Process for decoking fluid catalytic cracking catalyst

Details Process for decoking fluid catalytic cracking catalyst Process for decoking fluid catalytic cracking catalyst

1989-05-22

1990-11-06

Pak, Chung K.

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Cracking

208164, 502 41, 502 42, 502 43, C10G 1100

Patent

active

049684043

ABSTRACT:
In a fluid catalytic cracking process, coke is burned from spent catalyst at elevated temperature in a vertically arranged regenerator vessel. The regenerator vessel contains a lower, dense phase oxidation zone to which spent catalyst is introduced and an upper, dilute phase oxidation zone. Catalyst is fluidized and oxidized by means of air which is introduced in an amount of 5 vol % to 15 vol % to a lower air distributor at the bottom of the dense phase zone. Spent catalyst is discharged above the lower air distributor. The balance of the air is distributed in a horizontal plane in the dense phase above the catalyst discharge. As a result, a substantial proportion of the coke and carbon monoxide is burned in the dense phase zone at a lower temperature. A reduced amount of carbon monoxide is carried over to the dilute phase where higher temperature oxidation occurs.

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