イオン交膜面付着物層内における濃度分極  [in Japanese] Concentration Polarization in the Substance Layer Attached to an Ion Exchange Membrane  [in Japanese]

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Author(s)

Abstract

In order to prevent fouling of ion exchange membranes, the ionic transport and concentration polarization in the substance layer attached to the membrane surface was analyzed in an NaCl solution using the extended Nernst-Planck equation. The ionic diffusion coefficient in a non-infinitely diluted region withn the layer was obtained ushlg the diffusion coefficient equation taken from the Nernst-Einstein equation, and the same coefficient in an infinitely diluted region was expressed using the values in the infinitely diuted region. When the NaCl concentration in the substance layer is increased in the non-infinitely diluted region, the ionic concentration change is expressed linearly. This is because the effbct of convection on the ionic transport is neghgible. When the NaCl concentration is reduced in the non-infinitely diluted region, the ionic concentration is expressed by a curved line and the concentration polarization is moderated to some extent. This is because of the increase in the ionic diffusion codfficient in the low NaCl concentration. In the infinitely diluted region, the ionic diffhsion coefficient being co nstant, the concentration polarization is promoted by the sharp linear decrease of the NaCl concentration neaf the membrane surface. Accordingly, the possibility of trouble occurrhlg, such as water dissociation, increases as a result of the formation of the infinitely diluted region. The concentration polarization is promoted in the substance Iayer because the convection is less and the effect of the 3rd term (convection term) in the extended Nernst-Planck equation decreases. The convection in the layeroccur only as a result of the electro-osmotic flow and convection diffbrence osmotic flow in the membranes. It is important to remove the substance layer attached to the membrane surface in the electrodialysis, because of the cel voltage increase Qwing to the promotion of concentration polarization.

Journal

  • Bulletin of the Society of Sea Water Science, Japan

    Bulletin of the Society of Sea Water Science, Japan 51(4), 228-236, 1997-09-01

    The Society of Sea Water Science, Japan

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Codes

  • NII Article ID (NAID)
    10008280993
  • NII NACSIS-CAT ID (NCID)
    AN0018645X
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    03694550
  • NDL Article ID
    4292551
  • NDL Source Classification
    ZM44(科学技術--地球科学--海洋・陸水・火山) // ZP8(科学技術--化学・化学工業--無機化学・無機化学工業)
  • NDL Call No.
    Z15-47
  • Data Source
    CJP  CJPref  NDL  J-STAGE 
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