Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

Densities and speeds of sound for binary mixtures of 1,2-ethanediol with three alkanols (2-ethyl-1-hexanol, 1-heptanol, or ethanol) were measured over the entire composition range in the temperature 298.15 K by means of a vibrating-tube densimeter and pulse-echo-overlap method. Density measurements were also made for mixtures of 1,2-ethanediol with 1-nonanol at the temperatures (293.15 and 298.15) K. From these data, the excess molar volumes and excess molar isentropic compressibilities as well as the deviations of speed of sound were calculated and approximated by the Redlich-Kister polynomials. The negative values of the excess molar volumes and isentropic compressibilities over the entire composition range are observed only in the case of ethanol. In the cases of 2-ethyl-1-hexanol, 1-heptanol, and 1-nonanol, the positive values of the excess molar volumes over the entire composition range are observed. Simultaneously, the negative values of the excess molar isentropic compressibilities over the entire composition range are observed for 2-ethyl-1-hexanol and 1-heptanol.