Abstract
Composite hydrophilic membranes, consisting of KA, NaA, CaA, and NaX zeolites and polyvinylalcohol polymer were prepared. The pervaporation and separation characteristics of different alcohol-water systems through these membranes were investigated at temperatures ranging from 20 to 50 °C. Distinct improvement on molecular transport and the molecular sieving effect of the zeolites have been observed. Pervaporation-aided catalytic esterification of acetic acid with ethanol and salicylic acid with methanol have been carried out in a membrane reactor, leading to a considerable increase in conversion and a reduction in reaction time as a result of continuous removal of water-through the membrane. Acetone-water separation by pervaporation on KA- and CaA-filled polyvinylalcohol membrane has been studied as well, which gives even better separation results than that of the ethanol-water system. Application of the zeolite-filled pervaporation membrane to the methanol-acetone condensation reaction also promotes the reaction.
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