Method of manufacture of multicationic molecular sieves
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United States of America Patent
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Jun 18, 2002
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N/A
app pub date -
Feb 10, 2000
filing date -
Feb 10, 2000
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Expired
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Abstract
Zeolites exchanged with lithium cations and polyvalent cations are prepared by first partially ion-exchanging a sodium-containing zeolite, a potassium-containing zeolite or a sodium- and potassium-containing zeolite with polyvalent cations, then heat-treating the partially polyvalent cation-exchanged zeolite, then ion exchanging the heat-treated zeolite with ammonium cations, and then reacting the ammonium cation-exchanged zeolite with a water-soluble lithium compound under conditions which result in the removal of ammonia from the reaction zone.
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