LrgpV1, Istex, Corpus, bibRecord, 000D83

Pervaporation of aqueous ester solutions through hydrophobic poly(ether-block-amide) copolymer membranes

Identifieur interne : 000D83 ( Istex/Corpus ); précédent : 000D82; suivant : 000D84

Pervaporation of aqueous ester solutions through hydrophobic poly(ether-block-amide) copolymer membranes

Auteurs : M. Kaddour Djebbar ; Q. T Nguyen ; R. Clément ; Y. Germain

Source :

Journal of Membrane Science [ 0376-7388 ] ; 1998.

RBID : ISTEX:914201014D1EE0F8E466F521F04C41254A05DFFC

English descriptors

Abstract

Abstract: The pervaporation of three ethyl esters (aroma model compounds) in aqueous solutions was studied with poly(ether-block-amide) copolymer (PEBA) membranes of different compositions. The ester flux increases linearly with the ether-unit (tetramethylene oxide) content. The slope of the increase changes from a low to a higher value at 50wt% polyether content. This behavior is explained by a change in the membrane structure from a continuous polyamide matrix structure to a polyether matrix one. The ester flux from saturated aqueous solutions increases from butyrate to propionate, then to acetate. This order differs from that of the poly(dimethylsiloxane) (PDMS) membrane whose flux was highest for butyrate and lowest for propionate ester. The PEBA membrane permeability and selectivity to the esters increase significantly with the polyether content. However, the best PEBA membrane had lower flux and selectivity to esters in aqueous solutions than the PDMS membrane. The activation energy for ester permeation was always lower than that for water permeation; its value was the highest for the PEBA membrane with the highest polyamide content.

Url:

https://api.istex.fr/document/914201014D1EE0F8E466F521F04C41254A05DFFC/fulltext/pdf

