Process for preparing ammonium zeolites of low alkali metal...

C - Chemistry – Metallurgy – 01 – B

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C01B 39/20 (2006.01) B01J 29/08 (2006.01) B01J 37/30 (2006.01)

Patent

CA 2145201

Ammonium zeolites of extremely low alkali metal content are prepared by a process of potassium ion exchange followed by ammonium ion exchange. Zeolite X or zeolite Y that contain a significant amount of sodium are contacted with a potassium salt solution under conditions that provide a substantial exchange of potassium for sodium. The potassium enriched zeolite is then contacted with an ammonium salt solution so that the ammonium ion replaces the sodium and potassium ions. The resulting ammonium zeolite X or Y contains considerably less than 1 % alkali metal calculated as Na2O.

On obtient des zéolites d'ammonium à teneur extrêmement basse en métaux alcalins grâce à un procédé d'échange d'ions ammonium suivi d'un échange d'ions potassium. Un zéolite X ou un zéolite Y à teneur élevée de sodium est mis en contact avec une solution de sels de potassium dans des conditions permettant un échange important de potassium contre le sodium. Le zéolite enrichi en potassium est ensuite mis en contact avec une solution de sels d'ammonium de sorte que les ions ammonium remplacent les ions sodium et potassium. Les zéolites ammoniacaux X et Y qui en résultent contiennent nettement moins de 1 % de métaux alcalins (sous forme de Na2O).

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