Fabrication and Characterization of Aging Resistant Carbon Molecular Sieve Membranes for C₃ Separation Using High Molecular Weight Crosslinkable Polyimide, 6FDA-DABA

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Elsevier B.V.
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Abstract

Although propylene/propane separation remains a challenge for industrial processes, carbon molecular sieve membranes (CMSMs) have the potential to replace traditional separation methods. A high molecular weight crosslinkable polyimide was utilized to fabricate CMSMs, which showed pure gas permeabilities in excess of 400 barrers with propylene/propane selectivities as high as 25. Mixed gas (C₃H₈:C₃H₆ 50:50) measurements yielded a propylene permeability of 257 barrers and a selectivity of 20. CMSMs from thermally precrosslinked polymer precursors demonstrated a 98% propylene permeability retention after aging for 20 days under vacuum. Active gas flow conditions resulted in slightly lower permeability retention (92.5%) after 15 days of testing. ©2019 Elsevier B.V.

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Keywords
6FDA-DABA, Aging, Carbon molecular sieve membranes, Propylene/propane separation, Thermal crosslinking, Hexafluoroisopropylidene diphthalic anhydride, Diaminobenzoic acid, Pyromellitic dianhydride, Biphenyltetracarboxylic dianhydride, Dimethylacetamide, Methyl-2-pyrrolidone, Gel permeation chromatography, Tetrahydrofuran, Thermogravimetry, Scanning electron microscopy
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NSF (CBET-1403950)
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©2019 Elsevier B.V. All Rights Reserved.
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