Crosslinked chitosan composite membrane for the pervaporation dehydration of alcohol mixtures and enhancement of structural stability of chitosan/polysulfone composite membranes |
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| Affiliation: | 1. Singapore Membrane Technology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, Singapore 637141, Singapore;2. School of Civil and Environmental Engineering, Nanyang Technological University, Singapore 639798, Singapore;1. Key Laboratory of Microsystems and Microstructures Manufacturing, Ministry of Education, Micro/Nano Technology Research Centre, Harbin Institute of Technology, Yikuang Street 2, Harbin 150080, China;2. Queen Mary University of London, Mile End, Eng, 215, London E1 4NS, United Kingdom;3. Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, Universite Claude Bernard Lyon 1, 43 boulevard du 11 Novembre 1918 F-69622 Villeurbanne cedex, France;1. Department of Chemical Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran;2. Department of Chemistry, Isfahan University of Technology, Isfahan, 84156-83111, Iran;3. Faculty of Physical Sciences and Engineering, University of Southampton, Southampton, SO17 1BJ, UK;4. Catalysis and Nanotechnology Research, Division, Research Institute of Petroleum Industry (RIPI), Tehran, P.O. Box 14665-137, Iran |
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| Abstract: | Chitosan composite membranes having a microporous polysulfone substrate were prepared and tested for the pervaporation dehydration of aqueous isopropanol mixtures. When the composite membrane experienced excessive swelling at the feed mixture of high water content, the composite membranes were found to be segregated in structure due to the opposite characteristics to water of chitosan and polysulfone. Efforts to enhance the structural stability under various pervaporation operational conditions were made. The polysulfone substrate was immersed into hydrophilic binding polymer solutions such as polyvinyl alcohol, polyacrylic acid, and hydroxyethylcellulose before the casting of chitosan layer to increase the affinity between the thin chitosan layer and porous polysulfone layer which resulted in increased geometrical stability of the chitosan/polysulfone composite membranes. The chitosan layer was crosslinked with glutaraldehyde and H2SO4 in acetone solution to control the permselectivity. |
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