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Kinetic study of the esterification process catalyzed by ionic liquids for fatty acid methyl esters production

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dc.contributor.authorMeireles, Cristiana Vanessa Brás
dc.contributor.authorQueiroz, Ana
dc.contributor.authorRibeiro, António E.
dc.contributor.authorBrito, Paulo
dc.date.accessioned2020-01-06T11:14:16Z
dc.date.available2020-01-06T11:14:16Z
dc.date.issued2018
dc.description.abstractDue to the massive use of energy from non-renewable sources, as well as to environmental problems, it is important to find green alternatives to energy production. In this context, biodiesel arises as a possible diesel substitute which can be produced using basic or acid catalysts. Despite these traditional catalysts allow high production yields, problems related to its use and the environmental impacts associated, result in the need to search for more sustainable alternatives. Ionic liquids (ILs), used as possible catalysts, represent an interesting alternative because they can be recovered and reused, being environmentally friendly. The kinetics of the esterification of free fatty acids (FFA) using oleic acid and methanol, and 1-buthyl-3-methylimidazolium methyl sulfate, [BMIM][MeSO4], IL as catalyst is presented. All kinetics measurements were carried out for 8 hours, with a catalyst quantity of 10% w/w, and a molar ratio oleic acid/methanol of 1:10, using four different reaction temperatures (60, 80, 100 and 110°C), under stirring, temperature control and reflux. Throughout the reaction, and at predetermined times (0, 15, 30, 60, 90, 120, 180, 240, 300, 360, 420 and 480 min), 1 mL of sample was collected from the reaction vessel. The acidity value, expressed in mg KOH/g biodiesel, was determined immediately after the sampling using the experimental procedure according to European Standard EN 14104. The conversion of oleic acid, in percentage, was estimated by comparing the initial and final acidity values. It was considered for the calculation of the initial acidity value, the sample collected at time 0 min. The integral method was applied considering 0th, 1st, 2nd and 3rd order kinetics relating to oleic acid, for all temperatures. Therefore, the coefficients of determination (R2) were compared and the order of reaction was selected taking into account the highest value attained. Finally, the Arrhenius theory was used to predict the activation energy value.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationMeireles, Cristiana; Queiroz, A.M.; Ribeiro, António E.; Brito, Paulo (2018). Kinetic study of the esterification process catalyzed by ionic liquids for fatty acid methyl esters production. In XXIV Encontro Luso-Galego de Química: livro de resumos. Porto. ISBN 978-989-8124-24-1pt_PT
dc.identifier.isbn978-989-8124-24-1
dc.identifier.urihttp://hdl.handle.net/10198/20127
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/pt_PT
dc.titleKinetic study of the esterification process catalyzed by ionic liquids for fatty acid methyl esters productionpt_PT
dc.typeconference object
dspace.entity.typePublication
oaire.citation.conferencePlacePortopt_PT
oaire.citation.titleXXIV Encontro Luso-Galego de Químicapt_PT
person.familyNameQueiroz
person.familyNameRibeiro
person.familyNameBrito
person.givenNameAna
person.givenNameAntónio E.
person.givenNamePaulo
person.identifier.ciencia-id2611-D40C-3472
person.identifier.ciencia-id3211-D5B0-870D
person.identifier.ciencia-idA31A-D845-A6E2
person.identifier.orcid0000-0003-4761-0618
person.identifier.orcid0000-0003-4569-7887
person.identifier.orcid0000-0003-1805-0252
person.identifier.ridO-8367-2015
person.identifier.scopus-author-id23390701300
person.identifier.scopus-author-id31168231800
rcaap.rightsopenAccesspt_PT
rcaap.typeconferenceObjectpt_PT
relation.isAuthorOfPublication508436a2-5db1-481e-9c48-eab160333d61
relation.isAuthorOfPublication52666376-f100-4407-87ef-dc5df3613761
relation.isAuthorOfPublication0370deac-dc4e-4b3d-8e1f-fc2d117794d2
relation.isAuthorOfPublication.latestForDiscovery508436a2-5db1-481e-9c48-eab160333d61

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