A Consideration of Pervaporation by Porous Hydrophobic Membranes for Dilute Ethanol Solution

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The pervaporation (PV) of an aqueous solution by a porous hydrophobic membrane is considered as simple distillation in a membrane pore. It's separation factor (<I>α</I>) is generally smaller than the equilibrium one (<I>α</I><SUB>eq</SUB>) by simple distillation, but we obtained larger separation factors than the equilibrium one under limited experimental conditions in the previous work. In order to investigate this phenomena, we carried out adhesion experiments using two types of membranes, hydrophobic and hydrophilic membranes. Hydrophobic membranes exhibited ethanol-selective adsorption properties. With the results of the adhesion experiments, we rearranged the previous data and obtained the following results. In the case that the downstream (permeate side) pressure <I>P</I><SUB>2</SUB> was small enough and close to vacuum, PV was controlled by simple distillation. Permeate flux (<I>J</I><SUB>T</SUB>) was proportional to (<I>P</I>* – <I>P</I><SUB>2</SUB>) and <I>α</I> was smaller than <I>α</I><SUB>eq</SUB>. In the case that <I>P</I><SUB>2</SUB> became large and was close to the saturated pressure <I>P</I>*, PV performance was significantly affected by the hydrophobicity of the membrane. <I>J</I><SUB>T</SUB> was small and <I>α</I> became large and exceeded <I>α</I><SUB>eq</SUB> because the contact time of solution with hydrophobic membrane became long and the concentration near the surface on the membrane increased by the selective ethanol adsorption properties on the hydrophobic membrane.

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  • Journal of chemical engineering of Japan  

    Journal of chemical engineering of Japan 31(1), 153-156, 1998-02 

    The Society of Chemical Engineers, Japan

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各種コード

  • NII論文ID(NAID)
    10002065071
  • NII書誌ID(NCID)
    AA00709658
  • 本文言語コード
    ENG
  • 資料種別
    SHO
  • ISSN
    00219592
  • NDL 記事登録ID
    4427719
  • NDL 雑誌分類
    ZP1(科学技術--化学・化学工業)
  • NDL 請求記号
    Z53-R395
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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