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Dielectric relaxation in zeolites
305 The stability constants of the different metal-resin complexes were calculated and compared with those of the water soluble monomer of the resinous active groups. The suggested method of calculation is justified by the reasonable agreement between the metal stability constants of the anchored and the water-soluble ligands. To be published in T a l a n t a .
A. Marton and J. Incz6dy, Department of Analytical Chemistry, University of Veszpr~m, Veszpr6m, Hungary: Study of Equilibria in a Three-Phase System Containing Ion Exchange Resin, Electrolyte Solution and Gas The removal of nitrate ions from drinking water can efficiently be carried out on a HCO 3 -form anion exchange resin. According to our experiments an economic regeneration can be achieved if the spent resin is first converted into the OH -form then to the HCO~-form by a treatment with carbon dioxide gas. The paper is concerned with the derivation of the equations used for the quantitative description of the equilibria in a three-phase system containing ROH(s)/KHCO3(1)/COz(g ). The presented system of equations if also used to calculate the equilibrium composition of the solution and resin phases as a function of the pressure of the carbon dioxide gas. To be published in T a l a n t a .
A. Marton and J. Incz6dy, Department of Analytical Chemistry, University of Veszpr6m, Veszpr~m, Hungary: Thermodynamic Data for Some Anion Exchange Reactions Thermochemical parameters for the anion exchange reaction R A + B ~ R B + A were determined by static equilibrium and precision calorimetric measurements at 25°C. (A - C I ; B - = C I O 4 . l , Br , NO 3 , HCO 3 , BrO -3, IO~ and OH ). For these exchange reactions the AGO and AH ° values show a well-defined linear relationship as a function of the so called thermochemical radii of the exchanging B ions. These latter parameters were calculated for the anions studied by the Kapustinskii equation using reliable values of the lattice energies. The observed linear relationship suggests that inside the resin the concentration is so high that the electrostatic situation approaches that prevailing in a solid crystalline phase. To be published in Therrnochim. Acta.
B.M. Katz, G.N. Shekhaleeva and F.B. Sherman, Odessa State University Physics Research Institute, Odessa, U.S.S.R.: The Influence of Preadsorbed Moisture on Equilibrium and Thermodynamics of Hydration of Anion Exchange Resins Anion exchange resins dried under conditions mild enough to keep their structure intact retain 2 to 4% firmly bound residual water. An aquametric technique is proposed for direct measurement of this residual moisture and the equilibrium moisture content of macroporous and gel-type anion exchange resins, using a modified McBain balance.
A. Szlisz, Sayed Sabet Abd E1 Rehim and J. Liszt, Department of Analytical Chemistry, University of Veszpr6m, Veszpr~m, Hungary: Dielectric Relaxation in Zeolites Dielectric studies were conducted over the ranges 200 Hz to 1 MHz and 260 K to 298 K on Na +, K ~, Rb +, C s ' , NH~- and CH3NH ~ forms of synthetic Linde A-type zeolite. The water content of the samples was controlled by standardized drying. Permittivity and loss factor were measured in suspensions of zeolite with paraffin oil. The relaxation process was described by the Kirkwood Fuoss relation and the distribution parameters (,8 and ~0m,~x) were determined. Arrhenius activation energies were calculated from the temperature dependence of ~0...... . Comparison of the effective dipole moment and that derived from the Onsager theory indicates relaxation of water. To be published in Acta. Chim. Hung.
A. Marton and J. Incz6dy, Department of Analytical Chemistry, University of Veszpr~m, Veszpr6m, Hungary: Study of Equilibria in a Three-Phase System Containing Ion Exchange Resin, Electrolyte Solution and Gas The removal of nitrate ions from drinking water can efficiently be carried out on a HCO 3 -form anion exchange resin. According to our experiments an economic regeneration can be achieved if the spent resin is first converted into the OH -form then to the HCO~-form by a treatment with carbon dioxide gas. The paper is concerned with the derivation of the equations used for the quantitative description of the equilibria in a three-phase system containing ROH(s)/KHCO3(1)/COz(g ). The presented system of equations if also used to calculate the equilibrium composition of the solution and resin phases as a function of the pressure of the carbon dioxide gas. To be published in T a l a n t a .
A. Marton and J. Incz6dy, Department of Analytical Chemistry, University of Veszpr6m, Veszpr~m, Hungary: Thermodynamic Data for Some Anion Exchange Reactions Thermochemical parameters for the anion exchange reaction R A + B ~ R B + A were determined by static equilibrium and precision calorimetric measurements at 25°C. (A - C I ; B - = C I O 4 . l , Br , NO 3 , HCO 3 , BrO -3, IO~ and OH ). For these exchange reactions the AGO and AH ° values show a well-defined linear relationship as a function of the so called thermochemical radii of the exchanging B ions. These latter parameters were calculated for the anions studied by the Kapustinskii equation using reliable values of the lattice energies. The observed linear relationship suggests that inside the resin the concentration is so high that the electrostatic situation approaches that prevailing in a solid crystalline phase. To be published in Therrnochim. Acta.
B.M. Katz, G.N. Shekhaleeva and F.B. Sherman, Odessa State University Physics Research Institute, Odessa, U.S.S.R.: The Influence of Preadsorbed Moisture on Equilibrium and Thermodynamics of Hydration of Anion Exchange Resins Anion exchange resins dried under conditions mild enough to keep their structure intact retain 2 to 4% firmly bound residual water. An aquametric technique is proposed for direct measurement of this residual moisture and the equilibrium moisture content of macroporous and gel-type anion exchange resins, using a modified McBain balance.
A. Szlisz, Sayed Sabet Abd E1 Rehim and J. Liszt, Department of Analytical Chemistry, University of Veszpr6m, Veszpr~m, Hungary: Dielectric Relaxation in Zeolites Dielectric studies were conducted over the ranges 200 Hz to 1 MHz and 260 K to 298 K on Na +, K ~, Rb +, C s ' , NH~- and CH3NH ~ forms of synthetic Linde A-type zeolite. The water content of the samples was controlled by standardized drying. Permittivity and loss factor were measured in suspensions of zeolite with paraffin oil. The relaxation process was described by the Kirkwood Fuoss relation and the distribution parameters (,8 and ~0m,~x) were determined. Arrhenius activation energies were calculated from the temperature dependence of ~0...... . Comparison of the effective dipole moment and that derived from the Onsager theory indicates relaxation of water. To be published in Acta. Chim. Hung.