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Título
Thermodynamics of mixtures with strongly negative deviations from Raoult's law. XVII. Permittivities and refractive indices for alkan-1-ol + N,N-diethylethanamine systems at (293.15–303.15) K. Application of the Kirkwood-Fröhlich model
Autor
Año del Documento
2019
Editorial
Elsevier Ltd
Descripción
Producción Científica
Documento Fuente
The Journal of Chemical Thermodynamics 141 (2020) 105937
Abstract
Relative permittivities at 1 MHz, epsilon(r), at 0.1 MPa and (293.15–303.15) K and refractive indices, nD, at similar conditions have been measured for the alkan-1-ol (methanol, propan-1-ol, butan-1-ol, pentan-1-ol or heptan-1-ol) + N,N-diethylethanamine (TEA) systems. Positive values of the excess permittivities, epsilon(r)E, are encountered for the methanol system at high alcohol concentrations. The remaining mixtures are characterized by negative epsilon(r)E values over the whole composition range. At fi1 (volume fraction) = 0.5, epsilon(r)E changes in the order: methanol > propan-1-ol > butan-1-ol < pentan-1-ol < heptan-1-ol. Mixtures formed by alkan-1-ol and an isomeric amine, hexan-1-amine (HxA) or N-propylpropan-1-amine (DPA) or cyclohexylamine, behave similarly. This has been explained in terms of the lower and weaker self-association of longer alkan-1-ols. From the permittivity data, it is shown that: (i) (alkan-1-ol)-TEA interactions contribute positively to epsilon(r)E; (ii) TEA is an effective breaker of the network of the alkan-1-ols; (iii) structural effects, which are very important for the volumetric and calorimetric data of alkan-1-ol + TEA systems, are also relevant when evaluating dielectric data. This is confirmed by the comparison of epsilon(r)E measurements for alkan-1-ol + aliphatic amine mixtures; (iv) the aromaticity effect (i.e., the replacement of TEA by pyridine in systems with a given alkan-1-ol) leads to an increase of the mixture polarization. Calculations conducted in the framework of the Kirkwood-Fröhlich model are consistent with the previous statements.
Materias (normalizadas)
Termodinámica
Materias Unesco
2213 Termodinámica
2210.21 Equilibrio de Fases
2210.30 Soluciones
Palabras Clave
Alkan-1-ol
N,N-diethylethanamine
Permittivity
Refractive index
Kirkwood correlation factor
ISSN
0021-9614
Revisión por pares
SI
Patrocinador
Consejería de Educación, Junta de Castilla y León: Project VA100G19 (Apoyo a GIR, BDNS: 425389)
Ministerio de Educación, Cultura y Deporte (MECD): Grants FPU14/04104 and FPU15/05456
Ministerio de Educación, Cultura y Deporte (MECD): Grants FPU14/04104 and FPU15/05456
Idioma
eng
Tipo de versión
info:eu-repo/semantics/acceptedVersion
Derechos
openAccess
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