Abstract

HOLGUIN, Andrés R. et al. Rev. acad. colomb. cienc. exact. fis. nat. [online]. 2011, vol.35, n.136, pp.315-328. ISSN 0370-3908.

Molar volumes, excess molar volumes, and partial molar volumes were investigated for glycerol formal + ethanol mixtures by density measurements at several temperatures. Excess molar volumes are fitted by Redlich-Kister equation and compared with other systems. The system exhibits negative excess volumes probably due to increased H-bond interactions. Volume thermal expansion coefficients are also calculated. The Jouyban-Acree model was used for density and molar volume correlations at different temperatures. The mean relative deviations between experimental and calculated data were 0.03 ± 0.03% and 0.17 ± 0.13%, respectively for density and molar volume data. Also, using a minimum number of data points, the Jouyban-Acree model can predict density and molar volume with acceptable accuracies (0.03 ± 0.03% and 0.15 ± 0.12%, respectively).

Keywords : glycerol formal; ethanol; binary liquid mixtures; excess volumes; partial volumes; Jouyban-Acree model.

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