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Water–alcohol separation by pervaporation through poly(amide‐sulfonamide)s (PASAs) membranes
Author(s) -
Chan WingHong,
Ng ChingFai,
LamLeung SueiYee,
He Xumin,
Cheung OnCheung
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(19970808)65:6<1113::aid-app6>3.0.co;2-n
Subject(s) - pervaporation , membrane , polymer chemistry , permeation , aqueous solution , solvent , sorption , chemistry , polyamide , methanol , ethanol , chemical engineering , materials science , organic chemistry , biochemistry , engineering , adsorption
Pervaporation membranes derived from seven homopolymers of poly(amide‐sulfonamide)s (PASAs) were prepared by casting 10–17% polymer solutions of N,N ‐dimethylacetamide. The membranes were characterized by sorption experiments, scanning electron microscope, and wide‐angle X‐ray diffraction. During the pervaporation of 90 wt % aqueous solution of methanol, ethanol, 1‐propanol, and 2‐propanol, all membranes were preferentially permeable to water, and their separation factors were mainly dependent on the molecular weight of the solvent. The exact structure of the PASAs had a profound effect on their pervaporation characteristics. Polymeric membrane based on N,N ′‐bis(4‐aminophenylsulfonyl)‐1,3‐diaminopropane and isophthaloyl chloride exhibited the best selectivity factor of 1984 for a 10 : 90 (by weight) mixture of water/ethanol at 20°C. However, the permeation rates of all materials for dehydration of 90 wt % ethanol were slow in a range of 6.6–34.4 g m −2 h −1 . © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 65:1113–1119, 1997