DOI: 10.1016/S0376-7388(98)00090-8

Links to Exploration step

ISTEX:914201014D1EE0F8E466F521F04C41254A05DFFC

Le document en format XML

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<front><div type="abstract" xml:lang="en">Abstract: The pervaporation of three ethyl esters (aroma model compounds) in aqueous solutions was studied with poly(ether-block-amide) copolymer (PEBA) membranes of different compositions. The ester flux increases linearly with the ether-unit (tetramethylene oxide) content. The slope of the increase changes from a low to a higher value at 50wt% polyether content. This behavior is explained by a change in the membrane structure from a continuous polyamide matrix structure to a polyether matrix one. The ester flux from saturated aqueous solutions increases from butyrate to propionate, then to acetate. This order differs from that of the poly(dimethylsiloxane) (PDMS) membrane whose flux was highest for butyrate and lowest for propionate ester. The PEBA membrane permeability and selectivity to the esters increase significantly with the polyether content. However, the best PEBA membrane had lower flux and selectivity to esters in aqueous solutions than the PDMS membrane. The activation energy for ester permeation was always lower than that for water permeation; its value was the highest for the PEBA membrane with the highest polyamide content.</div>
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<abstract>The pervaporation of three ethyl esters (aroma model compounds) in aqueous solutions was studied with poly(ether-block-amide) copolymer (PEBA) membranes of different compositions. The ester flux increases linearly with the ether-unit (tetramethylene oxide) content. The slope of the increase changes from a low to a higher value at 50wt% polyether content. This behavior is explained by a change in the membrane structure from a continuous polyamide matrix structure to a polyether matrix one. The ester flux from saturated aqueous solutions increases from butyrate to propionate, then to acetate. This order differs from that of the poly(dimethylsiloxane) (PDMS) membrane whose flux was highest for butyrate and lowest for propionate ester. The PEBA membrane permeability and selectivity to the esters increase significantly with the polyether content. However, the best PEBA membrane had lower flux and selectivity to esters in aqueous solutions than the PDMS membrane. The activation energy for ester permeation was always lower than that for water permeation; its value was the highest for the PEBA membrane with the highest polyamide content.</abstract>
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<notesStmt><note type="content">Fig. 1: Schematic representation of the pervaporation setup: (1) liquid mixture inlet tube; (2) stirred cell; (3) heat exchanger; (4) circulation pump; (5) pirani gauge; (6) pressure release valve protected with a drying device; (7), (8), and (9) liquid air traps; (10) vacuum pump</note>
<note type="content">Fig. 2: FTIR spectra of PEBA 3 ((a) 33wt% polyether) and PEBA 5 ((b) 67wt% polyether) films.</note>
<note type="content">Fig. 3: DSC thermograms of different PEBA membranes ((a) PEBA 2; (b) PEBA 3; (c) PEBA 4; (d) PEBA 5; (e) PEBA 6). For the sake of clarity, the curves are slightly shifted on the ordinate scale to show the differences.</note>
<note type="content">Fig. 4: Ester fluxes versus ether-unit content in PEBA membranes. Pervaporation of saturated aqueous solutions of ethyl acetate, ethyl propionate and ethyl butyrate at 30°C.</note>
<note type="content">Fig. 5: Water flux versus ether-unit content in PEBA membranes. Pervaporation of saturated aqueous solutions of ethyl acetate, ethyl propionate and ethyl butyrate at 30°C.</note>
<note type="content">Fig. 6: Ester contents in the permeate versus ether-unit content. Pervaporation of saturated aqueous solutions of ethyl acetate, ethyl propionate and ethyl butyrate at 30°C.</note>
<note type="content">Fig. 7: Ethyl acetate flux versus ether-unit content in PEBA membranes. Pervaporation of ethyl acetate saturated solutions at 30°C, 40°C and 50°C.</note>
<note type="content">Table 1: Some properties of the esters used in this study</note>
<note type="content">Table 2: Physical properties of the studied PEBA membranes</note>
<note type="content">Table 3: Slope a and intercept b of the linear relationship between the ester content in the permeate Cp and the ether-unit content xe: Cp=axe+b (solute concentrations (saturated aqueous solutions at 30°C): ethyl acetate: 84g/l, ethyl propionate: 20g/l, and ethyl butyrate: 6g/l)</note>
<note type="content">Table 4: Permeation activation energy for different permeants and membranes</note>
<note type="content">Table 5: Water and ester permeation fluxes and enrichment factors of different membranes in pervaporation of saturated aqueous solutions of ethyl acetate, propionate and butyrate at 30°C</note>
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<abstract xml:lang="en"><p>The pervaporation of three ethyl esters (aroma model compounds) in aqueous solutions was studied with poly(ether-block-amide) copolymer (PEBA) membranes of different compositions. The ester flux increases linearly with the ether-unit (tetramethylene oxide) content. The slope of the increase changes from a low to a higher value at 50wt% polyether content. This behavior is explained by a change in the membrane structure from a continuous polyamide matrix structure to a polyether matrix one. The ester flux from saturated aqueous solutions increases from butyrate to propionate, then to acetate. This order differs from that of the poly(dimethylsiloxane) (PDMS) membrane whose flux was highest for butyrate and lowest for propionate ester. The PEBA membrane permeability and selectivity to the esters increase significantly with the polyether content. However, the best PEBA membrane had lower flux and selectivity to esters in aqueous solutions than the PDMS membrane. The activation energy for ester permeation was always lower than that for water permeation; its value was the highest for the PEBA membrane with the highest polyamide content.</p>
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<item><term>Pervaporation</term>
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<item><term>Ethyl esters</term>
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<item><term>Aqueous solutions</term>
</item>
<item><term>Aroma extraction</term>
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<item><term>Poly(ether-block-amide)</term>
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<head><ce:title>Pervaporation of aqueous ester solutions through hydrophobic poly(ether-block-amide) copolymer membranes</ce:title>
<ce:author-group><ce:author><ce:given-name>M</ce:given-name>
