Volumetric and acoustic study of 1,4-butanediol with 2-ethoxyethanol/2-butoxyethanol at various temperatures

Abstract

The speeds of sound, u and densities, ρ, of the blends, 1,4-butanediol (1,4-BD) with 2-ethoxy ethanol (2-EE) and 2-butoxyethanol (2-BE), including those of pure liquids, have been determined from 0 to 1 mol fraction range of 1,4-BD with interval 0.1 at 303.15 K to 318.15 K at pressure 0.1 MPa. We used the measured values to assess the excess molar volumes, VmE, excess isentropic compressibility, κsE, excess speeds of sound, uE, excess molar isentropic compressibility, Ks,mE, excess isobaric thermal expansion αpE, and the results were fitted with Redlich-Kister equation. The excess partial molar volumes and isentropic compressibilities of the components at infinite dilution have also been measured. The departure of measured properties has been explored in terms of intermolecular interactions. Moreover, the theoretical ultrasonic speeds are computed based on the scaled particle theory and compared with the experimentally measured values.