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Título
Liquid-liquid equilibria for (2-hydroxy benzaldehyde + n-alkane) mixtures. Intermolecular and proximity effects in systems containing hydroxyl and aldehyde groups
Autor
Año del Documento
2019
Editorial
Elsevier
Documento Fuente
The Journal of Chemical Thermodynamics, 2019, 135, 359-368
Abstract
The liquid-liquid equilibrium (LLE) curves have been determined for the {2-hydroxyl-benzaldehyde (salicylaldehyde, SAC) + CH3(CH2)nCH3} mixtures (n = 5,6,7,8,9). The equilibrium temperatures were determined observing, by means of a laser scattering technique, the turbidity produced on cooling when a second phase takes place. All the systems show an upper critical solution temperature, which linearly increases with n. Intermolecular effects have been investigated in (alkanol + benzaldehyde) systems using data from the literature. Interactions in 1-alkanol mixtures are mainly of dipolar type. The corresponding excess molar enthalpies, HmE , are large and positive, which reveal that interactions between like molecules are dominant. Interactions between unlike molecules are stronger for the methanol-containing system. For the other mixtures, the enthalpy of the 1-alkanol-benzaldehyde interactions remains more or less constant. At 298.15 K and equimolar composition, the replacement of a linear polar solvent by the isomeric aromatic one leads to increased HmE values in systems with a given 1-alkanol. The (phenol + benzaldehyde) system shows strongly negative deviations from the Raoult’s law. Proximity effects have been examined in (SAC + hydrocarbon) mixtures. Alkane-containing systems are essentially characterized by dipolar interactions, while dispersive interactions are prevalent in the solution with benzene. All the mixtures have been treated in terms of DISQUAC. The interaction parameters for the OH/CHO contacts and for the SAC/aromatic and SAC/alkane contacts have been reported. DISQUAC provides a correct description of the thermodynamic properties considered. In the case of SAC systems, this is done by defining a new specific group HO- C- C- CHO for salicylaldehyde.
Materias (normalizadas)
Termodinámica
Materias Unesco
2213 Termodinámica
ISSN
0021-9614
Revisión por pares
SI
Version del Editor
Idioma
spa
Tipo de versión
info:eu-repo/semantics/acceptedVersion
Derechos
openAccess
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