Thermodynamics of mixtures with strongly negative deviations from Raoult's law: Part 9. Vapor–liquid equilibria for the system 1-propanol + di-n-propylamine at six temperatures between 293.15 and 318.15 K |
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| Institution: | 1. Departamento de Química Orgánica-Química Física (Área de Química Física), Facultad de Ciencias, Universidad de Zaragoza, 50009 Zaragoza, Spain;2. G.E.T.E.F. Departamento de Termodinámica y Física Aplicada, Facultad de Ciencias Universidad de Valladolid, E-47071 Valladolid, Spain;1. Laboratory for Research on Advanced Processes for Water Treatment, Unidad Académica Juriquilla, Instituto de Ingeniería, Universidad Nacional Autónoma de México, Blvd. Juriquilla 3001, 76230 Querétaro, México;2. Service d’Automatique, Faculté Polytechnique de Mons – UMons, Bd. Dolez 31, B7000 Mons, Belgium;1. University of Silesia in Katowice, Institute of Technology and Mechatronics, 12, Żytnia St., Sosnowiec 41-200, Poland;2. University of Applied Sciences Münster, Department of Chemical Engineering, Stegerwaldstrasse 39, D-48565, Steinfurt, Germany |
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| Abstract: | Vapor pressures of the 1-propanol + di-n-propylamine (DPA) system at six different temperatures between 293.15 and 318.15 K were measured by a static method. The reduction of the experimental data to obtain molar excess Gibbs energies, GE was carried out according to Barker's method, assuming that GE is represented by a Redlich–Kister equation. In the temperature range considered, the mixture shows azeotropic behaviour and negative deviation from the Raoult's law. DISQUAC describes better than the ERAS or UNIFAC (Dortmund version) models the experimental data. The analysis of the mixture structure in terms of the so-called concentration–concentration structure factor, Scc(0) reveals that interactions between unlike molecules occur in such a way that several molecules of amine interact with one molecule of alcohol. |
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