Resumo

RODRIGUEZ, Gerson A. et al. Volumetric properties of some pharmaceutical binary mixtures at low temperatures and correlation with the Jouyban-Acree model. Rev. colomb. cienc. quim. farm. [online]. 2011, vol.40, n.2, pp.222-239. ISSN 0034-7418.

Excess molar volumes and partial molar volumes were investigated from density values for a) ethanol (1) + water (2), b) 1,2-propanediol (1) + water (2), and c) ethanol (1) + 1,2-propanediol (2) mixtures, at temperatures from (278.15 to 288.15) K. Excess molar volumes were fitted by Redlich-Kister equation. The systems exhibit negative excess volumes probably due to increased interactions like hydrogen bonding and/or large differences in molar volumes of components. The Jouyban-Acree model was used for density and molar volume correlations of the studied mixtures at different temperatures. The mean relative deviations between experimental and calculated data in density data were 0.15, 0.08, and 0.01 %, for a), b), and c), respectively; whereas, in molar volume data the values were 1.9, 2.1, and 0.1 %, for a), b), and c), respectively.

Palavras-chave : ethanol; 1,2-propanediol; water; binary liquid mixtures; density; excess volume; Jouyban-Acree model.

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