Modelling mass transport through a porous partition: Effect of pore size distribution
-
Mohamed Khayet
Abstract
Direct contact membrane distillation process has been studied using microporous polytetrafluoroethylene and polyvinylidene fluoride membranes. The membranes were characterized in terms of their non-wettability, pore size distribution and porosity. The mean pore sizes and pore size distributions were obtained by means of wet/dry flow method. The mean pore size and the effective porosity of the membranes were also determined from the gas permeation test. A theoretical model that considers the pore size distribution together with the gas transport mechanisms through the membrane pores was developed for this process. The contribution of each mass transport mechanism was analyzed. It was found that both membranes have pore size distributions in the Knudsen region and in the transition between Knudsen and ordinary diffusion region. The transition region was the major contribution to mass transport. The predicted water vapor permeability of the membranes were compared with the experimental ones. The effect of considering pore size distribution instead of mean pore size to predict the water vapor permeability of the membranes was investigated.
References
1 Lawson, K.W., Lloyd, D.R., Review: Membrane Distillation, J. Membr. Sci., 124 (1997) 1.10.1016/S0376-7388(96)00236-0Suche in Google Scholar
2 Khayet, M., Godino, M.P., Mengual, J.I., Nature of Flow on Sweeping Gas Membrane Distillation, J. Membr. Sci., 170 (2000) 243.Suche in Google Scholar
3 Bandini, S., Saavedra, A., Sarti, G.C., Vacuum Membrane Distillation: Experiments and Modeling, AIChE J., 43-2 (1997) 398.Suche in Google Scholar
4 Izquierdo-Gil, M.A., García-Payo, M.C., Fernández-Pineda, C., Air Gap Membrane Distillation for Sucrose Aqueous Solutions, J. Membr. Sci., 155 (1999) 291.Suche in Google Scholar
5 Khayet, M., Godino, M.P., Mengual, J.I., Modelling Transport Mechanism Through a Porous Partition, J. Non-Equilb. Thermodyn., 26 (2001) 1.Suche in Google Scholar
6 Laganà, F., Barbieri, G., Drioli, E., Direct Contact Membrane Distillation: Modelling and Concentration Experiments, J. Membr. Sci., 166 (2000) 1.10.1016/S0376-7388(99)00234-3Suche in Google Scholar
7 Phattaranawik, J., Jiraratananon, R., Fane, A.G., Effect of Pore Size Distribution and Air flux on Mass Transport in Direct Contact Membrane Distillation, J. Membr. Sci., 215 (2003) 75.Suche in Google Scholar
8 Khayet, M., Matsuura, T., Preparation and Characterization of Polyvinylidene Fluoride Membranes for Membrane Distillation, Ind. Eng. Chem. Res., 40 (2001) 5710.Suche in Google Scholar
9 Kesting, R.E., Synthetic Polymeric Membranes, 2nd edition, John Wiley & Sons, New York, 1985.Suche in Google Scholar
10 Khayet, M., Feng, C.Y., Matsuura, T., Morphological Study of Fluorinated Asymmetric Polyetherimide Ultrafiltration Membranes by Surface Modifying Macromolecules, J. Membr. Sci., 213 (2003) 159.Suche in Google Scholar
11 Kast, W., Hohenthanner, C.R., Mass Transfer Within the Gas Phase of Porous Media, Int. J. Heat & Mass Transfer, 43 (2000) 807.10.1016/S0017-9310(99)00158-1Suche in Google Scholar
12 Matsuura, T., Synthetic Membranes and Membrane Separation Processes, CRC Press, Boca Raton, FL, 1993.Suche in Google Scholar
13 Schofield, R.W., Fane, A.G., Fell, C.J.D., Heat and Mass Transfer in Membrane Distillation, J. Membr. Sci., 33 (1987) 299.Suche in Google Scholar
14 Mengual, J.I., Peña, L., Membrane Distillation, Colloid & Interface Sci., 1 (1997) 17.Suche in Google Scholar
15 Perry, J.H., Chemical Engineers Handbook, 4th edition, McGraw Hill, New York, 1963.Suche in Google Scholar
16 Speraty, C.A., Physical Constants of Fluoropolymers, Polymer Handbook, 3rd edition, Wiley, New York, 1989.Suche in Google Scholar
© Walter de Gruyter
Artikel in diesem Heft
- Gerard A. Maugin, 60 years young
- Non-linear phenomena in thermoacoustic engines
- Entropy production in polarizable bodies with internal variables
- Thermodynamic interaction between two discrete systems in non-equilibrium
- Inconsistency in the Moment’s method for solving the Boltzmann equation
- Modelling mass transport through a porous partition: Effect of pore size distribution
- Time scales for energy transfer
Artikel in diesem Heft
- Gerard A. Maugin, 60 years young
- Non-linear phenomena in thermoacoustic engines
- Entropy production in polarizable bodies with internal variables
- Thermodynamic interaction between two discrete systems in non-equilibrium
- Inconsistency in the Moment’s method for solving the Boltzmann equation
- Modelling mass transport through a porous partition: Effect of pore size distribution
- Time scales for energy transfer
