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Author(s): Rui P. V. Faria
Carla S. M. Pereira
Viviana M. T. M. Silva
José M. Loureiro
Alírio E. Rodrigues
Title: Glycerol valorization as biofuel: Thermodynamic and kinetic study of the acetalization of glycerol with acetaldehyde
Issue Date: 2013
Abstract: The work reported in this article is a thermodynamic and kinetic study of the acetalization reaction between acetaldehyde and glycerol to produce glycerol ethyl acetal (GEA). A catalyst screening was performed allowing for the choice of Amberlyst-15 wet resin as the most suitable catalyst for this reaction. Through the study of the reaction thermodynamic equilibrium, it was possible to determine the value of the equilibrium constant as a function of temperature, ln(K) = 1.419 + 1055/T, and the corresponding thermodynamic parameters Delta H-298 K(0) = -8.77 kJ.mol(-1) and Delta G(298 K)(0) = -12.3 kJ.mol(-1). Additionally, the standard enthalpy and Gibbs free energy of formation of GEA were also obtained, as -584.4 and -387.0 kJ.mol(-1), respectively. The Langmuir-Hinshelwood-Hougen-Watson model considering internal mass-transfer limitations presented the best fitting of the reaction kinetic behavior. The parameters estimated for this model were kc (mol.g(cat)(-1).s(-1)) = 3.13 x 10(9) - 6223/T and K-S,K-W = 1.82 x 10(-3) exp(2361/T). The acetalization of glycerol with acetaldehyde presents an activation energy of 51.7 kJ.mol(-1).
Subject: Engenharia química, Engenharia química
Chemical engineering, Chemical engineering
Scientific areas: Ciências da engenharia e tecnologias::Engenharia química
Engineering and technology::Chemical engineering
Related Information: info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Projetos Estratégicos/PEst-C/EQB/LA0020/2013/PROJECTO ESTRATÉGICO - LA 20 - 2013-2014/LA 20
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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