Preparation of composite hollow fiber membranes of poly(ethylene oxide)-containing polyimide and their CO2/N2 separation properties |
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Institution: | 1. Institute of Nanoscience and Nanotechnology, National Center for Scientific Research “Demokritos”, Aghia Paraskevi, Athens 153, 41 Greece;2. School of Chemical Engineering, National Technical University of Athens, 9 Iroon Polytechniou street, Zografou, Athens 15780, Greece |
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Abstract: | Composite hollow fiber membranes were prepared by a dry-jet wet spinning process using a double layer spinneret. These membranes were composed of a thin and dense outer-layer of poly(ethylene oxide)-containing polyimide and a sponge-like inner layer of other polyimide. The outer layer was responsible for the separation and fabricated as thin as 1 μm. The permeation flux of CO2, RCO2, and the CO2/N2 selectivity decreased 40% and 10–20%, respectively, in a month after the membrane preparation. The steady performance was still high; for example, RCO2=69×10−6cm3 (STP)/(cm2 s cm Hg) and the selectivity of 33 at 323 K. |
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