Process for producing mixed-cation zeolites

Details Process for producing mixed-cation zeolites Process for producing mixed-cation zeolites

B - Operations, Transporting

01

J

B01J 20/30 (2006.01) B01J 20/18 (2006.01)

Patent

CA 2191812

Zeolites containing mixed cations are conveniently prepared by saturating the zeolites with the less strongly held cation, and then injecting the more strongly held cations in a pulse in a recirculating brine solution containing the less strongly held cation. The more strongly held cation is thus exchanged with the less readily held cation on the surface of the zeolite, after which the particles are allowed to equilibrate, with the distribution of the cations within the particles approaching an equilibrium value.

Des zéolites contenant des cations mixtes sont commodément préparées par saturation des zéolites avec le cation le moins fortement retenu et par injection, par impulsion, des cations les plus fortement retenus dans une solution de saumure recirculante contenant le cation le moins fortement retenu. Le cation le plus fortement retenu est ainsi échangé avec le moins fortement retenu à la surface de la zéolite, après quoi on laisse les particules s'équilibrer, la distribution des cations à l'intérieur des particules approchant une valeur d'équilibre.

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