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Permselectivities of aromatic polyamide membranes for aqueous alcohol mixtures in pervaporation

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Abstract

The separation of water/alcohol mixtures was carried out using a series of fluorine-containing aromatic polyamide membranes. Aromatic polyamides were prepared by direct polycondensation of fluorine-containing diamine (2,2-bis[4-(4-aminophenoxy)phenyl]hexafluoropropane, BAPPH) and various aromatic diacids. The separation factor toward water increased when the feed ethanol concentration was increased. The solubility of ethanol in aromatic polyamide membrane is higher than that of the water, but the diffusivity of water across the membrane is higher than that of alcohols. A separation factor of 83 and a permeation rate of 262 g/m2h with a 90 wt% feed ethanol concentration at 25 °C was obtained.

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Authors and Affiliations

  1. Department of Chemical Engineering, Nanya Junior College of Technology, Chung Li, 32034, Taiwan, ROC

    Yueh-Hua Wang & Kueir-Rarn Lee

  2. Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei, 10672, Taiwan, ROC

    Der-Jang Liaw

  3. Department of Chemical Engineering, Chung Yuan University, Chung Li, 32023, Taiwan, ROC

    Juin-Yih Lai

Authors
  1. Yueh-Hua Wang
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  2. Kueir-Rarn Lee
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  3. Der-Jang Liaw
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  4. Juin-Yih Lai
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Wang, YH., Lee, KR., Liaw, DJ. et al. Permselectivities of aromatic polyamide membranes for aqueous alcohol mixtures in pervaporation. J Polym Res 5, 31–36 (1998). https://doi.org/10.1007/s10965-006-0037-8

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  • DOI: https://doi.org/10.1007/s10965-006-0037-8

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