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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.)

On the solid-liquid equilibrium of binary mixtures of fatty alcohols and fatty acids

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Author(s):
Maximo, Guilherme J. [1] ; Carareto, Natalia D. D. [1] ; Costa, Mariana C. [2] ; dos Santos, Adenilson O. [3] ; Cardoso, Lisandro P. [4] ; Kraehenbahl, Maria A. [5] ; Meirelles, Antonio J. A. [1]
Total Authors: 7
Affiliation:
[1] Univ Estadual Campinas, UNICAMP, Sch Food Engn, Lab Extract Appl Thermodynam & Equilibrium, BR-13083862 Campinas, SP - Brazil
[2] Univ Estadual Campinas, Sch Appl Sci, BR-13484350 Limeira, SP - Brazil
[3] Univ Maranhao, Social Sci Hlth & Technol Ctr, BR-65900410 Imperatriz, Maranhao - Brazil
[4] Univ Estadual Campinas, Inst Phys Gleb Wataghin IFGW, BR-13083859 Campinas, SP - Brazil
[5] Univ Estadual Campinas, Sch Chem Engn, DDPP, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 5
Document type: Journal article
Source: Fluid Phase Equilibria; v. 366, p. 88-98, MAR 25 2014.
Web of Science Citations: 29
Abstract

Fatty alcohols and fatty acids are used in the cosmetic, pharmaceutical and food industries as surfactants. They are also considered phase change materials for thermal storage processes. Information on their thermal properties is required for optimizing production processes as well as for improving their industrial and home use. In the present study, the solid-liquid phase diagrams of three binary systems of 1-tetradecanol + dodecanoic acid, 1-hexadecanol + tetradecanoic acid and 1-octadecanol + hexadecanoic acid were determined by differential scanning calorimetry. The phase-transition phenomena were further investigated by optical micrographs and X-ray diffraction patterns. The experimental data showed that the systems present eutectic transitions and some of them exhibit partial solid phase miscibility. The liquid phase activity coefficients were calculated by Margules 2 and 3-suffix and by UNIFAC and UNIFAC-Dortmund methods. The modeling approach resulted in an accurate prediction, with average absolute deviations from experimental data lower than 1.16 K. The values of excess Gibbs free energy present an unusual behavior, with positive deviations at very low alcohol concentrations and negative ones at high concentrations of this component. This occurs due to changes in the H-bonding interactions along the concentration range of the mixture. (C) 2014 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 09/54137-1 - Acquisition of a particle size/distribution analyzer, a zeta potential measurement system, a spray dryer, and an ultra-high-pressure liquid chromatograph/mass spectrometer
Grantee:Miriam Dupas Hubinger
Support Opportunities: Multi-user Equipment Program
FAPESP's process: 12/05027-1 - Solid-liquid equilibrium of fatty compounds and biodiesel flash point
Grantee:Mariana Conceição da Costa
Support Opportunities: Program for Research on Bioenergy (BIOEN) - Young Investigators Grants
FAPESP's process: 08/56258-8 - Phase equilibrium and purification processes in the production of biofuels and biocompounds
Grantee:Antonio José de Almeida Meirelles
Support Opportunities: Program for Research on Bioenergy (BIOEN) - Thematic Grants