Theory of gas diffusion and permeation in inorganic molecular-sieve membranes
- Worcester Polytechnic Inst., MA (United States). Chemical Engineering Dept.
Theoretical models of gas diffusion and permeation in microporous molecular-sieve 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 [approximately] 30,000 Barrer at room temperature. The experimentally observed value for He permeability is [approximately] 1,000 Barrer (T = 30 C) because of the high tortuosity ([tau] [approx] 25) and low porosity ([theta] = 0.22) of the membrane porous structure.
- DOE Contract Number:
- AC21-89MC26372
- OSTI ID:
- 6800358
- Journal Information:
- AIChE Journal (American Institute of Chemical Engineers); (United States), Journal Name: AIChE Journal (American Institute of Chemical Engineers); (United States) Vol. 41:1; ISSN 0001-1541; ISSN AICEAC
- Country of Publication:
- United States
- Language:
- English
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