Method of manufacture of molecular sieves

Details Method of manufacture of molecular sieves Method of manufacture of molecular sieves

1997-04-01

1999-06-29

Lewis, Michael

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

Zeolite or clay, including gallium analogs

Activating treatment

502 64, 502 60, 502 73, 502 79, 502 78, 502 80, 502 84, C01B 3902

Patent

active

059168366

ABSTRACT:
Zeolites exchanged with lithium ions and, optionally, with polyvalent cations are prepared by ion-exchanging a sodium-containing zeolite, a potassium-containing zeolite or a sodium- and potassium-containing zeolite with ammonium ions, thereby replacing the sodium and/or potassium ions with ammonium ions, and then reacting the ammonium ion-exchanged zeolite with a water-soluble lithium compound under conditions which result in the removal of ammonia from the reaction zone. Polyvalent ions, which may be present in the zeolite undergoing ion-exchange, will not be substantially replaced by the ammonium or lithium ions.

REFERENCES:
patent: 3405055 (1968-10-01), Bittner
patent: 3576901 (1971-04-01), Kokotailo et al.
patent: 3732326 (1973-05-01), Chen
patent: 3794598 (1974-02-01), Schlaffer
patent: 3985859 (1976-10-01), Blaine
patent: 4724275 (1988-02-01), Hinnenkamp et al.
patent: 5268023 (1993-12-01), Kirner
patent: 5464467 (1995-11-01), Fitch et al.

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