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|Title:||PBI Hollow fibers for pervaporation dehydration of acetone|
|Authors:||Shi, G.M. |
|Source:||Shi, G.M.,Wang, Y.,Chung, T.-S. (2011). PBI Hollow fibers for pervaporation dehydration of acetone. 11AIChE - 2011 AIChE Annual Meeting, Conference Proceedings : -. ScholarBank@NUS Repository.|
|Abstract:||Acetone dehydration via pervaporation is challenging because acetone and water have close molecular sizes and acetone has a much higher vapor pressure than water. Acetone is also a powerful solvent which dissolves or swells most polymers. We have developed novel polybenzimidazole/BTDA-TDI/MDI (PBI/P84) dual-layer hollow fibers for pervaporation dehydration of acetone for industrial and biofuel separations. Both thermal and chemical cross-linking modifications were applied to the membranes in order to investigate their effectiveness to overcome acetone-induced swelling. Thermal treatment can effectively enhance separation performance, but performance stability can only be achieved through the cross-linking modification of PBI. Cross-linking by p-xylene dichloride followed by a thermal treatment above 250 °C show significant effectiveness to improve and stabilize pervaporation performance. The fractional free volume of the PBI selective layer reduces from 3.27% to 1.98% and 1.33%, respectively, after thermal treatment and a combination of chemical/thermal cross-linking modifications characterized by positron annihilation spectroscopy.|
|Source Title:||11AIChE - 2011 AIChE Annual Meeting, Conference Proceedings|
|Appears in Collections:||Staff Publications|
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