Effect of temperature on density, sound velocity, and their derived properties for the binary systems glycerol with water or alcohols

• Published in: The Journal of chemical thermodynamics Vol. 109; pp. 124 - 136
• Main Authors: Negadi, Latifa, Feddal-Benabed, Badra, Bahadur, Indra, Saab, Joseph, Zaoui-Djelloul-Daouadji, Manel, Ramjugernath, Deresh, Negadi, Amina
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-06-2017
• Subjects: Biomass; Density; Glycerol; Intermolecular interaction; Sound velocity; Intermolecular interaction; Glycerol; Biomass; Density; Sound velocity
• ISSN: 0021-9614; 1096-3626
• DOI: 10.1016/j.jct.2017.01.011

•Densities (ρ) and sound velocities (u) for glycerol, +water, +methanol, or +ethanol systems were measured.•The derived properties (excess molar volume, isentropic compressibility and deviation in isentropic compressibility) were calculated.•The Redlich–Kister polynomial was used to fit the experimental results.
Densities and sound velocities of three binary systems containing glycerol+(water, methanol, or ethanol) have been measured over the entire composition range at temperatures ranging from (283.15 to 313.15) K in 10K intervals, at atmospheric pressure. A vibrating u-tube densimeter and sound velocity analyzer (Anton Paar DSA 5000M) was used for the measurements. Thermodynamic properties were derived from the measured data, viz. excess molar volume, isentropic compressibility, and deviation in isentropic compressibility. The property data were correlated with the Redlich-Kister polynomial. In all cases, the excess molar volumes and deviation in isentropic compressibility are negative over the entire composition range for all binary mixtures studied and become increasingly negative with an increase in the temperature. These properties provide important information about different interactions that take place between like-like, like-unlike and unlike-unlike molecules in the mixtures.