Water-alcohol separation by pervaporation through poly(amide-sulfonamide)s (PASAs) membranes

Wing Hong CHAN*, Ching Fai Ng, Suei Yee Lam-Leung, Xumin He, On Cheung Cheung

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

30 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)1113-1119
Number of pages7
JournalJournal of Applied Polymer Science
Issue number6
Publication statusPublished - 8 Aug 1997

Scopus Subject Areas

  • Chemistry(all)
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry

User-Defined Keywords

  • Pervaporation
  • Poly(amide-sulfonamide)s
  • Symmetric nonporous membrane
  • Water-alcohol separation
  • Water-permeable membrane


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