Ammonium faujasite zeolites
AssigneeFiltrol Corporation
InventorsHamid Alafandi, Dennis Stamires
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Abstract
A process of producing an ammonium zeolite of the faujasite type in which a zeolite of the faujasite type whose exchange sites are substantially entirely occupied by Na cations, is treated with an ammonium salt solution to exchange substantially all of the Na cations with NH.sub.4 cations with substantially no impairment of crystallinity by a control of the relation of the equivalents of NH.sub.4 in the solution to equivalents of Na in the zeolite.
Claims6
A method of producing ammonium zeolites of the faujasite type which comprises mixing a zeolite of the faujasite type whose exchange position is substantially entirely occupied by Na cations with a solution of an ammonium salt, the quantity of the zeolite, and the concentration of the ammonium cations, being in quantity sufficient to establish a ratio of the equivalents of NH.sub.4 cation in the solution, per equivalent of Na cation in the zeolite in the mixture in excess of about 25, heating the solution to a temperature above about 300.degree. and less than about 450.degree. F for a period of time to reduce the sodium content of the zeolite, expressed as Na.sub.2 O, to less than about 1.5% by weight of the exchanged zeolite, on a volatile free basis, and washing the zeolite substantially free of cations of the salt in solution.
Dependencies are inferred from the claim text.