Densities and interfacial tensions for fatty acid methyl esters (from methyl formate to methyl heptanoate) plus water demixed mixtures at atmospheric pressure conditions

JOURNAL OF CHEMICAL THERMODYNAMICS

dc.creatorDel Pozo-Fábregas, Irene
dc.creatorCartes, Marcela
dc.creatorLlovell, Felix
dc.creatorMejía-Matallana, Sergio Andrés
dc.date2021-08-23T22:50:12Z
dc.date2022-07-08T20:25:02Z
dc.date2021-08-23T22:50:12Z
dc.date2022-07-08T20:25:02Z
dc.date2018
dc.date.accessioned2023-08-22T04:00:19Z
dc.date.available2023-08-22T04:00:19Z
dc.identifier1150656
dc.identifier1150656
dc.identifierhttps://hdl.handle.net/10533/250551
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8317627
dc.descriptionExperimental determination of mass densities and interfacial tensions (IFT) at liquid-liquid equilibrium (LLE) for methyl ester (FAME) demixed aqueous family (from methyl formate to methyl heptanoate) are reported as a function of temperature at atmospheric pressure (101.3 kPa). Mass density determinations are carried out in a vibrating tube densimeter, whereas a spinning drop tensiometer is used for performing IFT measurements. Furthermore, the IFT data have been correlated by using a simplified version of the Square Gradient Theory (SSGT) as applied to the Non-Random Two Liquids (NRTL) activity coefficient model. Based on the experimental results, the mass densities of both aqueous and methyl ester bulk phase decrease with temperature, whereas the IFT increases with the temperature and reaches a maximum value, which is related to the maximum tie line in the LLE. For higher temperatures, IFT starts to decrease with temperature. The correlation approach of IFT (SSGT + NRTL) was found to be suitable for correlating the IFT of the mixtures as a function of temperature and also provides a route to explore other interfacial properties, such as interfacial concentration profiles, which are difficult to measure. Considering the results from the calculated interfacial profiles along the interfacial region, the components (FAMEs and water) neither exhibit surface activity nor adsorption activity and the interfacial width decreases with temperature, as it was expected. (C) 2018 Elsevier Ltd.
dc.descriptionRegular 2015
dc.descriptionFONDECYT
dc.descriptionFONDECYT
dc.languageeng
dc.relationhandle/10533/111557
dc.relationhandle/10533/111541
dc.relationhandle/10533/108045
dc.relationhttps://doi.org/10.1016/j.jct.2018.02.010
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 Chile
dc.rightshttp://creativecommons.org/licenses/by-nc-nd/3.0/cl/
dc.rightsinfo:eu-repo/semantics/article
dc.rightsinfo:eu-repo/semantics/openAccess
dc.titleDensities and interfacial tensions for fatty acid methyl esters (from methyl formate to methyl heptanoate) plus water demixed mixtures at atmospheric pressure conditions
dc.titleJOURNAL OF CHEMICAL THERMODYNAMICS
dc.typeArticulo
dc.typeinfo:eu-repo/semantics/publishedVersion


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