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Modified pore-flow model for pervaporation mass transport in PVDF hollow
fiber membranes for ethanol–water separation
2010
Panu Sukitpaneenit a , Tai-Shung Chung a,* , Lan Ying Jiang b
a Department of Chemical & Biomolecular Engineering, National University of Singapore, 10 Kent Ridge
Crescent 4 Engineering Drive 4, Singapore 117576, Singapore, b School of Metallurgical Science and
Engineering, Central South University, Changsha 410083, Hunan, PR China
For the first time, the mass transport phenomenon in pervaporation of the ethanol/water system via PVDF asymmetric hollow
fiber membranes has been demonstrated through the pore-flow model and a newly modified pore-flow model has been
proposed. The modified pore-flow model differs from the pore-flow model by factoring in the contribution of Knudsen flow to
vapor transport, which was ignored by the pore-flow model. The correlation of transport parameters to membrane pore size is
explored and it is found that the pore size expansion (including the change of membrane surface morphology) is strongly
dependent on the solvent in contact. The modified pore-flow model shows a better prediction for the permeate composition
than the pore-flow model and both models exhibit an excellent prediction of total permeate mass flux. The significance of
Knudsen flow contribution in vapor-phase transport as stated in the modified pore-flow model is discussed from the
experimental and theoretical aspects.
Journal of Membrane Science, Volume 362, Issues 1-2, 15 October 2010, Pages 393-406
Instrument(s) used:

Force tensiometers > Sigma 701