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We have investigated the feasibility of using polymeric membranes for the dehydration of industrial isopropanol (IPA) waste from MSD International GmbH by pervaporation and vapor permeation in this study. Four types of membranes were employed. They were (1) thin‐film composite hollow fiber consisting of a polyamide selective layer and a polyetherimide Ultem® substrate, (2) dual‐layer hollow fiber...