Abstract
Pervaporation of ethanol/water mixtures at 25°C was examined on membranes of (AB)n type multiblock copolymers of bisphenol-A polycarbonate (PC) and polyoxyethylene (POE) with varying composition and block length. The membranes allowed preferential pervaporation of water over ethanol, and hence were effective for dehydration of the mixtures with high ethanol content. The rate of pervaporation was dominated by the solubility of the liquids to the membranes. Thus, the overall pervaporation rate was high for the swollen membranes. However, the permselectivity as judged by the separation factor α, which is the ratio of the water versus ethanol content in the permeate and in the feed, was reduced by swelling. Thus, an optimum for better selectivity and yet a reasonably high rate of pervaporation was attained by the sample with 75 wt% PC content and long blocks for the azeotropic (95.5% ethanol) mixture rather than by those with low PC content.
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Tanisugi, H., Kotaka, T. Liquid Transport through Mosaic Membranes of Hydrophobic–Hydrophilic Microdomains: Pervaporation of Aqueous Ethanol Solutions through Bisphenol-A Polycarbonate–Polyoxyethylene Multiblock Copolymers. Polym J 17, 499–508 (1985). https://doi.org/10.1295/polymj.17.499
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DOI: https://doi.org/10.1295/polymj.17.499