Transesterification of Lactic Acid Oligomers with Ethanol, a Way to Anhydrous Ethyl Lactate: A Kinetic Study

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dc.contributor.authorFigalla, Silvestrcs
dc.contributor.authorPetrůj, Jaroslavcs
dc.contributor.authorTulková, Terezacs
dc.coverage.issue8cs
dc.coverage.volume23cs
dc.date.issued2018-08-15cs
dc.description.abstractA new method for the preparation of anhydrous ethyl ester of lactic acid was studied. The selected method is based on catalytic transesterification of lactic acid oligomers, which were prepared for this purpose by autocatalytic oligomerization of lactic acid. In this work, a kinetic model for the case of catalytic alcoholysis of oligoesters was derived assuming a first-order reaction and equimolar content of reactants in the reaction mixture. The model makes it possible to obtain the values of the reaction rate and equilibrium constants and the equilibrium alcohol concentration by regression analysis at one time. The model was verified by measuring the rate of consumption of ethanol over the time at various reaction temperatures with anhydrous FeCl3 as the catalyst. The reaction was studied at overpressure under autogenous conditions in the temperature range of 100–180 °C. For the catalyst concentration of 1 mol %, the activation energy value was 64.35 kJ·mol1. The dependence of equilibrium composition and rate constant on the temperature was obtained. The derived model is generally applicable to all first-order equilibrium reactions. The presumption is that the forward and reverse reactions are of the same order and have the same stoichiometry and equivalent amounts of reactants at the beginning of the reaction.en
dc.formattextcs
dc.format.extent1-13cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationMOLECULES. 2018, vol. 23, issue 8, p. 1-13.en
dc.identifier.doi10.3390/molecules23082044cs
dc.identifier.issn1420-3049cs
dc.identifier.orcid0000-0003-2392-8031cs
dc.identifier.orcid0000-0001-7780-0469cs
dc.identifier.other149385cs
dc.identifier.urihttp://hdl.handle.net/11012/85321
dc.language.isoencs
dc.publisherMDPIcs
dc.relation.ispartofMOLECULEScs
dc.relation.urihttp://www.mdpi.com/1420-3049/23/8/2044cs
dc.rightsCreative Commons Attribution 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/1420-3049/cs
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/cs
dc.subjectethyl lactateen
dc.subjecttransesterificationen
dc.subjectkineticsen
dc.subjectlactic aciden
dc.subjectoligomerizationen
dc.titleTransesterification of Lactic Acid Oligomers with Ethanol, a Way to Anhydrous Ethyl Lactate: A Kinetic Studyen
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
sync.item.dbidVAV-149385en
sync.item.dbtypeVAVen
sync.item.insts2025.02.03 15:38:03en
sync.item.modts2025.01.17 15:20:20en
thesis.grantorVysoké učení technické v Brně. Fakulta chemická. Ústav chemie a technologie ochrany životního prostředícs
thesis.grantorVysoké učení technické v Brně. Fakulta chemická. Centrum materiálového výzkumucs
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