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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Experimental determination of the (vapor plus liquid) equilibrium data of binary mixtures of fatty acids by differential scanning calorimetry

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Author(s):
Matricarde Falleiro, Rafael M. [1] ; Meirelles, Antonio J. A. [2] ; Krahenbuhl, Maria A. [1]
Total Authors: 3
Affiliation:
[1] Univ Campinas UNICAMP, Sch Chem Engn, DPQ, LPT, BR-13083970 Campinas, SP - Brazil
[2] Univ Campinas UNICAMP, DEA, EXTRAE, Sch Food Engn, BR-13083862 Campinas, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: JOURNAL OF CHEMICAL THERMODYNAMICS; v. 42, n. 1, p. 70-77, Jan. 2010.
Field of knowledge: Agronomical Sciences - Food Science and Technology
Web of Science Citations: 14
Abstract

(Vapor + liquid) equilibrium (VLE) data for three binary mixtures of saturated fatty acids were obtained by differential scanning calorimetry (DSC). However, changes in the calorimeter pressure cell and the use of hermetic pans with holes ( = 250 mm) in the lids were necessary to make it possible to apply this analytical technique, obtaining accurate results with smaller samples and shorter operational times. The systems evaluated in this study were: myristic acid (C14:0) + palmitic acid (C16:0), myristic acid (C14:0) + stearic acid (C18:0), and palmitic acid (C16:0) + stearic acid (C18:0), all measured at 50 mm Hg and with mole fractions between 0.0 and 1.0 in relation to the most volatile component of each diagram. The fugacity coefficients for the components in the vapor phase were calculated using the Hayden and O’Connell method [J.G. Hayden, J.P. O’Connell, Ind. Eng. Chem. Process Design Develop. 14 (3) (1975) 209–216] and the activity coefficients for the liquid phase were correlated with the traditional gE models (NRTL [H. Renon, J.M. Prausnitz, Aiche J. 14 (1968) 135–144], UNIQUAC [D.S. Abrams, J.M. Prausnitz, Aiche J. 21 (1975) 116–128], and Wilson [J.M. Prausnitz, N.L. Linchtenthaler, E.G. Azevedo, Molecular Thermodynamics of Fluid-phase Equilibria, River-Prentice Hall, Upper Saddle, 1999]). The sets of parameters were then compared in order to determine which adjustments best represented the VLE. (AU)

FAPESP's process: 05/53095-2 - Phase equilibrium and separation processes of fatty and aqueous food solutions
Grantee:Antonio José de Almeida Meirelles
Support Opportunities: Research Projects - Thematic Grants