transient permeation-based method for composite zeolite membranes characterization

An in situ nondestructive characterization method for zeolite composite membranes, based on transient permeation experiments, is proposed in the present article. This technique allows an accurate evaluation of the zeolite selective layer thickness as well as the thermodynamic and transport propertie...

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Bibliographic Details
Published in:AIChE journal 2008-10, Vol.54 (10), p.2527-2538
Main Authors: Courthial, L, Baudot, A, Tayakout-Fayolle, M, Jallut, C
Format: Article
Language:English
Subjects:
Adsorption
Applied sciences
Chemical and Process Engineering
Chemical engineering
Chemical Sciences
Composite materials
dynamic modeling
Engineering Sciences
Estimating techniques
Exact sciences and technology
Heat and mass transfer. Packings, plates
Hydrocarbons
mass transfer
membrane
Membranes
Minerals
Thermodynamics
transient techniques
zeolite
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Summary:An in situ nondestructive characterization method for zeolite composite membranes, based on transient permeation experiments, is proposed in the present article. This technique allows an accurate evaluation of the zeolite selective layer thickness as well as the thermodynamic and transport properties of sorbing hydrocarbons. To this end, a dynamic model representing mass transport phenomena within the whole permeating module is derived. In order to get the crystal layer properties, a two-step experimental approach is required. The zeolite layer effective thickness is first estimated with the permeation of a nonadsorbing species like hydrogen. Then, the adsorption equilibrium constants and the diffusion coefficients of butane isomers are determined. Three membranes obtained by different synthesis procedures are studied in the Henry domain. The estimated values of the equilibrium constants and diffusion coefficients for normal butane and isobutane are favorably compared with existing literature data. © 2008 American Institute of Chemical Engineers AIChE J, 2008
ISSN:0001-1541
1547-5905
DOI:10.1002/aic.11580