Enhanced anti-swelling property and dehumidification performance by sodium alginate-poly(vinyl alcohol)/polysulfone composite hollow fiber membranes

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• 作者：Yifan Li ; Huiping Jia ; Fusheng Pan ; Zhongyi Jiang ; ^{zhyjiang@tju.edu.cn} ; Qinglai Cheng
• 关键词：Blend membrane ; Sodium alginate ; Poly(vinyl alcohol) ; Propylene ; Dehumidification
• 刊名：Journal of Membrane Science
• 出版年：2012
• 出版时间：15 July, 2012
• 年：2012
• 卷：407-408
• 期：Complete
• 页码：211-220
• 全文大小：979 K

文摘

Enhanced membrane dehumidification performance was achieved by physically blending sodium alginate (NaAlg) with poly(vinyl alcohol) (PVA). Both flat-sheet homogenous membranes and hollow-fiber composite membranes were prepared and characterized by Fourier transform infrared spectra (FT-IR), X-ray diffraction (XRD), differential scanning calorimetry (DSC), positron annihilation lifetime spectroscopy (PALS). When PVA content was 20 wt. % and 30 wt. % , the blend membranes exhibited lower swelling degree and much higher water/propylene selectivity than both NaAlg and PVA control membranes, resulting from the better-controlled free volume cavity size. In particular, the blend membrane containing 20 wt. % PVA showed the best dehumidification performance for propylene-water mixture. Both high water permeance (>10^? cm³(STP)/cm² s cmHg) and high selectivity (infinite big) were acquired for 0.13 wt. % water in feed under optimized operating conditions (temperature: 298 K; feed pressure: 250 kPa; feed flowrate: ?00 ml/min).