Abstract

The correlation between the limiting value of the activity coefficient of various liquids in alcohols and the hydrogen-bond shift of the hydroxyl group in infrared spectra for binary solutions containing propanols or butanols is discussed. Based on this correlation and a thermodynamic consideration, azeotrope diagrams are prepared for each alcohol. This correlation is combined with the regular solution equations to give the expression for azeotropic temperature and composition. Extensive comparison with literature values indicates that the diagrams are useful for the prediction of azeotrope formation in binary alcohol solutions and that the azeotropic temperature and composition can be predicted with average errors of ± 1.3°C and ± 6.6 wt %, respectively.

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