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Sorpce kapalné směsi metanol-benzen v polymerních membránách
Randová, A. ; Bartovská, L. ; Izák, Pavel ; Hovorka, Š. ; Friess, K.
The solubility of single mixture components in the membrane is important for the effectivity of membrane separation processes. This information is accessible from the experimental data on the preferential sorption in combination with the experimental data on the total amount of the sorbed liquid. The sorption from binary liquid solutions methanol-benzene in Nafion and low density polyethylene membranes has been studied in the whole concentration range at constant temperature of 25°C.
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Influence of Organic Electrolytes Presence on Swelling of Nafion Membrane in Methanol-Water Mixtures
Randová, A. ; Hovorka, Š. ; Izák, Pavel ; Bartovská, L.
The anisotropic swelling of Nafion 112 foil in methanol - water - inorganic salt was examined. Our results show that even small addition of inorganic salt into methanol - water mixture affects kinetics as well as the swelling equilibrium. The effect of inorganic salts LiCl, NaCl, KCl, CsCl, CaCl2, CdCl2, K2CO3, KNO3, NH4Cl, and AgNO3 was studied. Swelling kinetics of Nafion in ternary mixtures including salt show maximum suggesting that effect of methanol-water is faster but effect of inorganic salt is stronger. Theexperimental data, presented in this work allow us to assume that swelling of Nafion decreases with increasing ionic radius of cation.
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Sorpce organických látek v nízkohustotní polyethylenové membráně
Friess, K. ; Machková, J. ; Šípek, M. ; Bartovská, P. ; Sysel, P. ; Izák, Pavel
This paper deals with the sorption of organic vapors (benzene, toluene, cyclohexane, hexane, heptane, acetone, methanol and chloroform) in low density polyethylene membrane BRALEN FB2-30 at 298 K. The sorption of all matters from liquid phase at the same temperature is also under study. The sorption apparatus with Mc Bain spiral quartz balance enabled to follow the sorption kinetics and from experimental data the polymer-solvent interaction parameters were calculated on the bases by Flory-Huggins theory.
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