Investigation of surfactant addition effect on the vapor permeation of aqueous ethanol mixtures through polysulfone hollow fiber membranes

Tsai, Hui-An; Huang, Dong-Hai; Fan, Shu-Chin; Wang, Y.C.; Li, C.L.; Lee, K.R.; Lai, Juin‐Yih

doi:10.1016/s0376-7388(01)00661-5

Cited by 64 publications

(18 citation statements)

References 22 publications

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“…The total permeation ratio values of the PVA/a-MWCNT nanocomposite membranes are less than unity, indicating that the actual permeation rate is smaller than the ideal permeation rate. The permeation ratio value less than unity indicates the interaction of permeates and the membranes [29]. Thus, it shows the existence of interactions between the permeates and the PVA nanocomposite membranes.…”

Section: Intrinsic Properties Of the Pva/mwcnt Nanocompositesmentioning

confidence: 97%

Functionalized MWCNT and PVA Nanocomposite Membranes for Dielectric and Pervaporation Applications

Jose¹,

George²,

Mg³

et al. 2015

J Chem Eng Process Technol

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Novel PVA nanocomposite membranes were prepared with acid functionalized multiwalled carbon nanotubes (a-MWCNT) as the reinforcing material. The presence of functional groups on MWCNT is revealed by FTIR techniques. The excess swelling of poly (vinyl alcohol) (PVA) membranes were reduced by the crosslinking of glutraldehyde (GA). The functionalized MWCNT induces hydrophilicity to the PVA nanocomposites and the hydrophilic nature of the nanocomposites was revealed by the contact angle analysis. The effect of a-MWCNT concentration on the dielectric and DC conductivities of the PVA nanocomposites was studied very well. The electrical conductivity of the nanocomposites is increased with the concentration of MWCNT, and PVA with 1.5 wt% nanotube loaded membranes showed better dielectric properties. As the concentration of MWCNT increased to 1.5 wt%, the PVA nanocomposites got transformed from a region of insulator to semiconductor. DC conductivity also showed the same trend. The Voet model showed good agreement with the experimental results of the conductivity. We also found that the developed PVA/a-MWCNT nanocomposite membranes can be used to separate the azeotropic composition of water-ethanol mixtures. The pervaporation (PV) performance of the membranes is studied in terms of permeance and intrinsic selectivity. PVA with 0.5 wt% nanotube loaded nanocomposite membranes achieved 340% increment in intrinsic selectivity. The pervaporation performance of the membranes were in good agreement with the permeation ratio model, and the separation efficiency is influenced by the morphology of the membranes and the interaction of the filler and the permeates. It is also observed that the dielectric properties of the membranes were correlated with the concentration of the conductive nanofillers. Thus the present study provides good information on dielectric and the pervaporation performance of PVA/a-MWCNT nanocomposite membranes.

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Section: Intrinsic Properties Of the Pva/mwcnt Nanocompositesmentioning

confidence: 97%

Functionalized MWCNT and PVA Nanocomposite Membranes for Dielectric and Pervaporation Applications

Jose¹,

George²,

Mg³

et al. 2015

J Chem Eng Process Technol

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show abstract

“…It is well-known that asymmetric membranes are the better choice for separation operation due to the combination of the high selectivity of a dense membrane with the high permeation rate of a very thin skin layer. Asymmetric hollow fiber membranes have been widely applied to separation process such as microfiltration (MF), ultrafiltration (UF) and reverse osmosis (RO), owing to possess many advantageous characteristics than the flat ones that are prepared by the immersion precipitation process [1][2][3][4][5]. For pervaporation and gas separation, it is hard to possess satisfied * Corresponding author.…”

Section: Introductionmentioning

confidence: 99%

“…There are many methods to characterize the decrease of free volume, such as calculated by the method of Bondi, the increase of glass transition temperature (T g ), the decrease of coefficient of thermal expansion (CTE), the increase of tensile stress at break [3,17,18], etc. The positron annihilation spectroscopy (PAS) technique is based on an investigation on annihilation phenomena after injecting positrons into the membrane.…”

Section: Introductionmentioning

confidence: 99%

Characterization and pervaporation dehydration of heat-treatment PAN hollow fiber membranes

Tsai

Lee

et al. 2011

Journal of Membrane Science

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“…However, as weak non-solvent such as alcohol or solvent/non-solvent mixture was used as the coagulant, porous surface membrane usually can be fabricated [20][21][22][23]. Cheng et al [24] have reported that the polymer concentration of the top layer of PVDF membrane was lowered due to the exchange rate of solvent and non-solvent was decreased, resulted in a porous structure of the top layer.…”

Section: Introductionmentioning

confidence: 99%

Formation and evolution of a bicontinuous structure of PMMA membrane during wet immersion process

Kuo

Tsai

et al. 2008

Journal of Membrane Science

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Investigation of surfactant addition effect on the vapor permeation of aqueous ethanol mixtures through polysulfone hollow fiber membranes

Cited by 64 publications

References 22 publications

Functionalized MWCNT and PVA Nanocomposite Membranes for Dielectric and Pervaporation Applications

Functionalized MWCNT and PVA Nanocomposite Membranes for Dielectric and Pervaporation Applications

Characterization and pervaporation dehydration of heat-treatment PAN hollow fiber membranes

Formation and evolution of a bicontinuous structure of PMMA membrane during wet immersion process

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