<ce:surname>Kaddour Djebbar</ce:surname>
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<ce:surname>Nguyen</ce:surname>
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<ce:surname>Clément</ce:surname>
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<ce:surname>Germain</ce:surname>
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<ce:textfn>LCPM, CNRS – UMR 7568, ENSIC, 1 rue Grandville, BP-45154 000 NancyFrance</ce:textfn>
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<ce:affiliation id="AFF2"><ce:label>b</ce:label>
<ce:textfn>“Polymers, Biopolymers, Membranes” Lab, CNRS – UMR 6522, Rouen University76821 Mont St AignanFrance</ce:textfn>
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<ce:affiliation id="AFF3"><ce:label>c</ce:label>
<ce:textfn>LEM, CERDATO, ATOCHEM27470 SerquignyFrance</ce:textfn>
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<ce:text>Corresponding author. Tel.: +33 3831 75029; fax: +33 3833 79977; e-mail: clement@lcpm.ensic.u-nancy.fr</ce:text>
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<ce:abstract-sec><ce:simple-para>The pervaporation of three ethyl esters (aroma model compounds) in aqueous solutions was studied with poly(ether-block-amide) copolymer (PEBA) membranes of different compositions. The ester flux increases linearly with the ether-unit (tetramethylene oxide) content. The slope of the increase changes from a low to a higher value at 50<ce:hsp sp="0.25"></ce:hsp>
wt% polyether content. This behavior is explained by a change in the membrane structure from a continuous polyamide matrix structure to a polyether matrix one. The ester flux from saturated aqueous solutions increases from butyrate to propionate, then to acetate. This order differs from that of the poly(dimethylsiloxane) (PDMS) membrane whose flux was highest for butyrate and lowest for propionate ester. The PEBA membrane permeability and selectivity to the esters increase significantly with the polyether content. However, the best PEBA membrane had lower flux and selectivity to esters in aqueous solutions than the PDMS membrane. The activation energy for ester permeation was always lower than that for water permeation; its value was the highest for the PEBA membrane with the highest polyamide content.</ce:simple-para>
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<ce:keywords class="keyword"><ce:section-title>Keywords</ce:section-title>
<ce:keyword><ce:text>Pervaporation</ce:text>
</ce:keyword>
<ce:keyword><ce:text>Ethyl esters</ce:text>
</ce:keyword>
<ce:keyword><ce:text>Aqueous solutions</ce:text>
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<ce:keyword><ce:text>Aroma extraction</ce:text>
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<ce:keyword><ce:text>Poly(ether-block-amide)</ce:text>
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<abstract lang="en">Abstract: The pervaporation of three ethyl esters (aroma model compounds) in aqueous solutions was studied with poly(ether-block-amide) copolymer (PEBA) membranes of different compositions. The ester flux increases linearly with the ether-unit (tetramethylene oxide) content. The slope of the increase changes from a low to a higher value at 50wt% polyether content. This behavior is explained by a change in the membrane structure from a continuous polyamide matrix structure to a polyether matrix one. The ester flux from saturated aqueous solutions increases from butyrate to propionate, then to acetate. This order differs from that of the poly(dimethylsiloxane) (PDMS) membrane whose flux was highest for butyrate and lowest for propionate ester. The PEBA membrane permeability and selectivity to the esters increase significantly with the polyether content. However, the best PEBA membrane had lower flux and selectivity to esters in aqueous solutions than the PDMS membrane. The activation energy for ester permeation was always lower than that for water permeation; its value was the highest for the PEBA membrane with the highest polyamide content.</abstract>
<note type="content">Fig. 1: Schematic representation of the pervaporation setup: (1) liquid mixture inlet tube; (2) stirred cell; (3) heat exchanger; (4) circulation pump; (5) pirani gauge; (6) pressure release valve protected with a drying device; (7), (8), and (9) liquid air traps; (10) vacuum pump</note>
<note type="content">Fig. 2: FTIR spectra of PEBA 3 ((a) 33wt% polyether) and PEBA 5 ((b) 67wt% polyether) films.</note>
<note type="content">Fig. 3: DSC thermograms of different PEBA membranes ((a) PEBA 2; (b) PEBA 3; (c) PEBA 4; (d) PEBA 5; (e) PEBA 6). For the sake of clarity, the curves are slightly shifted on the ordinate scale to show the differences.</note>
<note type="content">Fig. 4: Ester fluxes versus ether-unit content in PEBA membranes. Pervaporation of saturated aqueous solutions of ethyl acetate, ethyl propionate and ethyl butyrate at 30°C.</note>
<note type="content">Fig. 5: Water flux versus ether-unit content in PEBA membranes. Pervaporation of saturated aqueous solutions of ethyl acetate, ethyl propionate and ethyl butyrate at 30°C.</note>
<note type="content">Fig. 6: Ester contents in the permeate versus ether-unit content. Pervaporation of saturated aqueous solutions of ethyl acetate, ethyl propionate and ethyl butyrate at 30°C.</note>
<note type="content">Fig. 7: Ethyl acetate flux versus ether-unit content in PEBA membranes. Pervaporation of ethyl acetate saturated solutions at 30°C, 40°C and 50°C.</note>
<note type="content">Table 1: Some properties of the esters used in this study</note>
<note type="content">Table 2: Physical properties of the studied PEBA membranes</note>
<note type="content">Table 3: Slope a and intercept b of the linear relationship between the ester content in the permeate Cp and the ether-unit content xe: Cp=axe+b (solute concentrations (saturated aqueous solutions at 30°C): ethyl acetate: 84g/l, ethyl propionate: 20g/l, and ethyl butyrate: 6g/l)</note>
<note type="content">Table 4: Permeation activation energy for different permeants and membranes</note>
<note type="content">Table 5: Water and ester permeation fluxes and enrichment factors of different membranes in pervaporation of saturated aqueous solutions of ethyl acetate, propionate and butyrate at 30°C</note>
<subject><genre>Keywords</genre>
<topic>Pervaporation</topic>
<topic>Ethyl esters</topic>
<topic>Aqueous solutions</topic>
<topic>Aroma extraction</topic>
<topic>Poly(ether-block-amide)</topic>
<topic>PEBA</topic>
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Pervaporation of aqueous ester solutions through hydrophobic poly(ether-block-amide) copolymer membranes

Pervaporation of aqueous ester solutions through hydrophobic poly(ether-block-amide) copolymer membranes

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