Abstract

CANZONIERI, Salvador H. et al. Efecto de la temperatura sobre las propiedades acústicas y volumétricas de mezclas binarias líquidas de Propanonitrilo y Propanoato de Metilo, y de Propanonitrilo y Propanoato de Etilo. Rev. Bol. Quim [online]. 2021, vol.38, n.4, pp.168-181. ISSN 0250-5460.  https://doi.org/10.34098/2078-3949.38.4.4.

The densities (ρ) and speeds of sound (u) of binary liquid mixtures formed by propanonitrile + methyl propanoate and propanonitrile + ethyl propanoate, including those of the pure liquids, at a temperature range from 278.15 K to 318.15 K every 5 K are reported in this paper. The density and speed of sound were measured over the complete composition range at the atmospheric pressure. The experimental data were used to calculate the molar volume V (x, T), excess molar volume VE (x, T), the deviation in speed of sound Δu (x, T), the isoentropic compressibility Ks (x, T), the excess isoentropic compressibility KE S (x, T), the thermal expansion coefficient α (x, T) and the excess thermal expansión coeffi-cient αE (x, T). Every set of results of the properties of the excess was fitted to a polynomial equation like the Redlich-Kister equation (1), the deviations obtained were of the order of experimental error. The excess values of the mixtures studied were negative for the entire composition range and all temperatures. The results have been discussed in terms of molecular interactions and structural effects. The models proposed by Nomoto (2),(3), Van Dael (4) y Ernst et al. (5) were used to calculate the speed of sound at 298.15 K.

Keywords : Propanonitrile; Methyl propanoate; Ethyl propanoate; Excess molar volumen; Excess isoentropic compressibility; Speed of sound; Thermal expansion coefficient.

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