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Dehydration of ethanol/water mixtures was performed by a pervaporation process using asymmetric hollow fiber membranes made from commercially available polymers: Matrimid ® (polyimide) and Torlon ® (polyamide–imide). The as-spun membranes showed low separation factors of ethanol and water mixtures. To increase their separation performance, thermal annealing of the fibers was performed...
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