A standard method was developed for investigation of the adsorbed water in ionexchange resins. The previously-dried anion-exchange resins in Cl, SO4 and HSO4 form were investigated by simultaneous TG, DTG and DTA measurements (derivatograph), and the evolved gases were passed through the continuous and selective water detector system developed earlier. It was found that in the case of SO4 and HSO4-form resins two types of water binding (loosely and strongly-bound water) could be distinguished. The second step, the stronglybound water step, could not be observed in the DTG curves, because the release of the bound water and the decomposition of the fixed ionic group take place simultaneously. As the two types of water peaks strongly overlap, their quantitative evaluation was carried out by graphical analysis.
ASJC Scopus subject areas
- Chemical Engineering(all)