Catalytic cracking process and apparatus with refluxed spent cat

Details Catalytic cracking process and apparatus with refluxed spent cat Catalytic cracking process and apparatus with refluxed spent cat

1991-03-25

1993-09-28

Morris, Theodore

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Cracking

208120, 502 41, 502 44, 422143, 422144, 422145, 422146, 422147, C10G 1102, C10G 1104, B01J 818, F27B 1500

Patent

active

052484084

ABSTRACT:
A fluidized catalytic cracking process and apparatus operates with a single or multi- stage refluxed catalyst stripper. Recycle, or reflux, of stripped catalyst to the stripping zone improves stripping. Preferably, a two stage hot stripper is used. Addition of regenerated catalyst to spent catalyst from the reactor heats spent catalyst in a first stripping stage, which preferably uses stripping steam. Catalyst from the first stripping stage passes up through a second stage stripping zone with a heat removal means, e.g., a stab-in tube bundle. Steam or flue gas fluidizes catalyst, improves heat transfer and strips the catalyst. Some catalyst from the second stage stripper is preferably recycled to the inlet to the first stripping stage. Additional hot regenerated catalyst may be added downstream of the first catalyst stage to heat the second stripping stage, added to catalyst removed from the primary stripping zone which is sent to the regeneration zone.

REFERENCES:
patent: 4787967 (1988-11-01), Herbst et al.
patent: 4917790 (1990-04-01), Owen
patent: 5000841 (1991-03-01), Owen

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