SOLID STATES ION-EXCHANGE BETWEEN HALIDES AND ZEOLITES

Solid-state ion exchange of Na+ in dehydrated NaA zeolite for K+ or Li + can be conducted to a high degree by heating the mixture of alkali-h alide and NaA zeolite at elevated temperature below the melting point of the alkali-halide. A part of the reactant product NaCl diffuses out of zeolite pores and Crystallizes itself or with residual former hali des. The higher the elevated temperature is the greater the ion exchan ge degree is. There is the largest ion exchange degree at a heating te mperature.