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Some Physicochemical Properties of Binary Mixtures of Glycerol with Butanol Isomers in the Temperature Range 293.15–318.15 K and Ambient Pressure

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journal contribution
posted on 2020-03-20, 14:59 authored by Yasmine Chabouni, Fouzia Amireche
The aim of this work is experimental determination of density, ρ, refractive index, nD, viscosity, η, and their derivatives for four binary systems containing glycerol in the mixture with butanol isomers: 1-butanol, 2-butanol, isobutanol, and tert-butanol. Experimental results were carried out for all concentration ranges at atmospheric pressure and at a temperature interval of 293.15–318.15 K except for the mixtures with tert-butanol because of high melting temperatures, so the measurements were made from 303 K. Results of experimental measurements were further used to estimate, for each investigated mixture, excess molar volumes, partial molar volumes, apparent molar volumes, thermal isobaric expansibilities, excess thermal expansibilities and partial molar volumes at infinite dilution, the viscosity deviations, and the excess energies of activation. In addition to that, the infrared spectra of all the systems have been recorded at three concentrations at room temperature. The excess molar volumes VE and excess thermal expansitivities for all investigated systems are found negative over the whole composition range and at all temperatures studied, and deviations from ideality increase with increasing temperature. Negative values of viscosity deviation appear for all systems, but contrary to the excess molar volumes, the deviations from ideality decrease with temperature rising. The excess molar calculated properties were well fitted using the empirical Redlich–Kister polynomial. All the properties measured and calculated in this work have shown a significant influence of the structure of the molecules including the size, shape, and the position of the hydroxyl groups of the components. As expected, the infrared spectra of these binary mixtures prepared with these four butanol isomers show strong hydrogen bonding capability.

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