Distribution of saccharides and salts on amphoteric ion-exchange resin

An amphoteric ion-exchange resin hardly shrank in 550 and 300 g/L glucose and sodium chloride solutions, respectively; however, the bed packed with a cation-exchange resin shrank considerably. From the distribution coefficients of some saccharides, the swelling pressure of the amphoteric ion-exchange resin was estimated to be 2.0 MPa at 25 °C. The distribution coefficients of glucose, galactose, fructose, and mannose were independent of their concentration and were about 0.621. On the other hand, the apparent distribution coefficients of NaF, NaCl, NaBr, NaI, LiCl, KCl, and CsCl largely depended on concentration. A model for the distribution of salts on the amphoteric resin was proposed, assuming an interaction between the anion of the salt and the positively charged fixed ions with binding constant B. The B values of the chloride salts were nearly the same (1.69-2.94 L/mol), while the values of the sodium salts were largely different depending on the anion.