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Thermodynamic equilibrium and reaction kinetics for the esterification of lactic acid with ethanol catalyzed by acid ion-exchange resin

2008Journal article Restricted access
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dc.contributor.authorPereira, Carla
dc.contributor.authorPinho, Simão
dc.contributor.authorSilva, Viviana
dc.contributor.authorRodrigues, Alírio
dc.date.accessioned2010-01-27T16:05:13Z
dc.date.available2010-01-27T16:05:13Z
dc.date.issued2008
dc.description.abstractThe heterogeneous catalysis of lactic acid (88 wt %) esterification with ethanol in the presence of Amberlyst 15-wet was studied for catalyst loading of 1.2-3.9 wt %, initial molar ratio of reactants of 1.1-2.8, and temperature from 50 to 90 °C. In this work a methodology based on the UNIQUAC model was developed to determine the thermodynamic equilibrium constant since in the literature there is inconsistency concerning the temperature dependence of the thermodynamic equilibrium constant. A simplified Langmuir-Hinshelwood kinetic model was used to predict the experimental data. The proposed rate law is r ) kc(aEthaLa - aELaW/ K)/(1 + KEthaEth + KWaW)2; the kinetic parameters are the preexponential factor, kc,0 ) 2.70 107 molâg-1âmin-1, and the activation energy, Ea ) 49.98 kJ/mol. The equilibrium reaction constant is K ) 19.35 exp(-515.13/T (K)) with reaction enthalpy 4.28 kJ/mol. The model reasonably predicts the kinetic experimental data, and it will be very useful to apply to the design and optimization of industrial hybrid reactive separation processes.pt
dc.identifier.citationPereira, Carla; Pinho, Simão; Silva, Viviana; Rodrigues, Alírio (2008). Thermodynamic equilibrium and reaction kinetics for the esterification of lactic acid with ethanol catalyzed by acid ion-exchange resin. Industrial Engineering Chemistry Research. ISSN 1520-5045. 47:5 issue 47(5), p.1453-1463pt
dc.identifier.doi10.1021/ie071220p
dc.identifier.issn1520-5045
dc.identifier.urihttp://hdl.handle.net/10198/1493
dc.language.isoengpt
dc.publisherACSpt
dc.subjectEsterificationpt
dc.subjectThermodynamicspt
dc.subjectKineticspt
dc.subjectCatalystpt
dc.titleThermodynamic equilibrium and reaction kinetics for the esterification of lactic acid with ethanol catalyzed by acid ion-exchange resinpt
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage1463pt
oaire.citation.issue47 (5)pt
oaire.citation.startPage1453pt
oaire.citation.titleIndustrial Engineering Chemistry Researchpt
person.familyNamePereira
person.familyNamePinho
person.givenNameCarla
person.givenNameSimão
person.identifier1415151
person.identifier810882
person.identifier.ciencia-idEF10-2739-2B70
person.identifier.ciencia-id481D-73AD-8D0F
person.identifier.orcid0000-0003-0093-771X
person.identifier.orcid0000-0002-9211-857X
person.identifier.ridK-1629-2016
person.identifier.ridD-4148-2013
person.identifier.scopus-author-id55627876424
person.identifier.scopus-author-id7003570175
rcaap.rightsrestrictedAccesspt
rcaap.typearticlept
relation.isAuthorOfPublicatione07a8e12-52bb-47c5-bae7-41a5f648213b
relation.isAuthorOfPublication8ef7789a-34f3-4915-a666-4efe26272a30
relation.isAuthorOfPublication.latestForDiscovery8ef7789a-34f3-4915-a666-4efe26272a30

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