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Abstract
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Densities were measured for binary mixtures of isobutanol with 1-alkanols, namely: methanol, ethanol, 1-propanol, 1-butanol, 1-pentanol and 1-hexanol at the temperatures of (288.15, 298.15 and 308.15) K and ambient pressure. Excess molar volumes, VEm , thermal expansion coefficients a, excess thermal expansion coefficients aE, and isothermal coefficients of pressure excess molar enthalpy, ðvHEm =vPÞ T;x, were derived from the experimental data and the computed results were fitted to the RedlicheKister equation. The PengeRobinsoneStryjekeVera (PRSV) equation of state was applied, in combination with simple mixing rules to predict the excess molar volume. The VEmresults were positive for the mixtures of isobutanol with methanol, ethanol, 1-propanol, 1-butanol, and negative for isobutanol with 1-pentanol and 1-hexanol over the whole composition range. The results showed very small deviations from the behavior of ideal solutions in these mixtures and were analyzed to discuss the nature and strength of intermolecular interactions.
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