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Orientador(es)
Resumo(s)
The 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.
Descrição
Palavras-chave
Esterification Thermodynamics Kinetics Catalyst
Contexto Educativo
Citação
Pereira, 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.1453-1463
Editora
ACS