Pervaporation of water-ethanol mixtures through symmetric and asymmetric TPX membranes |
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| Institution: | 1. European Commission, Joint Research Centre, P.O. Box 2340, 76125, Karlsruhe, Germany;2. Politecnico di Milano, Department of Energy, Via La Masa 34, 20156, Milan, Italy;3. Delft University of Technology, Department of Radiation Science & Technology, Mekelweg 15 2629 Delft, Netherlands;1. Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, USA;2. G.W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, USA;3. Department of Polymer Engineering and Technology, University of the Punjab, Lahore, 54590, Pakistan;4. Department of Mechanical Engineering, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia;5. Institute of Chemical Engineering and Technology (ICET), University of the Punjab, Lahore, 54590, Pakistan;6. Faculty of Engineering and Technology, University of the Punjab, Lahore, 54590 Pakistan |
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| Abstract: | In this work, the pervaporation performance and mechanism of water-ethanol mixtures through symmetric and asymmetric TPX poly(4-methyl-1-pentene)] membranes were investigated. The results show that TPX is a highly water permselective material although it is strongly hydrophobic. It was found that, for a symmetric dense TPX membrane, the feed solution vaporizes first and then permeates through the membrane. The water selectivity stems from the huge difference in diffusivity between water and ethanol vapors. To improve the permeation flux, asymmetric TPX membranes were prepared by a wet inversion method. However, due to the swelling effect of ethanol on TPX, small pores occur when the dense skin contacts the feed solution, resulting in a loss of water selectivity. Stain experiments were carried out to verify this mechanism. In addition, it was found that a parallel model can describe the mechanism quite accurately. Good agreement between the theoretical calculation and experimental measurement has been obtained. Furthermore, we also found that the loss of selectivity can be avoided by turning the asymmetric membrane over; that is, let the dense skin face the permeate. |
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