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

✍ Scribed by Wing-Hong Chan; Ching-Fai Ng; Suei-Yee Lam-Leung; Xumin He; On-Cheung Cheung

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 214 KB
• Volume: 65
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19970808)65:6<1113::aid-app6>3.0.co;2-n

✦ Synopsis

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 20ЊC. 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 02 h 01 . ᭧ 1997