Chemistry of inorganic compounds – Nitrogen or compound thereof – Ammonia or ammonium hydroxide
Patent
1992-07-02
1994-04-19
Langel, Wayne
Chemistry of inorganic compounds
Nitrogen or compound thereof
Ammonia or ammonium hydroxide
210681, C02F 142
Patent
active
053043650
ABSTRACT:
Mineral aluminosilicates enhanced as ion-exchange media for separating diverse ionic materials are provided by dry heating. A hydrated mineral alumino-silicate is irreversibly dehydrated in part, to improve the ratio of its affinity for preferred ions, relative to non-preferred ions, even though doing so reduces its affinity for both types of ions. Such dehydration is accomplished by heating the aluminosilicate until a temperature is reached at which its affinity for non-preferred cations is reduced enough that the ratio of its affinity for preferred ions to its affinity for non-preferred ions is greatly increased. Such aluminosilicates may be zeolites, such as clinoptilolite, or layered clays, such as vermiculite or smectite. 850.degree. C. is an example of such temperature.
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J. R. Klieve and M. J. Semmons, "an Evaluation of Pretreated Zeolites for Ammonium Revoval," Water Research, vol. 14, pp. 161-168 (Pergamon Press, 1980).
Langel Wayne
McClure Charles A.
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