Mechanism of Gas Permeation through Porous Polymeric Membrane

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  • NOHMI Takashi
    Textile Research Laboratory, Asahi Chemical Industry Co., Ltd.
  • MAKINO Hiroyuki
    Department of Polymer Technology, Tokyo Institute of Technology
  • MANABE Sei-ichi
    Textile Research Laboratory, Asahi Chemical Industry Co., Ltd.
  • KAMIDE Kenji
    Textile Research Laboratory, Asahi Chemical Industry Co., Ltd.
  • KAWAI Toru
    Department of Polymer Technology, Tokyo Institute of Technology

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Other Title
  • 多孔性高分子膜の透過性　ＩＩＩ　　高分子多孔膜中の気体透過機構
  • コウブンシ タコウ マク チュウ ノ キタイ トウカ キコウ タコウセイ コウ

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Abstract

For the purpose of disclosing the mechanism of gas permeation through porous polymeric membrane, the effects of the pore size distribution N (r) and the chemical nature of permeating gas on the gas permeability coefficient P (P1, P2) (P1 and P2 are pressure of both sides of the membrane, P1≥P2) of cylindrically straight through porous membrane having average pore size (2r1) of 0.75-0.035μm were studied. Gas flow through a capillary (radius r) consists of the free molecular (F) flow only in the case of 2r≤λ (λ: mean free path of the gas) and can be approximated with a mixed flow of viscous and slip flow (V flow) for 2r>λ. The experimental P (P1, P2) value is in excellent agreement with the theoretical one calculated by assuming that, in the range P2≤P0<P1 (P0, pressure at which 2r=λ is realized), V flow occurs at the inlet and F flow dominates near the outlet of the capillary. The dependence of P (P1, P2) of inorganic gases on P1, P2, N (r) and λ can be expressed by a theoretical equation proposed in this Journal, 34, 729 (1977). The experimental P (P1, P2) values of membrane (2r1=0.035μm) for organic gases under the conditions that F flow occurs exclusively, are much larger than the theoretical value. The difference increases with an increase in boiling temperature of the gas, suggesting strongly that the gas flow relating to interaction between membrane and gas (for example, surface diffusion) contributes to P (P1, P2) significantly.

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 35 (4), 253-261, 1978

    The Society of Polymer Science, Japan

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