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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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