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    題名: 溶質與薄膜性質對平板掃流超過濾之影響
    其他題名: Effects of Solutes and Membrane Property on Cross-flow Ultrafiltration in Flat-Sheet Module
    作者: 鄭東文;Cheng, Tung-wen;周欣霈;Chou, Hsin-pei
    貢獻者: 淡江大學化學工程與材料工程學系
    關鍵詞: 掃流超過濾;薄膜性質;蛋白質;Cross-flow Ultrafiltration;Membrane Property;Protein
    日期: 2008
    上傳時間: 2012-12-03 23:29:40 (UTC+8)
    出版者: 臺北市:行政院國家科學委員會
    摘要: 本研究是在平板掃流式超過濾率統進行實驗,探
    討不同溶質(BSA 、Dextran T70 、B-cyclodextrin) 溶液與
    不同親疏水性薄膜(PES膜、RCA膜) ,在不同操作參數
    (液體速度、pH 值、透膜壓差)下,對濾速、阻隔率、阻
    力以及雙溶質溶液分離效率之影響。當溶液與過濾薄膜
    之親疏水性質相異時,則粒子與膜面有一排斥作用力存
    在。RCA 膜過濾BSA 溶液時,溶質不易在膜面上形成
    結垢,因此濾速較高。此時增加掃流速度,對濾速的提
    升較為有限。當溶液之pH 值遠離等電點,不僅粒子與
    膜面有排斥力外,粒子與粒子問皆有排斥力,導致結垢
    層較薄較鬆散,濾速較高。在BSA 與B-cyclodextrin 雙
    溶質溶液中,其濾速較純BSA 溶液來得低,此因部份
    B-cyclodextrin 進入薄膜孔道形成內部結垢所致,尤其是
    在RCA 膜更為明顯。當在PES膜其中,大分子BSA溶質
    之親疏水性與薄膜一致時,小分子ß-cyclodextrin 的穿
    透率會隨著壓力增加而下降,也造成分離效率的降低。In this study, polymer membranes were
    employed in a cross-flow ultrafiltration system to
    investigate the effects of solution compositions and
    membrane properties on filtration. The solution fluxes,
    solute rejections, filtration resistances and separation
    selectivity were discussed under various operating
    parameters such as liquid velocity, pH value and
    transmembrane pressure. The difference in the hydrophobicity between the feed solution and membrane
    generates an exclusion force. Such as the case of filtration
    of BSA solution by the RCA membrane, a high permeate
    flux is achieved due to the solute hard formation of fouling
    layer on the membrane surface. When the pH value is far
    away the BSA isoelectric point, the porosity of BSA
    deposited layer is high due to exclusion between the BSA
    molecules and results in high flux. In the binary solutes
    system, cause by the internal fouling of cyclodextrin, the
    flux of solution containing cyclodextrin is lower than
    that of pure BSA solution. On the other, BSA molecules
    have strong fouling propensity to PES membrane, the
    transmission of cyclodextrin is lowered due to the
    compact BSA deposited layer and becomes lower as the
    applied pressure increases that will reduce the separation
    selectivity.
    關聯: 2008年輸送現象及其應用研討會論文摘要集 ( 2008 Symposium of transport phenomena and applications abstract book)
    顯示於類別:[化學工程與材料工程學系暨研究所] 會議論文

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