Liquid-liquid equilibrium of fatty systems: A new approach for adjusting UNIFAC interaction parameters

Autor(es)

Hirata, Glaucia F. ^[1] ; Abreu, Charlles R. A. ^[2] ; Bessa, Larissa C. B. A. ^[1] ; Ferreira, Marcela C. ^[1] ; Batista, Eduardo A. C. ^[1] ; Meirelles, Antonio J. A. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, UNICAMP, Fac Food Engn FEA, EXTRAE, Dept Food Engn DEA, BR-13083970 Campinas, SP - Brazil

^[2] Univ Fed Rio de Janeiro, Sch Chem, BR-21941909 Rio De Janeiro, RJ - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Fluid Phase Equilibria; v. 360, p. 379-391, DEC 25 2013.
• Citações Web of Science: 20

Resumo

Along the refining process of vegetable oils the removal of free fatty acids is the most important purification step. The deacidification by liquid-liquid extraction using an alcoholic solvent has been shown to be a viable alternative from a technical point of view. In prior studies reported in the literature, the equilibrium data were determined and correlated for each different type of edible oil and they are most often represented in terms of mass fractions of pseudocomponents. However, to obtain a better predictive tool, it is necessary to consider the true compositions of these mixtures. In this work, several data for real multicomponent systems available in the literature were used to readjust group interaction parameters of the UNIFAC (Universal Quasi-Chemical Functional-group Activity Coefficients) method. A new group has also been proposed in order to simplify the description of the triacylglycerols. The deviations found using the original groups and parameters of UNIFAC were considerably higher than the deviations found in both alternative procedures, indicating that the correlation and prediction of this type of systems were significantly improved. The developed procedures were further tested using data measured for two validation systems, which confirmed the improvement in the predictive power of the UNIFAC method. (C) 2013 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 09/54137-1 - EMUS: aquisição de um analisador de distribuição de tamanho de partículas, um medidor de potencial zeta, um spray dryer e um sistema de cromatografia líquida de ultra alta pressão / espectrômetro de massa
• Beneficiário: Miriam Dupas Hubinger
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários
• Processo FAPESP: 08/56258-8 - Phase equilibrium and purification processes in the production of biofuels and biocompounds
• Beneficiário: Antonio José de Almeida Meirelles
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - Temático