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Membrane transport of organics. I. Sorption and permeation of carboxylic acids in perfluorosulfonic and perfluorocarboxylic polymer membranes
Author(s) -
Wódzki Romuald,
Nowaczyk Jacek
Publication year - 1997
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/(sici)1097-4628(19970118)63:3<355::aid-app11>3.0.co;2-#
Subject(s) - permeation , membrane , sorption , polymer , chemical engineering , polymer chemistry , materials science , chemistry , organic chemistry , adsorption , engineering , biochemistry
Experimental studies have been made on the sorption and permeation of propionic (PA), acetic (AA), and formic (FA) acid in perfluorosulfonic Nafion, and perfluorocarboxylic Flemion membranes. The sorption isotherms show the increase of distribution coefficients K d = C m /C e with the p K of acids, i.e., K d ,PA > K d ,AA > K d ,FA . The transmembrane fluxes ( J ) and permeabilities ( P ) change their values in the same order for C e < 0.1 M and in the order J PA > J FA > J AA for higher concentrations. The differentiation of fluxes in single‐component dialyses does not result in the effective separation of AA and PA during their competitive permeation through the Nafion‐120 membrane. Under the same conditions, the Flemion membrane exhibits the preference toward propionic acid and transports PA and AA with the selectivity coefficient a AA PA equal to 1.5. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 63: 355–362, 1997