Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/74711
Title: PBI Hollow fibers for pervaporation dehydration of acetone
Authors: Shi, G.M. 
Wang, Y. 
Chung, T.-S. 
Issue Date: 2011
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
URI: http://scholarbank.nus.edu.sg/handle/10635/74711
ISBN: 9780816910700
Appears in Collections:Staff Publications

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