Thermodynamics of Mixing Tetrahydrofuran with 1-Alkanols and Excess Enthalpies of Homomorphy-Related Systems

Abstract

Densities, F, and volumetric heat capacities, C p /V, have been measured at 298.15 K over the whole mole fraction range for the binary mixtures {tetrahydrofuran + methanol, + ethanol, + 1-propanol, + 1-butanol, + 1-hexanol, + 1-heptanol, + 1-octanol, + 1-nonanol, or + 1-decanol}. From experimental data, the excess molar isobaric heat capacities, C p E , were calculated. Excess molar volumes, V E , are reported for the systems containing methanol and 1-decanol. The apolar homomorph concept has been used in semiquantitative calculations intended to assess and to compare the degrees of heteroassociation in these mixtures by getting an approximation to the corresponding negative enthalpic contributions at equimolar fraction, H int . With this aim, excess molar enthalpies, H E , of {tetrahydrofuran + nonane} and {cyclopentane + 1-butanol, + 1-pentanol, + 1-hexanol, + 1-heptanol, + 1-octanol, + 1-nonanol, or + 1-decanol} have been measured at 298.15 K. The results are discussed in terms of molecular interactions. Particularly, the various steps of W-shape concentration dependence found in the C p E point to the occurrence of local nonrandomness in {THF + alkanol} mixtures.

Densities and Viscosities of Binary Mixtures of Cyclopropanecarboxylic Acid with Methanol, Ethanol, Propan-1-ol, and Butan-1-ol at Different Temperatures

“…On the other hand, alcohols are self-associated through hydrogen bonding, and this association decreases with an increase in molar mass of alkanols. In the last decades, much work has been devoted to studying the deviations from ideality for binary liquid mixtures containing a 1-alkanol and a second component. − A survey of the literature shows that there is no report on the densities and viscosities for cyclopropanecarboxylic acid with different alkanols.…”

“…In the last decades, much work has been devoted to studying the deviations from ideality for binary liquid mixtures containing a 1-alkanol and a second component. [9][10][11][12] A survey of the literature shows that there is no report on the densities and viscosities for cyclopropanecarboxylic acid with different alkanols.…”

Comments on ‘Prediction of internal pressure of binary liquid mixtures using Flory's statistical theory’

“…The required densities or excess molar volumes at different temperatures, and speeds of sound and isochoric heat capacities (C P ) or their excess values (C E P ) were taken from the work of the present authors 9,12,27-29 and from the literature. 11,[30][31][32][33][34][35][36][37][38][39][40] In the absence of direct experimental C E P data, these were derived from the temperature coefficients of excess molar enthalpy (C E P = ΔH E /ΔT). We could not find α p or α E P for the acetonitrile + DMF mixture.…”