ION-EXCHANGE ISOTHERMAL SUPERSATURATION

The paper describes the new phenomenon called Ion-Exchange Isothermal Supersaturation (IXISS). This effect is observed for a number of ion-e xchange systems, where frontal or reverse frontal separation is accomp anied by the formation of stable supersaturated solutions of slightly soluble substances in the interstitial space of ion-exchange columns. After leaving the column a supersaturated solution crystallizes sponta neously, which allows for designing practically ideal ion-exchange pro cess where a crystalline product is obtained right after the ion-excha nge purification cycle. The paper comprises results on experimental in vestigation of IXISS of amino acids (e.g., such as glutamic, aspartic and some others), calcium and magnesium salts (sulfates and carbonates ), and some other substances. The mechanisms of stabilization of super saturated amino acid solutions in the interstitial space is proposed a nd confirmed experimentally. Methods for identification of substances exhibiting the IXISS effect and practical application of the IXISS phe nomenon for separation and ion-exchange synthesis of substances and so me other problems are discussed.