The Maxwell-Stefan description of mass transport across zeolite membranes

Krishna, R. ; van den Broeke, L. J. P. (1995) The Maxwell-Stefan description of mass transport across zeolite membranes The Chemical Engineering Journal and the Biochemical Engineering Journal, 57 (2). pp. 155-162. ISSN 0923-0467

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Published experimental data on transient permeation fluxes of light hydrocarbons through a silicalite-1 membrane show curious behaviour. For a mixture of methane and n-butane, for example, the transient experiments showed that initially the permeation flux of methane is higher than for n-butane but that this methane flux reduces to a lower steady state value. The n-butane flux is initially low but under steady state conditions is much higher than that for methane. A mathematical model for transient membrane mass transport has been developed using the Maxwell - Stefan formulation. This model is able to predict the observed maximum in the flux of methane, and if we assume that the Fick diffusivity is constant the transient permeation fluxes are predicted to reach their steady state values monotonically. Thus the Fick formulation fails even at the qualitative level to explain the experimental results. It is concluded that the Maxwell-Stefan formulation is indispensable for the description of mass transport across zeolite membranes.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Mass Transfer; Zeolite Membrane; Maxwell-stefan Theory; Fick Formulation; Microporous Diffusion
ID Code:65520
Deposited On:17 Oct 2011 02:47
Last Modified:01 Aug 2012 10:45

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