Ultrasound speed study of the ternary liquid mixture (water + ethanol + 1-propanol) at T = 293.15 K and P = 0.1 MPa

• Published in: The Journal of chemical thermodynamics 2020-11, Vol.150, p.106226, Article 106226
• Main Authors: Nobre, Luís C.S., Cristino, Ana F., Santos, Ângela F.S., Nieto de Castro, Carlos A., Lampreia, Isabel M.S.
• Format: Article
• Language: English
• Subjects: 1-Propanol; Aqueous ternary and binary liquid mixtures; Ethanol; Excess partial molar isentropic compressions; Molecular interactions; Sound speed
• ISSN: 0021-9614; 1096-3626
• DOI: 10.1016/j.jct.2020.106226

[Display omitted] •New sound speed data of the ternary {water + ethanol + 1-propanol} mixtures.•Use of Cibulka equation to fit excess molar isentropic compressions.•Higher impact of 1-propanol in the packing effect in the ternary mixture.•1-Propanol shifts the hydrophobic/hydrophilic balance to the hydrophobic side.•Transfer functions of the alcohols from the binary to the ternary mixtures. Sound speed measurements in 42 ternary aqueous mixtures of ethanol plus 1-propanol and new measurements in the three binary mixtures, composed by the three same components, were made at T = 293.15 K and P = 0.1 MPa. Following the volumetric study recently published, a compressibility analysis is now presented in order to complement our previous work, mainly based on derived properties such as excess partial molar isentropic compressions of the three components and their limiting values. As far as we know curves for limiting excess partial molar isentropic compressions of the i component in the ternary mixture were derived for the first time. Transfer functions of these limiting values when water and alcohol molecules are transferred from the aqueous binary to the ternary mixture, are presented and interpreted in terms of hydrophobic hydration and H-bonding effect.