Modified pore-flow model for pervaporation mass transport in PVDF hollow fiber membranes for ethanol–water separation

Sukitpaneenit, Panu; Chung, Tai‐Shung; Jiang, Lan Ying

doi:10.1016/j.memsci.2010.06.062

Cited by 64 publications

(29 citation statements)

References 49 publications

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“…In other words, the pore size and pore size distribution could play a crucial role on membrane separation performance. The modified pore-flow could explain the same phenomenon with the consideration of the competing contribution from two vapor transport phenomena namely surface flow and Knudsen flow; at a larger pore, the vapor transport via Knudsen flow is more prevailing rather than surface flow; leading to the enhancement of the permeability but the selectivity is sacrificed [44]. Nevertheless, supporting evidence and understanding on how pore size and pore size distribution really control the contributions of surface and Knudsen flows, and determine the membrane performance are insufficient.…”

Section: Introductionmentioning

confidence: 87%

“…The contact angle of PVDF hollow fiber membranes was measured using a KSV Sigma 701 Tensiometer (KSV Instruments Ltd., Finland) at 25 • C [44]. The fiber was brought into vertical contact with a reservoir of deionized water and the advancing contact angle was calculated with the aid of computer software.…”

Section: Morphology Crystallinity and Contact Angle Characterizationsmentioning

confidence: 99%

“…Recently, we explored and reported preliminary result on the pervaporation performance of PVDF hollow fibers for ethanol-water separation [44]. The membrane possessing a pore size of 50-66 nm exhibited a separation factor of 5 and a total permeation flux of 8000 g m −2 h −1 at 5 wt% ethanol feed solution at 40 • C. The separation performance characteristic of the PVDF hollow fibers reported can be attributed to the large surface pore size and effective surface porosity (pore size distribution) whereby the pervaporation mass transport in the membrane can be satisfactorily predicted via a modified pore-flow model; the smaller the pore size as well as the narrower the pore size distribution lead to better membrane selectivity.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Molecular design of the morphology and pore size of PVDF hollow fiber membranes for ethanol–water separation employing the modified pore-flow concept

Sukitpaneenit

Chung

2011

Journal of Membrane Science

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Section: Introductionmentioning

confidence: 87%

Section: Morphology Crystallinity and Contact Angle Characterizationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Molecular design of the morphology and pore size of PVDF hollow fiber membranes for ethanol–water separation employing the modified pore-flow concept

Sukitpaneenit

Chung

2011

Journal of Membrane Science

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“…Among the numerous and diverse pervaporation models described in the literature, the most popular ones are the pore-flow [23][24][25], the resistancein-series [26,27], Maxwell-Stefan theory-based [28], and the most widely used solution-diffusion model [29][30][31][32][33][34]. According to the latter, the mechanism of pervaporation is defined by the following steps:…”

Section: Models Of Pervaporationmentioning

confidence: 99%

Comparison of pervaporation models with simulation of hybrid separation processes

Valentínyi

Mizsey

2014

Per. Pol. Chem. Eng.

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“…The effect of support layer [32,33] on pervaporation flux was eliminated by reduction of the thickness of the support layer. The residual solvent was exchanged with alcohol for 5 minutes and dried at room temperature.…”

Section: Preparation and Characterization Of Pdms Membranementioning

confidence: 99%

Nonequilibrium Dissolution-diffusion Model for PDMS Membrane Pervaporation of ABE Water Binary System

Yang¹,

Wu²

2016

J Membra Sci Technol

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Pore flow model defined the dense layer as "pore" like nanofiltration which was not very reasonable, since the "pore" free volume formed by random movement of polymer chain was not fixed. Virtual phase change model was the combination of dissolution-diffusion model and pore flow model which was of some self-contradiction. Evaporationpermeation model treated the pervaporation as two separate processes, liquid evaporation and vapor permeation. The total separation factor was not equaled to the product of that two separation factors in the real operation. Irreversible thermodynamics model was set up on the chemical potential considering the coupling interaction of the AbstractPrevious models of equilibrium dissolution-diffusion, pore flow and virtual phase change cannot describe the mass transfer process of pervaporation precisely. The fact that dissolution process on the surface of the membrane does not reach equilibrium is seldom emphasized in the literature. The aim of the present work is to develop the nonequilibrium dissolution-diffusion model (nonequilibrium model) for membrane pervaporation process. In this research, the steps of dissolution and desorption were treated as the pseudo surface reaction processes on the surface based on the hypothesis of nonequilibrium dissolution at the interface of the feed liquid and membrane. The semi-experimental model was set based on steady state mass transfer, ignoring the concentration polarization and adsorption at the permeation side. Through linear fitting of the flux with different thickness of the membrane, the diffusion coefficients and adsorption kinetic rate constants of the model were achieved with equilibrium partition coefficient estimated by UNIFAC-ZM model. The calculated values of the model were well in consistent with experimental flux in the vacuum pervaporation of acetone, butanol and ethanol with polydimethylsiloxane membrane. The nonequilibrium model and its parameters will be further applied for prediction of separation performance and selection of operation conditions.

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Modified pore-flow model for pervaporation mass transport in PVDF hollow fiber membranes for ethanol–water separation

Cited by 64 publications

References 49 publications

Molecular design of the morphology and pore size of PVDF hollow fiber membranes for ethanol–water separation employing the modified pore-flow concept

Molecular design of the morphology and pore size of PVDF hollow fiber membranes for ethanol–water separation employing the modified pore-flow concept

Comparison of pervaporation models with simulation of hybrid separation processes

Nonequilibrium Dissolution-diffusion Model for PDMS Membrane Pervaporation of ABE Water Binary System

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