The permeation of binary gas mixtures through support structures of composite membranes |
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| Institution: | 1. W. L. Gore and Assoc., Inc., PO Box 1320, ElktonMD 21922-1320USA;2. Department of Chemical Engineering, Clemson University, ClemsonSC 29634-0909USA;1. Via delle Mimose 18, 64025 Pineto, Teramo, Italy;2. Université de Lyon – Ecole Nationale des Travaux Publics de l''Etat – LGCB/LTDS –UMR-CNRS 5513, Rue Maurice Audin, 69518 Vaulx-en-Velin, France;3. National Center for Physical Acoustics, University of Mississippi, University, MS 38677, United States;1. Institute for Sustainability and Innovation, College of Engineering and Science, Victoria University, P.O.BOX 14428, Melbourne, VIC 8001, Australia;2. School of Engineering and Science, Victoria University, Werribee 3030, Victoria, Australia;3. The University of Sydney, School of Chemical and Biomolecular Engineering, Sydney, NSW 2006, Australia;4. The University of Queensland, FIM 2Lab – Functional Interfacial Materials and Membranes Laboratory, School of Chemical Engineering, Brisbane, QLD 4072 Australia;5. City West Water, Melbourne, VIC 3020, Australia;1. Department of Earth and Environmental Engineering, Columbia University, New York, NY, United States;2. Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA, United States |
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| Abstract: | The dusty gas model (DGM) is used to describe transport of binary gas mixtures through porous membrane supports to quantify the resistance towards permeation. The model equations account for three different transport mechanisms for the permeating components: conventional viscous pore flow, Knudsen diffusion, and binary diffusion. Experimental data obtained with the uncoated membrane supports are used to determine the morphological parameters needed in the DGM equations. Flat sheet and hollow fiber membrane supports are characterized by the permeation of a TCE/nitrogen vapor. The DGM shows an excellent fit to experimental data when the asymmetric structure of the membrane supports is taken into account, but the morphological parameters cannot necessarily be related to precise physical structure parameters such as pore size, porosity, and tortuosity. The DGM works well even when the membrane supports are modeled as a single homogenous structure. The membrane supports exhibit different resistances towards the various transport mechanisms that occur within the porous support and the resistances vary with process conditions so that support optimization is not straightforward. With the analysis presented in this paper and transport equations specific to the dense coating and module geometries, the influence of the support layer on gas or vapor separation can be quantified. |
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