Interfacial resistance of dual-layer asymmetric hollow fiber pervaporation membranes formed by co-extrusion |
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Authors: | Lan Ying Jiang Zheng Wei Song |
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Affiliation: | (1) School of Metallurgical Science and Engineering, Central South University, Changsha, 410083, Hunan, China |
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Abstract: | Interface is critical for dual-layer membranes fabricated by co-extrusion and dry-jet wet spinning. In this work, for the
first time, the importance of interface structure in overall membrane transport property was revealed by using Polysulfone
(outer layer)/Matrimid (inner) dual-layer hollow fibers as a demonstration system. Due to the dope formulations of the two
layers, dense skins came into formation at the shell side of Matrimid inner layer facing the interface. The Matrimid inner
layer obtained from the dual-layer hollow fiber with the thinnest Polysulfone outer layer exhibited a flux around 1.0 × 10−3 kg/m2-s and a separation factor of ~800 in tert-butanol dehydration (feed flow rate 30 L/h, temperature 80 °C, permeate pressure
2 mbar, the same for the other tests). An estimation based on resistance model clearly indicated the dominance of Matrimid
inner layer in the overall mass transfer of corresponding dual-layer membrane. As for hollow fibers with the thickest Polysulfone
outer layer, the bulk substrate comprising the interfacial dense skin of Matrimid inner layer also displayed significant resistance
and appreciable selectivity. Conclusively, the function of interface should not be ignored. The rule for the evolution of
interface structure requires further exploration for fully understanding and utilizing the composite membrane by co-extrusion
and phase inversion approach. |
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