FCC process with combined regenerator stripper and catalyst blen

Details FCC process with combined regenerator stripper and catalyst blen FCC process with combined regenerator stripper and catalyst blen

1997-12-05

1999-01-12

Griffin, Walter D.

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Cracking

502 38, 502 41, 502 45, 502 47, C10G 1100, B01J 2034

Patent

active

058582070

ABSTRACT:
An FCC arrangement uses a regenerator stripper vessel for removing CO and light hydrocarbons upstream of the regeneration zone that can operate with backmix addition of regenerated catalyst directly from the regeneration zone. The regenerator stripping vessel can also serve as a blending vessel for an the transfer of spent and regenerated catalyst back to the reaction zone for increasing the catalyst to oil ratio of the process. This invention makes the recycle of spent catalyst in large proportions possible for an FCC operation that cracks a heavy feed by eliminating light combustibles such as CO and light hydrocarbons from the regeneration zone. Elimination of light gases permits spent catalyst to be recycled to the riser despite the high delta coke produced by the heavy feed. The arrangement also offers versatility to the operation of the reaction zone since the system can be used with or without the blending of spent catalyst and to the operation of the regenerator stripper vessel which can vent the off gases to the regenerator vessel or another location such as the reactor. The arrangement is particularly suited for revamps of older stacked FCC units to accommodate heavier feed processing and spent and regenerated catalyst blending.

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