Volumetric and sound speed study of aqueous 1-butanol liquid mixtures at different temperatures

• Published in: The Journal of chemical thermodynamics 2019-07, Vol.134, p.127-135
• Main Authors: Cristino, Ana F., Nobre, Luís C.S., Bioucas, Francisco E.B., Santos, Ângela F.S., Nieto de Castro, Carlos A., Lampreia, Isabel M.S.
• Format: Article
• Language: English
• Subjects: Aqueous solutions; Density; Hydration; Intermolecular interactions; Ultrasound speed; Water + 1-butanol liquid mixtures
• ISSN: 0021-9614; 1096-3626
• DOI: 10.1016/j.jct.2019.03.006

[Display omitted] •Densities and ultrasound speeds of 24 aqueous mixtures of 1-butanol were experimentally determined.•Excess molar and partial molar volumes, isentropic compressions and isobaric expansions were derived.•Different sensitivities were detected in the water very-rich region regarding volumes and isentropic compressions.•Limiting partial molar properties were interpreted in terms of hydration features. Simultaneous measurements of density and sound speed, at five temperatures, T = (283.15–303.15) K and pressure, P = 0.1 MPa within the miscible composition range were performed in 24 aqueous liquid mixtures of 1-butanol. Composition and temperature effects on different excess molar, and excess partial molar properties such as volume, isobaric expansion and isentropic compression are analysed, in terms of different changes in the hydration and association patterns, across the composition ranges studied. Comparison of the different thermodynamic properties, derived for this system, with those for two aqueous system of smaller number of carbon atoms is made. Limiting excess partial molar volumes, isobaric expansions and isentropic compressions at both ends of the composition range are presented. Limiting partial molar isentropic compression values for 1-butanol, infinitely diluted in water, compare very well with values calculated by the group contribution scheme previously presented by some of us.