Nanofiltration membrane behavior in a supercritical medium |
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Authors: | S Sarrade GM Rios M Carlés |
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Institution: | 1. Commissariat à l''Energie Atomique (CEA), Rhône Valley Research Center, BP 111, 26072 Pierrelatte Cedex, France;2. Laboratoire des Matériaux et des Procédés Membranaires, Université de Montpellier II, Place Eugéne Bataillon, 34095 Montpellier Cedex 05, France |
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Abstract: | The permeability values of “TN” organomineral nanofiltration membranes to water, L, and to supercritical CO2, G, were compared. The resulting values for G were an order of magnitude higher than for L. The difference may be directly related to the viscosity difference between the two fluids. Temperature- and pressure-related variations in G were also analyzed; for this purpose, Poiseuille's model satisfactorily accounts for experimental behavior, while Knudsen's model is unsuitable. A hysteresis effect was observed on the isotherms corresponding to variations in G versus pressure, suggesting partially irreversible CO2 adsorption on the micropore walls, that would diminish the radius. This phenomenon could be enhanced by an increased fluid density and viscosity. |
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Keywords: | Nanofiltration Permeability Supercritical CO2 Modeling |
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