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Título
Orientational effects in mixtures of organic carbonates with alkanes or 1-alkanols
Autor
Año del Documento
2017
Editorial
Elsevier
Documento Fuente
Fluid Phase Equilibria, 2017, 449, 91-103
Abstract
Interactions and structure of organic carbonate + alkane, and 1-alkanol + organic carbonate mixtures have been investigated by means of a set of molar excess functions, enthalpies (H_m^E), volumes (V_m^E), isobaric heat capacities, (C_pm^E) or entropies; and considering internal pressure (P_int); liquid-liquid equilibria or permittivity data. In addition, the mentioned systems have been studied using the Flory model and the concentration-concentration structure factor,S_CC (0), formalism. The mixtures under consideration are characterized by dipolar interactions and by homocoordination (that is, by interactions between like molecules). In systems with a given solvent, dipolar interactions are weakened in the order: propylene carbonate (PC) > dimethyl carbonate (DMC) > diethyl carbonate (DEC). Comparison of mixtures containing DMC or DEC with those involving 2-propanone or 3-pentanone shows that dipolar interactions are not determined merely by values of the dipole moment, but they also depend on the size group. The enthalpies of the alkanol-carbonate interactions have been evaluated from calorimetric data. They are stronger in DMC solutions, and become weaker when the alcohol size increases in mixtures with a given carbonate. Application of the Flory model to 43 systems of the type 1-alkanol + carbonate provides a mean relative standard deviation for H_m^E equal to 0.107. Results reveal that orientational effects decrease in the order DEC > PC > DMC. Orientational effects are particularly relevant in methanol or ethanol + DEC mixtures. Interestingly, the mentioned effects are weaker in 1-alkanol + DMC mixtures than in DMC + alkane systems. A similar trend is observed in DEC solutions when the considered alcohol is longer than ethanol.
Materias (normalizadas)
Termodinámica
Materias Unesco
2213 Termodinámica
ISSN
0378-3812
Revisión por pares
SI
Patrocinador
Junta de Castilla y León Regional Grant BU034U16
Ministerio de Educación, Cultura y Deporte (MECD): Grant FPU14/04104
Ministerio de Educación, Cultura y Deporte (MECD): Grant FPU14/04104
Version del Editor
Idioma
spa
Tipo de versión
info:eu-repo/semantics/submittedVersion
Derechos
openAccess
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