Process for producing mixed-cation zeolites

Details Process for producing mixed-cation zeolites Process for producing mixed-cation zeolites

1996-03-04

1997-02-18

Lewis, Michael

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

Zeolite or clay, including gallium analogs

502 79, B01J 2904

Patent

active

056041691

ABSTRACT:
Zeolites containing mixed cations are conveniently prepared by saturating the zeolites with the less strongly held cation, and then injecting the more strongly held cations in a pulse in a recirculating brine solution containing the less strongly held cation. The more strongly held cation is thus exchanged with the less readily held cation on the surface of the zeolite, after which the particles are allowed to equilibrate, with the distribution of the cations within the particles approaching an equilibrium value.

REFERENCES:
patent: 3542509 (1970-11-01), Furtig et al.
patent: 4557736 (1985-12-01), Sircar et al.
patent: 4859217 (1989-08-01), Chao
patent: 5152813 (1992-10-01), Coe et al.
patent: 5174979 (1992-12-01), Chao et al.
patent: 5258058 (1993-11-01), Coe et al.
patent: 5268023 (1993-12-01), Kirner
"Lithium Zeolites Enhance Nitrogen Separation by PSA", Process Engineering, 70 #5, p. 22, 1989 (no month).

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