Speeds of sound and isentropic compressibilities of binary mixtures containing trialkylamines with alkanes and mono-alkylamines at 303.15 and 313.15 K |
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| Affiliation: | 1. Center for Advanced Photonics Research, Temple University, Philadelphia, PA 19122, United States;2. Department of Chemistry, Temple University, Philadelphia, PA 19122, United States;3. Department of Physics, Temple University, Philadelphia, PA 19122, United States;4. Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark;1. Lobachevsky State University of Nizhni Novgorod, Gagarin Prospekt 23/5, 603950 Nizhny Novgorod, Russian Federation;2. Moscow State University, Leninskie Gory, 119991 Moscow, Russian Federation;1. Testing and Analysis Center, Hebei Normal University, Shijiazhuang 050024, PR China;2. College of Chemistry & Material Science, Hebei Normal University, Shijiazhuang 050024, PR China;3. College of Chemical Engineering & Material, Handan University, Handan 056005, Hebei Province, PR China |
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| Abstract: | Isentropic compressibilities κS, and excess isentropic compressibilities κSE have been determined from measurements of speeds of sound u and densities ρ of 14 binary mixtures of triethylamine (TEA) and tri-n-butylamine (TBA) with n-hexane, n-octane, iso-octane, n-propylamine, n-butylamine, n-hexylamine and n-octylamine. The relative magnitude and sign of κSE have been interpreted in terms of molecular interactions and interstitial accommodation. The values of κSE for TEA + alkane are positive while for TBA + alkane are negative. The values of κSE for TEA + primary amine become progressively less positive and eventually to negative with the increase in chain length of alkylamine. In case of TBA + primary amine, the values of κSE increase from n-propylamine to n-butylamine, and then decrease with chain length of primary amine. The experimental speeds of sound u have been analyzed in terms of collision factor theory, free length theory and Prigogine–Flory–Patterson statistical theory of solutions. |
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