High flux composite PTMSP-silica nanohybrid membranes for the pervaporation of ethanol/water mixtures

Claes, Stan; Vandezande, Pieter; Mullens, Steven; Leysen, R.; Sitter, Kristien De; Andersson, Anna; Maurer, Frans H.J.; Rul, H. Van den; Peeters, Roos; Bael, Marlies K. Van

doi:10.1016/j.memsci.2010.01.043

Cited by 78 publications

(26 citation statements)

References 32 publications

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“…The Pervatech PDMS membrane was found to have a higher flux than the Pervap 4060 membrane but a lower selectivity factor and permeate ethanol concentration, which is in agreement with results observed by Claes et al (2010).…”

Section: Resultssupporting

confidence: 89%

Influence of fermentation by-products on the purification of ethanol from water using pervaporation

Chovau

Gaykawad

Straathof

et al. 2011

Bioresource Technology

108

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a b s t r a c tPervaporation is claimed to be a promising separation technique for the purification of ethanol from fermentation broths during bio-ethanol production. In this study, influence of fermentation by-products on the purification of ethanol from water during hydrophobic pervaporation was investigated.Sugars and salts were found to increase the membrane performance. Reason for this was a change in vapor/liquid equilibrium. 2,3-Butanediol decreased the ethanol flux and selectivity factor, while glycerol exhibited no effect. This was explained by a strong sorption of butanediol into PDMS and no sorption of glycerol. Due to the presence of carboxylic acids, hydrophobicity degree of the Pervap 4060 membrane decreased, which resulted in an irreversible increase in water flux and decrease in separation performance. These observations suggested the presence of silicalite-based fillers in the membrane. When the pH was raised to a value above the dissociation constant, no changes in hydrophobicity degree and membrane performance were found.

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Section: Resultssupporting

confidence: 89%

Influence of fermentation by-products on the purification of ethanol from water using pervaporation

Chovau

Gaykawad

Straathof

et al. 2011

Bioresource Technology

108

View full text Add to dashboard Cite

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“…In comparison with conventional separation methods like adsorption and distillation, pervaporation (PV) has been identified as a promising alternative because of its low energy consumption and cost effectiveness. 10,11 In this context, the representative polymer materials used for ethanol-permselective membrane were mainly silicon-containing polymers, such as polydimethylsiloxane (PDMS), [12][13][14][15] poly[1-(trimethylsilyl)-1-propyne] (PTMSP) 16,17,18 and their derivatives 19,20 . 7,8,9 In the case of separating ethanol from water by PV, the membrane should be hydrophobic to facilitate the preferential permeation of ethanol molecule through the membrane.…”

Section: Introductionmentioning

confidence: 99%

Preparation and pervaporation characteristics of novel ethanol permselective polyelectrolyte–surfactant complex membranes

et al. 2015

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Recovery of ethanol from low concentration aqueous solution is a critical step for biofuel production. Pervaporation as an energy-efficient separation technology is attracting greater attention in ethanol retrieving.Here we introduce polyelectrolyte-surfactant complexes (PESCs) as membrane materials for ethanol recovery from aqueous solution. PESCs with controlled degree of complexation (DC) were prepared by mixing polyacrylic acid sodium (PAANa) and hexadecyltrimethylammonium bromide (CTAB) at different pH. Both the PESCs and their membranes (PESCMs) were characterized. Pervaporation data show that PESCMs could selectively transport ethanol molecules in the feed, and PESCM with the highest hydrophobicity gives the optimum performances in terms of selectivity. For example, the most hydrophobic PESCM (DC 0.79) features the optimum separation factor of 5.38 couple with a high flux of 4.23 kg m -2 h -1 in processing 5 wt% ethanolwater feed mixture at 30 0 C. The PESCM, which is low cost in terms of starting materials and manufacture engineering, represents an alternative membrane system with considerable potential for biofuel production.

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“…The performance of polymeric membranes regarding water flux can be correlated with membrane free volume (fv) and fv distribution . Positron techniques are widely used for the comparison of material properties as a function of fv in a wide variety of polymeric materials, including membranes .…”

Section: Resultsmentioning

confidence: 99%

Positron annihilation lifetime spectroscopy study of polyvinylpyrrolidone‐added polyvinylidene fluoride membranes: Investigation of free volume and permeation relationships

Eren

Guney

et al. 2020

Journal of Polymer Science

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Polyvinylidene fluoride (PVDF) membranes were prepared via the phase inversion method from casting solutions containing PVDF, dimethylformamide (DMF), and polyvinylpyrrolidone (PVP) as pore former. PVP was used in the casting solution in a range of 0–5 wt % and extracted. The effect on membranes of using PVP in the casting process was analyzed by X‐ray diffraction, differential scanning calorimetry, scanning electron microscopy, viscosity, and water permeability techniques. With an increase of PVP from 0 to 5 wt %, the PVDF casting solution viscosities increased from 858 to 1148 cP; the resulting PVDF membrane thickness increased; and the crystallinity of PVDF membranes decreased from 40.0 to 33.3%, which indicates that the addition of PVP inhibits the degree of crystallization in the PVDF membranes. SEM results revealed the shape and size of macropores in the membranes; these macropores changed after PVP addition to the casting solutions. The impact of structural changes on free‐volume properties was evaluated using positron annihilation lifetime spectroscopy (PALS) studies. PALS analysis indicated no effect on the average radius (~3.4 Å) of membrane free‐volume holes from the addition of PVP to the casting solution. However, the percentage of o‐Ps pick‐off annihilation intensity, I3, increased from 1.7 to 5.1% with increased PVP content. Further, increasing the PVP content from 0.5 to 5% resulted in an increased final pure water permeability flux. For instance, the 210 min flux for a 14% PVDF + 0.5% PVP membrane was found to be 3.3 times greater than a control membrane having the same PVDF concentration. © 2020 Wiley Periodicals, Inc. J. Polym. Sci. 2020, 58, 589–598

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High flux composite PTMSP-silica nanohybrid membranes for the pervaporation of ethanol/water mixtures

Cited by 78 publications

References 32 publications

Influence of fermentation by-products on the purification of ethanol from water using pervaporation

Influence of fermentation by-products on the purification of ethanol from water using pervaporation

Preparation and pervaporation characteristics of novel ethanol permselective polyelectrolyte–surfactant complex membranes

Positron annihilation lifetime spectroscopy study of polyvinylpyrrolidone‐added polyvinylidene fluoride membranes: Investigation of free volume and permeation relationships

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