Pervaporation of Water/Ethanol Mixture through Partially Imidized Polyimide Membranes of Pyromellitic Dianhydride and 4,4'-Oxydianiline

Kim HJ; Jung B; Hong JM; Kang YS; Kim UY

Korea Polymer Journal, Vol.2, No.2, 148-151, October, 1994

Kim HJ, Jung B, Hong JM, Kang YS, Kim UY

The partially imidized polyimide membrane was prepared by varying imidization condition of the poly(amic acid) of pyromellitic dianhydride and 4,4''-oxydianiline. The carboxylic acid content of the membrane representing its hydrophilicity was controlled by the imidization condition. The effect of the carboxylic acid content on the pervaporation property of water/ethanol mixture was investigated. When the degree of imidization of the poly(amic acid) was 60% both high flux and high separation factor were obtained. The result was interpreted in terms of the facilitated transport where the carboxylic acid was considered to act as a carrier for the facilitated water transport.

[References]

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Kang YS, Jung B, Kim EY, Mol. Cryst. Liq. Cryst., 224, 137 (1993)

[1] Koros WJ, Fleming GK, Jordan SM, Kim TH, Hoehn HH, Prog. Polym. Sci., 13, 339 (1988)

[2] Neel J, Introduction to Pervaporation, in Pervaporation Membrane Separation Processes, pp. 1-109, R.Y.M. Huang, Ed., Elsevier, Amsterdam (1991)

[3] Yoshikawa M, Yukoshi T, Sanui K, Ogata N, J. Appl. Polym. Sci., 33, 2369 (1987)

[4] Lee YK, Tak T, Lee DS, Kim SC, J. Membr. Sci., 52, 157 (1990)

[5] Cabasso I, Liu Z, J. Membr. Sci., 24, 101 (1885)

[6] Uragami T, Takigawa K, Polymer, 31, 668 (1990)

[7] Yoshikawa M, Yukoshi T, Sanui K, Ogata N, J. Polym. Sci. A: Polym. Chem., 24, 1585 (1986)

[8] Karakane H, Tsuyumoto M, Maeda Y, Honda Z, J. Appl. Polym. Sci., 42, 3229 (1991)

[9] Kang YS, Lee SW, Kim UY, Shim JS, J. Membr. Sci., 51, 215 (1990)

[10] Kang YS, Jung B, Kim EY, Mol. Cryst. Liq. Cryst., 224, 137 (1993)