Separation and purification of isobutanol from dilute aqueous solutions by a hybrid hydrophobic/hydrophilic pervaporation process |
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| Affiliation: | 1. Department of Chemical Engineering, Amirkabir University of Technology (TehranPolytechnic), Hafez Ave., P.O. Box 15875-4413, Tehran, Iran;2. Food Process Engineering and Biotechnology Research Center, Amirkabir University of Technology (Tehran Polytechnic), Hafez Ave., P.O. Box 15875-4413, Tehran, Iran;1. Nicolaus Copernicus University in Toruń, Faculty of Chemistry, 7 Gagarina Street, 87-100 Toruń, Poland;2. Wroclaw University of Technology, Chemical Faculty, 27 Wybrzeże Stanisława Wyspiańskiego, 50-370 Wrocław, Poland;1. State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China;2. University of Chinese Academy of Sciences, Beijing 100049, PR China;3. College of Biology Science & Engineering, Hebei University of Economics & Business, Shijiazhuang 050061, PR China;1. Department of Chemical Thermodynamics and Kinetics, St. Petersburg State University, Universitetsky pr. 26, Peterhof, St. Petersburg 198504, Russia;2. St. Petersburg National Research University of Information Technologies, Mechanics and Optics, Kronverkskiy pr. 49, St. Petersburg 197101, Russia;3. Faculty of Physics, St. Petersburg State University, Ulyanovskaya Str. 1, Peterhof, St. Petersburg 198504, Russia |
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| Abstract: | In this study, a hybrid hydrophobic/hydrophilic pervaporation process was employed to separate and purify isobutanol from its dilute aqueous solutions. For this purpose, composite polydimethylsiloxane membranes were initially used for the recovery of isobutanol by hydrophobic pervaporation. Then the hydrophilic pervaporation with a composite polyvinyl alcohol membrane was utilized to separate water from the organic phase of the permeate stream of the hydrophobic pervaporation. The effect of feed flow rate on the performance of pervaporation was investigated. The resistance in series model was also applied to calculate the transport resistances through the composite membranes. It was observed that an enhancement in the feed flow rate led to higher permeation flux and selectivity of the more permeable component, while the flux of the less permeable component was almost constant. Also, the ratio of liquid boundary layer resistance to membrane layer resistance decreased by an increase in the feed flow rate. The isobutanol with a purity of higher than 99 wt.% was produced by the hybrid hydrophobic/hydrophilic pervaporation technique from a 2 wt.% aqueous isobutanol solution. |
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| Keywords: | Pervaporation Isobutanol Hybrid process Composite membranes PDMS PVA |
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