Abstract
AbstractFiltration experiments with phenolsulfonic acid‐formaldehyde cation exchange membranes are carried out with aqueous solutions containing two electrolytes with a common anion: HCl/NaCl, HCl/CaCl2 and NaCl/SrCl2. The concentration difference of each electrolyte between the high pressure phase and the filtrate in the stationary state has the same sign as the reflection coefficients of the electrolytes in the mixtures determined in independent experiments. This confirms theoretical predictions. Corresponding experiments with Nafion membranes show the influence of unstirred layers on the sign of the concentration difference in filtration experiments.
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