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Gas‐sweeping pervaporation: A method for studying the transport of solvent mixtures in polymers: Application to the methanol–propan‐1‐ol‐cellulose triacetate system
Author(s) -
Nguyen X. Q.,
Nguyen Q. T.,
Clement R.,
Uchytil P.
Publication year - 1994
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1994.070541304
Subject(s) - cellulose triacetate , pervaporation , permeation , methanol , membrane , solvent , chemistry , polymer , cellulose , selectivity , chemical engineering , solubility , diffusion , cellulose acetate , chromatography , polymer chemistry , organic chemistry , thermodynamics , biochemistry , physics , engineering , catalysis
A new method using a batch gas‐sweeping pervaporation was proposed for the measurement of different transport parameters of a polymer film to a solvent mixture. In addition to the total permeation flux and the selectivity of the film to the mixture, the diffusion coefficients and the permeation coefficients of the components can be determined. The method, which is based on new solutions of the second Fick law in which the upstream concentration is time‐dependent, was applied to the transport of methanol‐propan‐1‐ol mixtures through a cellulose triacetate membrane and their results were compared with those obtained in vacuum pervaporation. Both the methods give equivalent selectivity and permeation fluxes at all methanol contents. The diffusion coefficient of methanol, which was ca. 10 −7 cm 2 /s in cellulose triacetate when pure methanol was used, was found to be much smaller when methanol was mixed with propan‐1‐ol (ca. 10 −9 cm 2 /s). From the practical viewpoint, the cellulose triacetate membrane shows a high permeation flux with a rather good selectivity to methanol. © 1994 John Wiley & Sons, Inc.