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Vapour pressures and excess functions of N, N, N′, N′-tetramethylalkanediamine + cyclohexane. A group contribution study of the N---N proximity effect |
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| Authors: | Abdallah Dahmani Ahmed Ait Kaci Jacques Jose |
| Institution: | a Laboratoire de thermodynamique des mélanges organiques, Institut de chimie, USTHB, BP.32 El-Alia, 16111 Bab-Ezzouar, Alger, Algerie b Laboratoire de chimie analytique I, Université Claude Bernard (Lyon I), 43, bd du 11 Novembre 1918, 69622, Villeurbanne, France |
| Abstract: | The vapour pressuresof liquid cyclohexane + N, N, N′, N′-tetramethylalkanediamine, (CH3)2 N(CH2)uN(CH3)2 (u = 1,2) + cyclohexane mixtures were measured by a static method between 303.15 and 343.15 K at 10 K intervals. The excess molar enthalpies at 303.15 K were also measured. The molar excess Gibbs energies, calculated from the vapour-liquid equilibrium data, and the molar excess enthalpies compare satisfactorily with group contribution (DISQUAC) predictions. The proximity effect of N atoms produces a regular decrease of the interactional parameters. |
| Keywords: | Data Excess properties Vapour-liquid equilibria Enthalpy Diamines Cyclohexane |
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