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Influence of ethanol and temperature on adsorption of flavor-active esters on hydrophobic resins

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Show simple item record Saffarionpour, Shima Tam, Suk-Ying S. van der Wielen, Luuk A.M. Brouwer, Eric Ottens, Marcel 2018-12-06T12:46:35Z 2018-12-06T12:46:35Z 2019
dc.description peer-reviewed en_US
dc.description.abstract Flavor-active esters, produced during fermentation, are vital components and important contributors to the aroma of beer. In order to separate trace amounts of esters, their adsorption behavior in the presence of high concentrations of ethanol and their thermodynamic behavior under the influence of temperature needs to be understood. This study reports the influence of temperature on single component adsorption isotherms of four esters (i.e. ethyl acetate, isopentyl acetate, ethyl 4-methylpentanoate, and ethyl hexanoate) on two hydrophobic resins (i.e. Amberlite XAD16N, and Sepabeads SP20SS) and the estimation of heat, entropy, and Gibbs energy of adsorption. Higher heat and entropy of adsorption are obtained for ethyl hexanoate and ethyl 4-methylpentanoate in comparison, due to their higher hydrophobicity, stronger binding, and the exothermic nature of their adsorption. A higher concentration of ethanol (tested from 1 to 30% (v/v)), lowers the activity coefficient of esters in the aqueous phase, and subsequently lowers adsorption and Langmuir affinity parameters. Increase of temperature from 284.15 to 325.15 K shows a reverse influence on maximum adsorption capacity and Langmuir affinity parameters. Langmuir affinity parameters are obtained at various ethanol concentrations and temperatures. The reported parameters and thermodynamic properties in this paper, are essential for designing an industrial scale adsorption step for separation of flavor-active esters under non-isothermal conditions. en_US
dc.language.iso eng en_US
dc.publisher Elsevier en_US
dc.relation.ispartofseries Separation and Purification Technology;210, pp. 219-230
dc.subject flavor-active esters en_US
dc.subject adsorption en_US
dc.subject ethanol en_US
dc.subject temperature en_US
dc.subject isosteric enthalpy en_US
dc.title Influence of ethanol and temperature on adsorption of flavor-active esters on hydrophobic resins en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.identifier.doi 10.1016/j.seppur.2018.05.026
dc.contributor.sponsor Institute of Sustainable Process Technology en_US
dc.relation.projectid FO-10-05 en_US
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US

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