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Activity Coefficients and Excess Gibbs Energies for Binary Mixtures of N-Methyl-2-pyrrolidone with Some Substituted Ethanols

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Department of Chemistry, Acharya Nagarjuna University, PG Centre, Nuzvid, Andhra Pradesh, India
Department of Physics, Andhra Loyola College, Vijayawada, Andhra Pradesh, India
§ Department of Chemistry, Andhra Loyola College, Vijayawada, Andhra Pradesh, India
*E-mail: [email protected]. Fax: 08656-235200.
Cite this: J. Chem. Eng. Data 2012, 57, 5, 1412–1416
Publication Date (Web):April 17, 2012
https://doi.org/10.1021/je3002078
Copyright © 2012 American Chemical Society

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    Abstract

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    Isobaric vapor–liquid equilibrium (VLE) data is determined for the binary mixtures of N-methyl-2-pyrrolidone + aminoethanol, N-methyl-2-pyrrolidone + chloroethanol, and N-methyl-2-pyrrolidone + phenylethanol at 95.3 kPa over the entire composition range using a Swietoslawski type ebulliometer. All three systems investigated show negative deviations from Raoult's law, and none of the binary systems formed azeotropic mixtures. The experimental VLE data of the three binary mixtures are correlated using the Wilson model. The computed vapor phase mole fractions, activity coefficients, and Gibbs energy along with optimum Wilson parameters are presented. The studies indicate that all three binary systems are nonideal liquid mixtures deviating from Raoult's law exhibiting negative values of excess Gibbs energies due to strong intermolecular hydrogen bonding between unlike molecules.

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