Activity coefficient at infinite dilution measurements for organic solutes (polar and non-polar) in fatty compounds - Part II: C18 fatty acids

Autor(es)

Belting, Patricia Castro ^{[1, 2]} ; Rarey, Juergen ^[2] ; Gmehling, Juergen ^[2] ; Ceriani, Roberta ^[3] ; Chiavone-Filho, Osvaldo ^[4] ; Meirelles, Antonio J. A. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Fac Food Engn, Dept Food Engn, BR-13083862 Campinas, SP - Brazil

^[2] Carl von Ossietzky Univ Oldenburg, Tech Chem FK V, D-26111 Oldenburg - Germany

^[3] Univ Estadual Campinas, Fac Chem Engn, BR-13083852 Campinas, SP - Brazil

^[4] Univ Fed Rio Grande do Norte, Dept Chem Engn, BR-59066800 Natal, RN - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF CHEMICAL THERMODYNAMICS; v. 60, p. 142-149, MAY 2013.
• Citações Web of Science: 4

Resumo

In this work, activity coefficients at infinite dilution (gamma(infinity)(13)) have been measured for 21 solutes (subscript 1) (alkanes, cycloalkanes, alkenes, aromatic compounds, alcohols, esters, ketones, and halogenated hydrocarbons), in four solvents (subscript 3), namely one saturated fatty acid and three unsaturated fatty acids: stearic (octadecanoic) acid - C18:0, oleic (cis-9-octadecenoic) acid -C18:1 9c, linoleic (cis, cis-9,12-octadecadienoic) acid - C18:2 9c12c, and linolenic (cis, cis, cis-9,12,15-octadecatrienoic) acid - C18:3 9c12c15c, by gas-liquid chromatography. The measurements were carried out at temperatures from (303.13 to 368.19) K and the partial molar excess Gibbs free energy (Delta G(1)(E,infinity)), enthalpy (Delta H-1(E,infinity)), and entropy (Delta S-1(E,infinity)), at infinite dilution were calculated from experimental gamma(infinity)(13) values obtained over the temperature range. The uncertainties in determination of gamma(infinity)(13) and Delta H-1(E,infinity) are 4% and 20%, respectively. The results for stearic acid obtained in this study have been compared to those available in the Dortmund Data Bank (DDB). The real behaviour of fatty systems could be better understood through the results obtained in this work. (C) 2013 Published by Elsevier Ltd. (AU)

• Processo FAPESP: 10/16634-0 - Processos de separação por esgotamento na indústria de óleos e gorduras
• Beneficiário: Roberta Ceriani
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• 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
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• 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