Macrovoid-free high performance polybenzimidazole hollow fiber membranes for elevated temperature H2/CO2 separations |
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| Affiliation: | 1. School of Chemistry and Chemical Engineering, Liaoning Normal University, Huanghe Road 850, Dalian 116029, China;2. Division of Energy Storage, Dalian Institute of Chemical Physics, Chinese Academy of Science, Zhongshan Road 457, Dalian 116023, China;1. Department of Chemical and Biomolecular Engineering, National University of Singapore, 117585, Singapore;2. Advanced Materials & Systems Research, BASF SE, RAP/OUB-B001, 67056, Ludwigshafen, Germany;3. Performance Materials, BASF SE, G-PM/PU-D219, 67056, Ludwigshafen, Germany;1. Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC 29208, USA;2. Carbon Capture and Separations for Energy Applications (CaSEA) Labs, Material Physics and Application Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA;1. Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 117585, Singapore;2. Advanced Materials and Systems Research, BASF SE, RAP/OUB - B1, 67056 Ludwigshafen, Germany;3. Performance Materials, BASF SE, G-PMF/SU-F206, 67056 Ludwigshafen, Germany;1. School of Chemistry and Chemical Engineering, Liaoning Normal University, Huanghe Road 850, Dalian 116029, China;2. Division of Energy Storage, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China |
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| Abstract: | Thermally robust membranes are required for H2 production and carbon capture from hydrocarbon fuel derived synthesis (syn) gas. Polybenzimidaole (PBI) materials have exceptional thermal, chemical and mechanical characteristics and high H2 perm-selectivity for efficient syngas separations at process relevant conditions. The large gas volumes processed mandate the use of a high-throughput, small footprint hollow fiber membrane (HFM) platform. In this work, an industrially attractive spinning protocol is developed to fabricate PBI HFMs with unprecedented H2/CO2 separation performance. A unique dope composition incorporating an acetonitrile diluent is discovered enabling asymmetric macro-void free PBI HFM fabrication using a water coagulant. The influences of dope viscosity, coagulant chemistry, and air gap on HFM morphology are evaluated. Elevated temperature (up to 350 °C) H2 permeances of 400 GPU with H2/CO2 selectivities > 20 are achieved. This unprecedented separation performance is a ground breaking achievement at temperatures traditionally considered out-of-reach for polymeric membranes. |
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| Keywords: | Polybenzimidazole Hollow fiber membrane Pre-combustion carbon capture Synthesis gas Hydrogen separation membrane IGCC |
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