Thermodynamic Equilibrium and Reaction Kinetics for the Esterification of Lactic Acid with Ethanol Catalyzed by acid ion exchange resin

• Tipo: Artigo em Revista Científica Internacional
• Data: 2008

Autores

Carla S. M. Pereira (Autor) Outra; Simão P. Pinho (Autor) Outra; Viviana M. (Autor) FEUP; Alírio E. Rodrigues (Autor) FEUP

Revista

Título: Industrial & Engineering Chemistry Research

Vol. 47 Nº 5

Páginas: 1453-1463

ISSN: 0888-5885

Editora: American Chemical Society

Indexação

ISI Web of Knowledge - 30 Citações

ISI Web of Science

Scopus - 35 Citações

COMPENDEX

Classificação Científica

FOS: Ciências da engenharia e tecnologias

CORDIS: Ciências Tecnológicas > Engenharia > Engenharia química

Outras Informações

ID Authenticus: P-004-0XV

DOI: 10.1021/ie071220p

Abstract (EN): 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 degrees 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 = k(c)(aE(th)a(La) - a(EL)a(w)/K)/(1 + K(Eth)a(Eth) + K(w)a(w))(2); the kinetic parameters are the preexponential factor, k(c,0) = 2.70 x 10(7) mol.g(-1).min(-1), and the activation energy, E-a = 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica