Catalyst – solid sorbent – or support therefor: product or process – Zeolite or clay – including gallium analogs – And additional al or si containing component
Patent
1996-11-26
1999-11-23
Dunn, Thomas
Catalyst, solid sorbent, or support therefor: product or process
Zeolite or clay, including gallium analogs
And additional al or si containing component
502 64, 502 74, 502 78, 502 85, B01J 29064, B01J 2920
Patent
active
059900318
ABSTRACT:
An improved zeolite catalyst having enhanced dealkylation activity is provided. The catalyst is prepared by incorporating fluorine into the zeolite structure. In another embodiment, a transition element such as nickel is additionally incorporated into the zeolite structure. The process for producing the catalyst also includes ion-exchange and calcining steps. A mordenite type catalyst has been found to be particularly effective. The catalyst of the present invention demonstrates improved activity for the dealkylation of polyalkylaromatic compounds found in residue from the alkylation process and in heavy reformate streams from refineries. A dealkylation process using the catalyst of the present invention is provided. The dealkylation process shows good selectivity for benzene and monoalkylated aromatic products, and catalyst stability, particularly at high reaction temperatures.
REFERENCES:
patent: 3619412 (1971-11-01), Clement et al.
patent: 5215736 (1993-06-01), Caullet et al.
"Fluorine-Promoted Catalyst", By Ashim Ghosh and Ron Kydd, Catalysis Reviews, 27(4) 539-589 (1985).
"Acidity and Activity fof Fluorinated Mordenites", by Ashim Ghosh and Ron Kydd, Journal fo Catalysis, 103, 399-406 (1987).
"An Infrared Study of the effect of HF treatment on the acidity of ZSM-5", by Ashim Ghosh and Ron Kydd, Zeolite, 10, 766-771(1990).
Cheairs M. Norwood
Dunn Thomas
Fina Technology, Inc.
Jackson William D.
Smith Pamela S.
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