Process for zeolitic catalyst reactivation

Details Process for zeolitic catalyst reactivation Process for zeolitic catalyst reactivation

1996-11-25

1999-03-30

Lewis, Michael

Catalyst, solid sorbent, or support therefor: product or process

Regenerating or rehabilitating catalyst or sorbent

Treating with a liquid or treating in a liquid phase,...

502 27, 502 33, B01J 3858, B01J 3848, B01J 7034

Patent

active

058889191

ABSTRACT:
A spent zeolite-containing hydrocarbon cracking catalyst is treated by regenerating it to remove carboneous deposits. A portion of the regenerated catalyst is withdrawn from the circulating catalyst inventory of a hydrocarbon processing unit and slurried with a liquid containing an activating agent to solubilize and/or dislodge contaminants which block the pores of the zeolite and adversely affect the activity of the catalyst. The slurry is agitated to dissolve or dislodge the contaminants from the zeolite pores, and the agitated slurry, without being permitted to settle, is transferred to a fluidized drying zone where the liquid and solubilized and/or dislodged contaminants are removed from the treated catalyst which has a level of cracking activity higher than that of the catalyst in the circulating catalyst inventory. The treated catalyst is then recycled to the unit and contacted with a hydrocarbon feedstock under cracking conditions.

REFERENCES:
patent: 2548912 (1951-04-01), Savage
patent: 3647718 (1972-03-01), Haden, Jr. et al.
patent: 3703886 (1972-11-01), Witzky
patent: 4678764 (1987-07-01), Le et al.
patent: 4826793 (1989-05-01), Velten
patent: 5188995 (1993-02-01), Maholland et al.

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