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Dehydration of water-alcohol mixtures by pervaporation and vapor permeation through surface resintering expanded poly(tetrafluoroethylene) membranes
Authors:James Huang  Yi-Chieh WangChi-Lan Li  Kueir-Rarn LeeShu-Chin Fan  Tian-Tsair WuJuin-Yih Lai
Institution:a Department of Chemistry, Chung Yuan University, Chung-Li 32023, Taiwan, ROC
b Department of Chemical Engineering, Nanya Institute of Technology, Chung-Li 32034, Taiwan, ROC
c Membrane Research Laboratory, Department of Chemical Engineering, Chung Yuan University, Chung-Li 32023, Taiwan, ROC
Abstract:For the purpose of separating aqueous alcohol mixtures by the use of the pervaporation and vapor permeation techniques, a surface resintering expanded poly(tetrafluoroethylene) (e-PTFE), membrane was investigated. The surface properties of the modified e-PTFE membranes were characterized by atomic force microscopy, scanning electron microscopy, and contact angle meter. The X-ray diffraction measurements show that the crystallinity of the e-PTFE membrane decreases with increasing the surface resintering temperature. The surface roughness decreases with the surface resintering temperature increases. The membrane exhibited water selectivity during all process runs. The effects of feed composition, surface resintering temperature, and molar volume of the alcohols on pervaporation and vapor permeation were investigated. Compared with the e-PTFE membrane without surface modified, the e-PTFE membrane with surface resintering treatment effectively improve the separation factor for pervaporation of aqueous alcohol mixtures. The separation performances of e-PTFE membranes in vapor permeation are higher than that in pervaporation.
Keywords:Expanded poly(tetrafluoroethylene)  Surface resintering  Pervaporation  Vapor permeation
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