Journal
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 44, Issue 23, Pages 8938-8943Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ie050836g
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An in-depth study of sorption, swelling, and permeation of aqueous ethanol, 2-propanol (IPA), and tert-butyl alcohol through BTDA-TDI/MDI (P84) co-polyimide membranes has been conducted. The superior separation performance toward aqueous IPA and tert-butyl alcohol mixtures mainly arises from four factors: (1) rigid P84 chains with a small d-space, (2) the lesser affinity between P84 and IPA as well as between P84 and tert-butyl alcohol, (3) a high sorption selectivity, and (4) steric hindrance induced by bulky IPA and tert-butyl alcohol molecules. However, because of severe chain swelling and relaxation in ethanol/water solutions as confirmed by XRD and DSC, P84 performs less impressively for the pervaporation dehydration of ethanol/water mixtures.
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