RT info:eu-repo/semantics/article
T1 Liquid-liquid equilibria for (2-hydroxy benzaldehyde + n-alkane) mixtures. Intermolecular and proximity effects in systems containing hydroxyl and aldehyde groups
A1 González López, Juan Antonio Mariano
A1 Alonso-Tristán, Cristina
A1 Hevia de los Mozos, Luis Fernando
A1 Sanz del Soto, Luis Felipe
A1 García de la Fuente, Isaías Laudelino
K1 Termodinámica
K1 2213 Termodinámica
AB 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.
PB Elsevier
SN 0021-9614
YR 2019
FD 2019
LK https://uvadoc.uva.es/handle/10324/69157
UL https://uvadoc.uva.es/handle/10324/69157
LA spa
NO The Journal of Chemical Thermodynamics, 2019, 135, 359-368
DS UVaDOC
RD 28-nov-2024