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|Title:||Nanometric thin skinned dual-layer hollow fiber membranes for dehydration of isopropanol|
|Keywords:||Dual-layer hollow fiber membrane|
Positron annihilation spectroscopy
|Citation:||Tang, Y.P., Widjojo, N., Chung, T.S., Weber, M., Maletzko, C. (2013-08). Nanometric thin skinned dual-layer hollow fiber membranes for dehydration of isopropanol. AIChE Journal 59 (8) : 2943-2956. ScholarBank@NUS Repository. https://doi.org/10.1002/aic.14067|
|Abstract:||A novel sulfonated polyphenylsulfone (sPPSU)/polyphenylsulfone (PPSU)-based dual-layer hollow fiber membrane with a nanometric thin skin layer has been designed for biofuel dehydration via pervaporation. The thickness of skin selective layer is in the range of 15-90 nm under different spinning conditions measured by positron annihilation spectroscopy (PAS) coupled with a mono-energetic positron beam. The effects of outer-layer dope properties, coagulation temperature, and dope flow rate during spinning were systematically investigated. By tuning these spinning parameters, a high performance sPPSU/PPSU-based dual-layer hollow fiber membrane with desirable morphology was successfully obtained. Particularly owing to its nanometric thin skin layer, a high flux of 3.47 kg/m2h with a separation factor of 156 was achieved for dehydration of an 85 wt % isopropanol aqueous solution at 50°C. After post thermal treatment at 150°C for 2 h, the separation factor was dramatically improved to 687 while flux dropped to 2.30 kg/m2h, which make it comparable to the inorganic membranes. In addition, excellent correlations were found among the results from field emission scanning electron microscopy, PAS spectra, and separation performance. © 2013 American Institute of Chemical Engineers.|
|Source Title:||AIChE Journal|
|Appears in Collections:||Staff Publications|
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