Thermodynamics of ternary mixtures with gasoline additive: Volumetric, acoustic and optical properties

• Published in: Journal of molecular liquids 2020-04, Vol.304, p.112740, Article 112740
• Main Authors: Gahlyan, Suman, Bhagat, Payal, Devi, Rekha, Verma, Sweety, Rani, Manju, Maken, Sanjeev
• Format: Article
• Language: English
• Subjects: DIPE; Gasoline additives; Intermolecular interactions; Prigogine-Flory-Patterson theory; Ternary mixtures; Thermophysical properties
• ISSN: 0167-7322; 1873-3166
• DOI: 10.1016/j.molliq.2020.112740

Excess molar volume (VmE), deviation in ultrasonic speed (Δu) and deviation in refractive index (Δn) of ternary mixtures with gasoline additives diisopropyl ether (DIPE) + benzene + n-heptane were derived from the measured density, ultrasonic speed and refractive index with Anton Paar vibrating tube densimeter, sound analyzer and Abbemat 200 refractometer, respectively at different temperature of 298.15 K, 308.15 K and 318.15 K and atmospheric pressure. The VmE values for the ternary mixtures were predicted using pragmatic equations and geometrical solution models employing constituent binary data. The VmE have also been interpreted using Prigogine-Flory-Patterson theory. The ultrasonic speed data was analyzed using like Nomato, van Dael, impedance dependence correlations and CFT theory at 298.15 K. Jacobson free length theory was employed to compute LfE and VaE at 298.15 K. The refractive indices of the ternary mixtures were also predicted using various mixing rules. The VmE,Δu, KSE and Δn derived values were also fitted to the Singh equation. •Density, ultrasonic speed and refractive index for DIPE (1) + benzene (2) + n-heptane (3) mixtures reported•Addition of n-heptane disrupts the intermolecular interactions in DIPE + benzene mixture.•Ultrasonic speed data was used to compute excess isentropic compressibility.•Schaaff's collision factor and Jacobson's free length theory were applied.•Excess volume was interpreted in terms of four geometrical solution model as well as PFP theory.