Thermochemistry of Solutions of Alkanes in Binary Mixtures: Azeotropes
| Autor: | Artashes A. Khachatrian, Aydar A. Akhmadiyarov, Ilnaz T. Rakipov, Aliya R. Fakhurtdinova, Boris N. Solomonov, Artem A. Petrov |
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| Rok vydání: | 2020 |
| Předmět: |
Alkane
chemistry.chemical_classification Chemistry Enthalpy Biophysics Solvation Thermodynamics 02 engineering and technology 010402 general chemistry 01 natural sciences Biochemistry 0104 chemical sciences law.invention Dilution Solvent 020401 chemical engineering law Azeotrope Thermochemistry 0204 chemical engineering Physical and Theoretical Chemistry Molecular Biology Distillation |
| Zdroj: | Journal of Solution Chemistry. 49:645-658 |
| ISSN: | 1572-8927 0095-9782 |
| DOI: | 10.1007/s10953-020-00982-4 |
| Popis: | This work is devoted to the study of azeotropes by the method of solvation thermodynamics. In the present work the thermochemistry of alkane solutions in binary mixtures was studied. The infinite dilution solution enthalpies of n-hexane, n-octane, and n-dodecane in binary mixtures were measured at 298.15 K. Alkanes were used as solutes since they are not capable of specific interactions with solvents. It should be noted that the differences in the solution of alkanes in a series of solvents are caused by differences in the interactions between the solvent molecules. Binary mixtures (benzene–cyclohexane) and (n-hexane–acetone) at different molar ratios, including the compositions corresponding to azeotropes, were used. The composition of both azeotropes obtained by distillation was determined by means of densimetry, and was found to be in good agreement with published data. The compositions of chosen azeotropes insignificantly change with temperature. The excess solution enthalpies of n-alkanes in binary solvents were calculated. It was found that the extremum value of the excess solution enthalpy corresponds to their azeotrope composition. |
| Databáze: | OpenAIRE |
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