Pervaporation separation of water/isopropanol mixtures through crosslinked carboxymethyl chitosan/polysulfone hollow‐fiber composite membranes |
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| Authors: | Jiang‐nan Shen Li‐guang Wu Jun‐hong Qiu Cong‐jie Gao |
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| Affiliation: | 1. College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310027, People's Republic of China;2. National Engineering Research Center for Liquid Separation Membrane, Hangzhou 310012, People's Republic of China |
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| Abstract: | Carboxymethyl chitosan (CMCS)/polysulfone (PS) hollow‐fiber composite membranes were prepared through glutaraldehyde (GA) as the crosslinking agent and PS hollow‐fiber ultrafiltration membrane as the support. The permeation and separation characteristics for dehydration of isopropanol were investigated by the pervaporation method. Pure chitosan, carboxymethyl chitosan, and crosslinked carboxymethyl chitosan membranes were characterized by Fourier transform infrared (FT‐IR) spectroscopy and X‐ray diffraction (XRD) to study the crosslinking reaction mechanism and degree of crystallinity, respectively. The effects of feed composition, crosslinking agent, membrane thickness, and feed temperature on membrane performance were investigated. The results show that the crosslinked CMCS/PS hollow‐fiber composite membranes possess high selectivity and promising permeability. The permeation flux and separation factor for isopropanol/water is 38.6 g/m2h and 3238.5, using 87.5 wt % isopropanol concentration at 45°C, respectively. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 1959–1965, 2007 |
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| Keywords: | pervaporation water/isopropanol mixtures carboxymethyl chitosan membrane crosslinking |
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