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    Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/116207

    Title: Preparation of particulate polyvinylidene fluoride membranes of different particle sizes for membrane distillation applications
    Authors: Cheng-Dau Yang;Hsu-Hsien Chang;Liao-Ping Cheng
    Keywords: membrane distillation;particulate;polyvinylidene fluoride (PVDF);porous membrane
    Date: 2018-12-07
    Issue Date: 2019-04-10 12:10:40 (UTC+8)
    Abstract: Microporous polyvinylidene fluoride (PVDF) membranes were prepared by immersion precipitation of dimethylformamide/PVDF solutions, dissolved at 50°C, 60°C, 70°C, and 80°C in a nonsolvent bath. The formed membranes (M50, M60, M70, and M80) exhibited symmetric structures consisting of spherical particles whose size increased from ~1 μm for M50 to ~3 μm for M80. The desalination capabilities of the membranes were assessed via the direct contact membrane distillation process. For the case of desalting 3.5% NaCl(aq), very high rejection ratios (>99.7%) were achieved for all tested membranes under the operation conditions: Thot stream=52°C, Tcold stream=18°C, circulation rate=0.7 l/min, while the highest permeation flux obtainable was 16.3 l/m2h (LMH). When the feed temperature or circulation rate was raised, the permeation flux increased correspondingly. On the other hand, raising the salt concentration resulted in a strong decrease of the permeation flux. For the membrane M60 operated over the period of 48 h, the flux decreased slightly from 11.6 to 10.5 LMH, while the conductivity increased from 1.5 to 27 μs/cm indicating the occurrence of slight surface wetting during this extended operation period.
    Relation: Journal of Polymer Engineering 39(3), p.254–263
    DOI: 10.1515/polyeng-2018-0181
    Appears in Collections:[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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