Pervaporative permeations of homologous series of alcohol aqueous mixtures through a hydrophilic membrane

Yeom, C. K.; Lee, S. H.; Lee, J. M.

doi:10.1002/1097-4628(20010124)79:4<703::aid-app150>3.3.co;2-f

Cited by 6 publications

(10 citation statements)

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“…A good pervaporation membrane material should have a high permeation flux and separation factor for the pervaporation dehydration of alcohol. Most studies on pervaporation dehydration of alcohols have focused on highly hydrophilic materials because of their strong affinity to water molecules 12–14. In particular, poly(vinyl alcohol) (PVA) is widely used as a membrane material for the separation of water/ethanol solutions by pervaporation because the PVA membrane shows remarkable selectivity toward water and has excellent film‐forming characteristics with good resistance to organic mixtures, even though it has poor stability in aqueous mixtures.…”

Section: Introductionmentioning

confidence: 99%

Incorporation of multiwalled carbon nanotubes into poly(vinyl alcohol) membranes for use in the pervaporation of water/ethanol mixtures

Choi

Jegal

Kim

et al. 2008

J of Applied Polymer Sci

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Multiwalled carbon nanotube (MWNT)/poly (vinyl alcohol) (PVA) blend membranes were prepared by the solution-casting method to determine the effect of MWNTs with nanoscale empty inner space along the tube length on the pervaporation performance of a PVA membrane in the separation of alcohol/water mixtures. The blend membranes were then characterized with several analytical methods such as transmission electron microscopy, differential scanning calorimetry, and X-ray diffractometry: Transmission electron microscopy showed that the MWNTs were homogeneously distributed through the PVA matrix. The glass-transition temperature of the PVA membrane was increased from 69.21 to 78.53 C via blending with MWNTs. The crystallinity of the PVA matrix decreased with increasing MWNTs up to 5 wt % from 41 to 36%. The pervaporation properties of the blend membranes were completely different from those of the pure PVA membrane in the separation of water/ethanol mixtures. The flux of the membrane was increased with the amount of MWNTs, whereas the separation factor was maintained up to 1.0 wt % MWNTs. However, beyond that, it was reduced. These results suggested that two factors, the crystallinity of the membrane and the diameters of the MWNTs, affected the performance of the membranes.

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Section: Introductionmentioning

confidence: 99%

Incorporation of multiwalled carbon nanotubes into poly(vinyl alcohol) membranes for use in the pervaporation of water/ethanol mixtures

Choi

Jegal

Kim

et al. 2008

J of Applied Polymer Sci

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“…Performance of pervaporation is dependent not only on the membranes but also on the operating parameters such as feed composition, temperature, and other factors 11–14. Because the sorption and diffusion of each component are strongly concentration dependent, changing of feed composition will affect the flux and selectivity in pervaporation.…”

Section: Introductionmentioning

confidence: 99%

“…Because the sorption and diffusion of each component are strongly concentration dependent, changing of feed composition will affect the flux and selectivity in pervaporation. Yeom et al12 investigated a homologous series of aqueous alcohol solutions through a poly (vinyl alcohol) (PVA) membrane with various feed compositions and found that the feed composition would directly affect the affinities between feed components and membrane as well as the mutual interactions among the feed components. On the other hand, changing the operating temperature may cause the change of membrane structure and mutual interaction between components, which consequently contribute to the change of the mass transport coefficient of components 13.…”

Section: Introductionmentioning

confidence: 99%

Pervaporation study of water and tert‐butanol mixtures

Guo

Chung

Matsuura

et al. 2004

J of Applied Polymer Sci

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The permeation behavior of water/tert-butanol mixture through Sulzer Pervap2510 hydrophilic poly(vinyl alcohol) membranes was investigated and the effects of feed composition and temperature on separation efficiency of the membranes were studied. The pervaporation experiments were carried out with feed water content varying from 0 to 20 wt % according to the existing industrial needs and with the feed temperature from 60 to 100°C. Over this range, both water flux and separation factor increased with increasing water content and feed temperature. These phenomena may be attributed to (1) the strong interaction between water and the membrane, (2) the decoupling effect of the permeants and the membrane at elevated temperatures, and (3) the steric hindrance effect of branch chain alcohol. The permeability ratio (the ideal separation factor) of water to tert-butanol across the membrane was calculated and found to follow the same relationship with increasing temperature and water content. Both flux and separation factor obtained from the Pervap2510 membrane in this study were much higher than previous reported values, possible causes for which were analyzed.

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“…This behavior can be attributed to the characteristics of both diffusivity and the solubility. The solubility is a thermodynamic parameter that provides a measure of the amount of penetrant sorbed by the membrane at equilibrium . The permeance of water vapor and N 2 in the mixed gas was positively increased from 191.5 GPU to 731.9 GPU and 1.3 GPU to 16.7 GPU, respectively, with the composition of PEG increasing in the coating solution.…”

Section: Resultsmentioning

confidence: 99%

Water vapor removal using CA/PEG blending materials coated hollow fiber membrane

Kim

Ingole

Yun

et al. 2014

J of Chemical Tech & Biotech

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BACKGROUND: In this study, a polyethersulfone composite hollow fiber membrane was used for the separation of water vapor from mixed gas. For improvement of the separation properties, the fabricated membrane was coated with cellulose acetate (CA) and polyethylene glycol (PEG). RESULTS: Experiments on the permeation of water vapor and N2 gas mixture were performed to observe membrane behavior as a function of the coating conditions, such as the composition and molecular weight of PEG. The water vapor permeance and selectivity of water vapor/N 2 improved from 68.5 GPU to 444.1 GPU and from 76.1 to 175.5, respectively, using 5 wt% PEG 2000 blended coating solution. CONCLUSION: An increase in the PEG content and molecular weight of the coating solution affected the permeance and selectivity due to the hydrophilicity of PEG and the structural changes of the coating layer.

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Pervaporative permeations of homologous series of alcohol aqueous mixtures through a hydrophilic membrane

Cited by 6 publications

References 0 publications

Incorporation of multiwalled carbon nanotubes into poly(vinyl alcohol) membranes for use in the pervaporation of water/ethanol mixtures

Incorporation of multiwalled carbon nanotubes into poly(vinyl alcohol) membranes for use in the pervaporation of water/ethanol mixtures

Pervaporation study of water and tert‐butanol mixtures

Water vapor removal using CA/PEG blending materials coated hollow fiber membrane

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