The role of boundary layers in the removal of volatile organic compounds from water by pervaporation

Wijmans, J.G.; Athayde, A.L.; Daniels, Ramin; Ly, Jennifer; Kamaruddin, H.D.; Pinnau, Ingo

doi:10.1016/0376-7388(95)00194-8

Cited by 142 publications

(59 citation statements)

References 14 publications

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“…On 301 the other hand, if the more rapidly permeating species are also the more volatile, selectivity 302 increases as permeate pressure increases. As pointed out by Wijmans et al (1996), this 303 indicates a unique characteristic of pervaporation process since separation can be improved 304 by decreasing the driving force of the process. 305…”

Section: Pure Water As Feed Solution 155mentioning

confidence: 93%

Concentration by pervaporation of representative brown crab volatile compounds from dilute model solutions

Martínez

Sanz

Beltrán

2011

Journal of Food Engineering

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Section: Pure Water As Feed Solution 155mentioning

confidence: 93%

Concentration by pervaporation of representative brown crab volatile compounds from dilute model solutions

Martínez

Sanz

Beltrán

2011

Journal of Food Engineering

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“…The enrichment factors for the other two aqueous solutions have a parabolic shape of curve with membrane thickness. In removal of VOCs from water by pervaporation, it is commonly reported 4,18 that the enrichment factor increases with increasing membrane thickness. It is in conformation with the result on the aqueous solution containing dichloroethane, but not with the other results.…”

Section: Effect Of Membrane Thicknessmentioning

confidence: 99%

“…Therefore, the resistance arising from the concentration polarization would be attributed to the negative deviation from the linearity. It is assumed 18 that water permeation is independent of organic permeation in the removal of trace VOCs from water by pervaporation and is governed only by membrane resistance. However, the water flux in this figure does not have a linear relationship with an inverse membrane thickness either.…”

Section: Effect Of Membrane Thicknessmentioning

confidence: 99%

Removal of trace VOCs from water through PDMS membranes and analysis of their permeation behaviors

Yeom

Kim

Rhim

1999

J. Appl. Polym. Sci.

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ABSTRACT:The removal of trace chlorinated hydrocarbons from water has been performed through poly(dimethylsiloxane), which had been fabricated by addition crosslinking reaction. The membrane had a more hydrophobic characteristic than that fabricated by a condensation reaction because it has no polar groups in the polymeric chain, such as hydroxyl and chlorine groups. This study concentrated on the comparison of the permeation behaviors of homologous series of chloromethanes aqueous solutions with that of a chloroethane solution. It was suggested that when the hydrophobic characteristics of a membrane system is greater, water molecules in the membrane tend to exist in the form of clusters; thereby, the permeating size of water component increases, resulting in suppressing water permeation and increasing the enrichment factor for the organic component. The permeation behaviors at various temperatures and membrane thicknesses were indirectly interpreted in terms of the effect of concentration polarization and the effect of interactions of organic-membrane, and water-organic-absorbing membrane.

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“…To describe the mass transfer processes of a membrane, both the concentration and the partial vapour pressure are suitable. Pervaporation vapour pressure as a driving force is better to characterise the separation process of dilute solutions (WIJMANS et al, 1996) The total resistance is the sum of the boundary layer resistances and the membrane resistance. Resistance of the gaseous boundary layer can be neglected.…”

Section: Mathematical Modellingmentioning

confidence: 99%

Enrichment of pineapple aroma compounds from model solutions by sweeping-gas and vacuum-pervaporation

et al. 2014

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Our experiments were based on a model solution containing fi ve of the main pineapple aroma components. Both sweeping-gas pervaporation and vacuum-pervaporation methods were carried out. Measurements were performed at different temperatures and feed fl ow rates. The purposes of this study were to examine applicability of the two pervaporation methods in reference to the pineapple aroma recovery, the effects of the operating parameters on the process, and modelling the pervaporation process by resistance-in-series model. Higher enrichment could be reached with vacuum-pervaporation than the sweeping-gas method. The separation process is determined by the diffusion of compounds in the membrane, thus the resistance in the boundary layer at liquid side is negligible. Based on performed experiments, the pervaporation process can be applied in beverage industry for aroma recovery.

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The role of boundary layers in the removal of volatile organic compounds from water by pervaporation

Cited by 142 publications

References 14 publications

Concentration by pervaporation of representative brown crab volatile compounds from dilute model solutions

Concentration by pervaporation of representative brown crab volatile compounds from dilute model solutions

Removal of trace VOCs from water through PDMS membranes and analysis of their permeation behaviors

Enrichment of pineapple aroma compounds from model solutions by sweeping-gas and vacuum-pervaporation

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