A model for gas permeation using mixed matrix membranes IN temperature and pressure different
Paper ID : 1231-MST2015-FULL
Authors:
Ali Izadiar *1, mostafa moraveji2, mahdi salehi asl3
1Department of Chemical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Hafez Ave., P.O. Box 15875-4413, Tehran, Iran.
2Faculty member
3Department of Chemical Engineering,Iran University of Science and Technology (IUST) , Narmak , Tehran, Iran
Abstract:
Our purpose in this study was to present a model to predict gas permeability through mixed matrix membrane based on solubility-diffusion mechanism in different operating conditions..To predict the gas permeability we have used computational fluid dynamics techniques (CFD) by simultaneous solving of transfer equations using modified Fick’s law and the theory of free volume. The CFD model was presented with 4 different ways to achieve diffusion coefficient through the membrane. Case 1: achieving diffusion coefficient using by free volume theory. Case 2: achieving diffusion coefficient using by predictive mathematical models, case 3: achieving temperature-dependent diffusion coefficient using by Fujita method, case 4: achieving diffusion coefficient using by Wesselingh method .To predict the absorption coefficient we have used the non-equilibrium lattice fluid (NELF) which is used for amorphous phase in temperatures higher than polymer glassy temperature and is valid by glass membranes non-equilibrium states .Obtained results from prediction of gas absorption on the polyether sulfone membrane using NELF model had a good agreement with the values reported in the literature. Finally, a comparison of the CFD model results by using our experimental data was presented and the impact of the temperature and pressure on the gas permeability and membrane selectivity was investigated.
Keywords:
mixed matrix membrane , solubility-diffusion , absorption , diffusion , free volume theory , fujita , computational fluid dynamics.
Status : Paper Accepted (Poster Presentation)