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Characterization of poly(ether/amide) and poly(ether/urea) thin film composite membranes by transport coefficients

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Pusch,  Wolfgang
Department of Physical Chemistry, Max Planck Institute of Biophysics, Max Planck Society;

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Riley,  Robert
Department of Physical Chemistry, Max Planck Institute of Biophysics, Max Planck Society;

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Citation

Pusch, W., & Riley, R. (1977). Characterization of poly(ether/amide) and poly(ether/urea) thin film composite membranes by transport coefficients. Desalination, 22(1-3), 191-203. doi:10.1016/S0011-9164(00)88375-7.


Cite as: https://hdl.handle.net/21.11116/0000-0008-C23B-B
Abstract
Several thin-film composite membrane systems, Poly(ether/amide) and Poly-ether/urea) have been characterized in hyperfiltration and dialysis-osmosis experiments. Using the phenomenological relationships of the thermodynamics of irreversible processes, the hydrodynamic permeability, lp, the osmotic permeability, lπ, the asymptotic salt rejection, r , and the reflection coefficient, σ, have been determined as functions of NaCl concentration at 25δC. All membranes yielded large values of r even at brine concentrations of 0.5 M NaCl and a small variation of salt rejection r, with pressure corresponding to a ratio of lπ/lπ not much larger than r2. The reflection coefficients received from dialysis-osmosis experiments differ substantially from the corresponding values of the asymptotic salt rejection, r. A comparison between the transport coefficients of these thin-film composite membranes and the transport coefficients of some asymmetric cellulose acetate membranes show that the thin-film composite membranes behave much more like a semipermeable membrane.