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Measurement of concentration-dependent gas diffusion coefficients in membranes from a psuedo-steady state permeation run

Villet, Michael C. and Gavalas, George R. (2007) Measurement of concentration-dependent gas diffusion coefficients in membranes from a psuedo-steady state permeation run. Journal of Membrane Science, 297 (1-2). pp. 199-205. ISSN 0376-7388. https://resolver.caltech.edu/CaltechAUTHORS:20151006-150210067

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Abstract

Transient permeation measurements were conducted for carbon dioxide through a PDMS membrane and for carbon dioxide and methane through a ZSM-5 zeolite membrane. After pressurization the feed tank was shut off from the supply and pressure and flux measurements were conducted while the feed-side pressure gradually declined over the course of each run. A series of steady state runs were also conducted for the same range of feed-side pressures. In all runs the transient fluxes were close to the steady state fluxes at corresponding feed-side pressures indicating that the transient evolved at a pseudo-steady state. A dimensionless parameter depending on the feed tank volume, membrane geometry, and adsorption properties was defined to characterize the deviation from steady state. Concentration-dependent diffusion coefficients were estimated from (i) steady state fluxes from a sequence of runs, (ii) transient fluxes from a single run, and (iii) transient pressure measurements from a single run. The fluxes and the diffusion coefficients obtained from a single transient run, and from a sequence of steady state runs are compared and the observed differences are discussed.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.memsci.2007.03.045DOIArticle
http://www.sciencedirect.com/science/article/pii/S0376738807002116PublisherArticle
ORCID:
AuthorORCID
Gavalas, George R.0000-0003-1468-6835
Additional Information:© 2007 Elsevier. Received 10 January 2007; received in revised form 20 March 2007; accepted 24 March 2007; Available online 1 April 2007. Support by NSF grant CTS-0084155 is gratefully acknowledged.
Funders:
Funding AgencyGrant Number
NSFCTS-0084155
Subject Keywords:Membrane diffusion coefficients; Transient measurements
Issue or Number:1-2
Record Number:CaltechAUTHORS:20151006-150210067
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20151006-150210067
Official Citation:Michael C. Villet, George R. Gavalas, Measurement of concentration-dependent gas diffusion coefficients in membranes from a psuedo-steady state permeation run, Journal of Membrane Science, Volume 297, Issues 1–2, 5 July 2007, Pages 199-205, ISSN 0376-7388, http://dx.doi.org/10.1016/j.memsci.2007.03.045. (http://www.sciencedirect.com/science/article/pii/S0376738807002116)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:60816
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:07 Oct 2015 14:09
Last Modified:03 Oct 2019 09:01

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