Thermal and Volumetric Properties of Some C5 and C6 Alkanones at Infinite Dilution in Water

Abstract

Precise measurements of excess enthalpies and densities of highly dilute aqueous solutions of five C5−C6 alkanones (namely 2-pentanone, 3-pentanone, 3-methyl-2-butanone, 2-hexanone, and 4-methyl-2-pentanone) were carried out using tandem flow mixing calorimetry and vibrating-tube densimetry. The experimental data obtained in the temperature range from 288.15 to 318.15 K were utilized for the evaluation of limiting partial molar excess enthalpies, partial molar volumes, and partial molar excess volumes of the alkanones in water. Within the temperature range studied, these infinite dilution properties were found to exhibit linear trends. As inferred from respective linear fits, partial molar excess heat capacities, partial molar expansions, and excess partial molar expansions were obtained with a good accuracy. Moreover, hydration enthalpies and heat capacities of the alkanones studied were evaluated, too. The thermodynamic behavior of the alkanone solutes was discussed in terms of molecular interactions and shown to be closely correlated with that for equi-structured alkanol solutes.

Thermal and Volumetric Properties of Five Lactones at Infinite Dilution in Water

“…As concerns the infinite dilution partial molar expansion E ̅ 1 ∞ , its values are, in accord with expectation, positive and show no special variation within the group of lactones studied, except perhaps the increasing trend in the sequence GBL < GVL < GHL, that is, with the alkylation of the lactone ring. The excess values E ̅ 1 E,∞ are all appreciably positive, in contrast with those for recently studied C5 and C6 alkanones for which V ̅ 1 E,∞ gets more negative as temperature increases.…”

“…Being engaged in systematic measurements of these properties over more than two decades, we have furnished a bulk of reliable data involving many classes of VOCs. For their overview and pertinent references we refer the reader to our recent article dealing with alkanones . In this work, which is a follow-up to the series, we focus on lactones.…”

“…For their overview and pertinent references we refer the reader to our recent article dealing with alkanones. 1 In this work, which is a follow-up to the series, we focus on lactones.…”

Air–Water Partitioning of C5 and C6 Alkanones: Measurement, Critical Compilation, Correlation, and Recommended Data

“…As a result, we have reported a decent bulk of reliable measurements on respective phase equilibria as well as thermal and volumetric behavior and established recommended data for a large number of VOCs of various classes including aromatic and halogenated hydrocarbons, oxygen derivatives (alkanols, phenols, ethers, ketones, esters, and lactones), nitrogen derivatives (nitriles, nitrocompounds, amines, and amides), and others. In one of our recent papers, 1 we have dealt with some C5 and C6 alkanones and reported their various thermal and volumetric properties at infinite dilution in water. The present communication is a follow-up focusing on air−water partition coefficients K aw of the C5 and C6 alkanones and their limiting activity coefficients γ 1 ∞ in water, which we study as a function of temperature.…”