Analysis of the permeation behavior of ethanol/water mixtures through a polydimethylsiloxane (PDMS) membrane in pervaporation and vapor permeation conditions

Hietaharju, Jenna; Kangas, Jani; Tanskanen, Juha

doi:10.1016/j.seppur.2019.115738

Cited by 27 publications

(24 citation statements)

References 52 publications

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“…(a, b) Experimental data (indicated by symbols) of Hietaharju et al. 3 for the pervaporation mass fluxes of penetrants ethanol (1) and water (2) across PDMS ( m ) at 313 K (red circles) and 333 K (green squares), and vapor permeation (blue triangles), plotted as a function of the mass fraction of ethanol in the liquid feed mixture in the upstream compartment ω 1 L . The continuous solid lines are M-S model calculations (scenario A) using eqs 3, 5, and 10.…”

Section: Resultsmentioning

confidence: 99%

“…Ratios of the mass fluxes of ethanol to water for ethanol/water pervaporation across PDMS at 313 K plotted as a function of the mass fraction of ethanol in the liquid feed mixture in the upstream compartment ω 1 L . Model calculations using three different scenarios A (continuous solid lines), B (dashed lines), and C (dotted lines) are compared to experimental data (symbols) of Hietaharju et al 3 The input diffusivity data are provided in Tables S2 and S3 of the Supporting Information.…”

Section: Resultsmentioning

confidence: 99%

“…This article has threefold objectives. First, we aim to demonstrate that thermodynamic coupling effects are the root cause of mutual slowing-down effects that have been observed in the published experimental studies of Hietaharju et al, 3 and Nasiri and Aroujalian 4 for ethanol/water pervaporation across PDMS membrane. The second objective is to show that the off-diagonal elements Γ 12 and Γ 21 also engender mutual slowing-down effects in hydrophilic (CA, 6,7 polyimide, 13 and PVA/PAN composite 11 ) membranes.…”

Section: Introductionmentioning

confidence: 98%

“…1−9 Alcohol-selective separations are achievable with hydrophobic membranes such as poly(dimethylsiloxane) (PDMS). 3−5,10 With hydrophilic membranes (e.g., cellulose acetate (CA), polyimide, and poly(vinylalcohol)/polyacrylonitrile (PVA/PAN) composites), the separations are selective to water. 9,11−13 Water-selective separations are also achieved by exploiting size exclusion in hydrophobic perfluorinated polymer membranes.…”

Section: Introductionmentioning

confidence: 99%

“…The significance of correlation effects has been highlighted in earlier published works. 3,13,16−18 The main focus of this article is on the significance of thermodynamic coupling effects in alcohol/water pervaporation.…”

Section: Introductionmentioning

confidence: 99%

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Highlighting Thermodynamic Coupling Effects in Alcohol/Water Pervaporation across Polymeric Membranes

Krishna

2019

ACS Omega

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The pervaporation of binary alcohol/water mixtures across polymeric membranes is modeled by combining the Maxwell–Stefan (M-S) diffusion formulation with the Flory–Huggins (F-H) description of sorption equilibrium. The combined M-S/F-H model shows that the flux of each penetrant species is coupled to the driving force of its partner penetrant. Two types of coupling contributions can be distinguished: (i) coupling arising out of correlated motions of penetrants in the polymer matrix and (ii) thermodynamic coupling. The focus of this article is on the contribution of thermodynamic coupling, which is quantified by the set of coefficients , where ai, the activity of species i, is dependent on the volume fractions ϕi,ϕj, of both penetrants in the polymeric membrane. Detailed analyses of published experimental data for pervaporation of ethanol/water feed mixtures of varying compositions in both hydrophobic (poly(dimethylsiloxane)) and hydrophilic (cellulose acetate, polyimide, and polyvinyl alcohol/polyacrylonitrile composite) membranes show that in all cases, the cross-coefficients Γij (i ≠ j) are negative and may attain large magnitudes in relation to the diagonal elements Γii. The net result is that the permeation fluxes of each penetrant are suppressed by its partner, resulting in mutual slowing down of permeation fluxes. If thermodynamic coupling effects are ignored, significantly higher fluxes are anticipated than those that are experimentally observed.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Highlighting Thermodynamic Coupling Effects in Alcohol/Water Pervaporation across Polymeric Membranes

Krishna

2019

ACS Omega

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Inter‐integration reactive distillation with vapor permeation for ethyl levulinate production: Equipment development and experimental validating

Han

Gao

et al. 2021

AIChE Journal

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Ethyl levulinate, one of the main derivatives of levulinic acid (LA), is of significant potential as platform chemicals for bio‐based materials. The esterification of LA was generally carried out in a conventional batch reactor or in a conventional reactive distillation column. However, traditional methods are hard to deal with equilibrium limited reactions and azeotropic issues. Therefore, the inter‐integration reactive distillation with vapor permeation (R‐VP‐D) process, which integrated reaction, vapor permeation, and distillation into one single unit, is proposed in this paper and validated in the pilot‐scale experiments. A comparative study is made between a pilot‐scale RD column with and without VP module. Owing to the water‐selective VP membrane and the ingenious design of related apparatuses, the R‐VP‐D process reveal a superiority in LA conversion of 21.9% maximum higher than RD without VP process and removing of product water about 53.6% from VP module, which indicates its promising industrial application in process intensification field.

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Comprehensive analysis on anomalous phenomenon of ethanol‐soluble poly(vinyl butyral) membrane for ethanol recovery via pervaporation

Huang

Wei

et al. 2022

AIChE Journal

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show abstract

Analysis of the permeation behavior of ethanol/water mixtures through a polydimethylsiloxane (PDMS) membrane in pervaporation and vapor permeation conditions

Abstract: Mutual interactions between penetrants have importance in the permeation behavior -Mutual slowing down of penetrants observed -Permeation behavior analyzed with a Maxwell-Stefan model -Ethanol-water separations both in pervaporation and vapor permeation conditions

Cited by 27 publications

References 52 publications

Highlighting Thermodynamic Coupling Effects in Alcohol/Water Pervaporation across Polymeric Membranes

Highlighting Thermodynamic Coupling Effects in Alcohol/Water Pervaporation across Polymeric Membranes

Inter‐integration reactive distillation with vapor permeation for ethyl levulinate production: Equipment development and experimental validating

Comprehensive analysis on anomalous phenomenon of ethanol‐soluble poly(vinyl butyral) membrane for ethanol recovery via pervaporation

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