Interlayer resistance of bilayer membrane to gas permeation

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Abstract

To describe gas transfer through a bilayer membrane with a thin selective layer on the surface of a highly permeable gutter layer, it was first proposed to take into account the interlayer resistance arising at the boundary of this membrane layers and a model of gas transfer through a bilayer membrane was developed. An analytical expressions for permeability and selectivity of such a membrane taking into account this resistance is obtained. It is shown that the interlayer resistance can noticeably affect the transport characteristics of the membrane. It is found that even in the case of small diffusion resistance to gas permeation of the gutter layer, its sorption and kinetic parameters influence the permeability and selectivity of the membrane as a whole.

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About the authors

V. V. Ugrozov

Financial University under the Government of the Russian Federation

Author for correspondence.
Email: vugr@rambler.ru
Russian Federation, 125993, Moscow, Leningradsky pr., 49

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2. Fig. 1. a – schematic representation of a bilayer membrane. 1 – selective layer, 2 – intermediate layer, 3 – boundary between membrane layers. b – “series resistance” model taking into account interlayer resistance.

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3. Fig. 2. Mechanism of occurrence of interlayer resistance at the boundary of two membrane layers. 1 – selective layer, 2 – intermediate layer, 3 – boundary between membrane layers.

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4. Fig. 3. Dependence of the resistance of a bilayer membrane on the thickness of the selective layer in the case where the diffusion resistance of the intermediate layer is significantly less than the resistance of the selective layer ()

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5. Fig. 4. Dependence of the ideal selectivity coefficient of a bilayer membrane on the interlayer resistances of gases A and B.

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