Pinki Kashyap, M. Rani, D. Tiwari

2020

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Journal

Korean Journal of Chemical Engineering

Abstract

− Densities ( ρ ) for binary mixtures of ethanol (1) + diisopropyl ether (DIPE) or cyclohexane or alkane (C 6 -C 9 ) (2) were measured at 298.15 K, 308.15 K and 318.15 K. The excess molar volume ( ) of binary mixtures was calculated using ρ data and correlated with Redlich-Kister polynomial equation. The values for binary mixtures of ethanol (1) + cyclohexane or n-alkane (C 6 -C 9 ) (2) were positive, whereas for ethanol (1) + DIPE (2) these were negative. The magnitude of values follows the order: cyclohexane > n -nonane > n -octane > n -heptane > n -hexane > DIPE. The values have been interpreted qualitatively and also quantitatively in terms of Flory-Treszczanowicz-Benson (FTB) model and Prigogine-Flory-Patterson (PFP) theory. The values predicted using FTB model agree well with experimental values at all mole fractions. But the PFP theory describes well data in ethanol-rich region ( x 1 > 0.5) for all binary mixtures and is able to predict the sign of vs x 1 curve for ethanol-lean region ( x 1 < 0.5) except for ethanol (1) + nonane (2) mixtures.

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