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Sorption, diffusion and pervaporation of water/ethanol mixtures in polyetherimide membranes
Author(s) -
Qariouh Houssain,
Schué Rossitza,
Schué Francois,
Bailly Christian
Publication year - 1999
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199903)48:3<171::aid-pi126>3.0.co;2-w
Subject(s) - pervaporation , polyetherimide , membrane , sorption , chemical engineering , permeation , materials science , solubility , diffusion , solvent , swelling , thermal diffusivity , polymer , chromatography , polymer chemistry , chemistry , organic chemistry , composite material , thermodynamics , physics , adsorption , engineering , biochemistry
Homogeneous and composite aromatic polyetherimide membranes wereprepared by casting from N ‐methylpyrrolidinone(NMP) solutions and by electrodeposition of polymer at thecathode, respectively. The membranes were evaluated for theirsorption, diffusion and pervaporation separation of water fromethanol with emphasis on the breaking of azeotropic composition. Themembrane performance was shown to be dependent on the feedconcentration, but still selective towards water over the wholecomposition range of the feed mixture. By looking at the surfaceenergy parameters, the determination of degree of swelling and thecalculation of deviation coefficients (ε), aninteresting insight was gained into the coupling effect in thissolvent/membrane system. From the sorption, diffusion andtemperature‐dependent permeation behaviour, it could beconcluded that in this system the diffusivity of permeant plays amajor role in determining the pervaporation performance, rather thanthe solubility. © 1999 Society of Chemical Industry