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A method for determining intrinsic diffusion coefficients in the pervaporation process

✍ Scribed by Tobias Walcher; Dietmar Göritz

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
429 KB
Volume
196
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

An apparatus based on a differential gas‐chromatographic detection system was designed in order to obtain information about the average permeation coefficient for pervaporation (PVAP) of pure liquids through isotactic poly(propylene) (i‐PP). The non‐ideal concentration dependence of diffusivity D prevents one from solving the diffusion equations exactly. Therefore, a method has been developed to obtain information on the intrinsic diffusion coefficient D~0~ and the plasticisation parameter γ for the two‐parameter function D(c) used. In additon, the concentration profile of the liquid in the membrane can be evaluated.

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