Theory of gas diffusion and permeation in inorganic molecular-sieve membranes

Theoretical models of gas diffusion and permeation in microporous molecularsieve membranes are presented. The effect of the adsorbed diffusant on the total transmembrane flow is insignificant for permanent gases. For highly adsorbable gases the effect of the adsorbed molecules on the total transmemb...

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Bibliographic Details
Published in:AIChE journal 1995-01, Vol.41 (1), p.58-67
Main Authors: Shelekhin, A. B., Dixon, A. G., Ma, Y. H.
Format: Article
Language:English
Subjects:
ADSORBENTS
ADSORPTION
ELEMENTS
FLUIDS
GASES
HELIUM
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
MATHEMATICAL MODELS
MEMBRANE TRANSPORT
MICROSTRUCTURE
MOLECULAR SIEVES
NONMETALS
PERMEABILITY
PORE STRUCTURE
RARE GASES
SEPARATION PROCESSES
SORPTION 400105 > Separation Procedures
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Summary:Theoretical models of gas diffusion and permeation in microporous molecularsieve membranes are presented. The effect of the adsorbed diffusant on the total transmembrane flow is insignificant for permanent gases. For highly adsorbable gases the effect of the adsorbed molecules on the total transmembrane flux may be high at low temperatures. The activation energy of diffusion increases when the kinetic diameter of the diffusant increases. The activation energy of gas diffusion compares well with the values calculated based on the Lennard‐Jones potential. Maximum possible permeability coefficients calculated for He in the molecular‐sieve membranes do not exceed ˜30,000 Barrer at room temperature. The experimentally observed value for He permeability is ˜1,000 Barrer (T=30°C) because of the high tortuosity (τ≈︁ 25) and low porosity (θ = 0.22) of the membrane porous structure.
ISSN:0001-1541
1547-5905
DOI:10.1002/aic.690410107