MEASUREMENT OF THE ACIDITIES OF SEVERAL CATION-EXCHANGE RESINS USING HYDROGEN-ISOTOPE EXCHANGE-REACTION

The hydrogen-isotope exchange reaction between ethanol (unlabeled) and one of three cation-exchange resins labeled with tritium has been observed at 40 approximately 80-degrees-C. The acidity (acidity based on kinetic logic) at each temperature has been obtained from a A''-McKay plot based on the respective data obtained. The following results have been obtained on the basis of both the acidities obtained in this work and the acidities (of several materials) obtained previously. (1) The order of the reactivity is (Amberlite IRC-76) > (Dowex A-1) > (PVA2000) > (Amberlite IRC-50) at 60-degrees-C. (2) The higher the temperature, the larger is the reactivity of each material. (3) The temperature dependence of the reactivity of Dowex A-1 is the largest in the four. (4) The reactivity of the functional group (i.e., COOH group or OH group) bonded to the polymer chain can be clarified using the A''-McKay plot method. (5) It seems that method can be applied to analyze other reactions, e.g., other isotope-exchange reactions, surface reactions, catalytic reactions, etc.