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Advisor(s)
Abstract(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.
Description
Keywords
Esterification Thermodynamics Kinetics Catalyst
Citation
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
Publisher
ACS