:
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.

REFERENCES:
patent: 2589124 (1952-03-01), Packie
patent: 3012962 (1961-12-01), Dygert
patent: 3410793 (1968-11-01), Stranahan et al.
patent: 3629097 (1971-12-01), Smith
patent: 3838036 (1974-09-01), Stine et al.
patent: 3844973 (1974-10-01), Stine et al.
patent: 4006075 (1977-02-01), Luckenbach

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