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CO 2 ‐facilitated transport through poly( N ‐vinyl‐γ‐sodium aminobutyrate‐ co ‐sodium acrylate)/polysulfone composite membranes
Author(s) -
Wang Zhi,
Yi Chunhai,
Zhang Ying,
Wang Jixiao,
Wang Shichang
Publication year - 2006
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/app.23100
Subject(s) - polysulfone , permeation , selectivity , membrane , acrylate , polymer chemistry , nuclear chemistry , sodium , chemistry , carboxylate , facilitated diffusion , fourier transform infrared spectroscopy , materials science , chemical engineering , polymer , organic chemistry , copolymer , biochemistry , engineering , catalysis
Poly( N ‐vinyl‐γ‐sodium aminobutyrate‐ co ‐sodium acrylate) (VSA–SA)/polysulfone (PS) composite membranes were prepared for the separation of CO 2 . VSA–SA contained secondary amines and carboxylate ions that could act as carriers for CO 2 . At 20°C and 1.06 atm of feed pressure, a VSA–SA/PS composite membrane displayed a pure CO 2 permeation rate of 6.12 × 10 −6 cm 3 (STP)/cm 2 s cmHg and a CO 2 /CH 4 ideal selectivity of 524.5. In experiments with a mixed gas of 50 vol % CO 2 and 50 vol % CH 4 , at 20°C and 1.04 atm of feed pressure, the CO 2 permeation rate was 9.2 × 10 −6 cm 3 (STP)/cm 2 s cmHg, and the selectivity of CO 2 /CH 4 was 46.8. Crosslinkages with metal ions were effective for increasing the selectivity. Both the selectivity of CO 2 over CH 4 and the CO 2 permeation rate had a maximum against the carrier concentration. The high CO 2 permeation rate originated from the facilitated transport mechanism, which was confirmed by Fourier transform infrared with attenuated total reflectance techniques. The performance of the membranes prepared in this work had good stability. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 275–282, 2006