Volumetric, transport, and acoustic properties of binary mixtures of 2-methyl-1-propanol with hexadecane and squalane at T = (298.15, 303.15, and 308.15) K: Experimental results, correlation, and prediction by the ERAS model

doi:10.1016/j.jct.2009.02.002

The Journal of Chemical Thermodynamics

Volume 41, Issue 7, July 2009, Pages 849-858

https://doi.org/10.1016/j.jct.2009.02.002 Get rights and content

Abstract

Density ρ, speed of sound u, and viscosity η of the binary systems 2-methyl-1-propanol + hexadecane and 2-methyl-1-propanol + squalane (2,6,10,15,19,23-hexamethyltetracosane) have been measured over the entire range of composition at T = (298.15, 303.15, and 308.15) K and atmospheric pressure using a vibrating tube densimeter and sound analyzer Anton Paar model DSA-5000 and Ubbelohde suspended level viscometer. Excess molar volume $V_{m}^{E}$ , excess molar isentropic compressibility $K_{S, m}^{E}$ , and deviations of the speed of sound u^D from their ideal values u^id and excess thermal expansion coefficient α^E were evaluated from the experimental results obtained. These derived properties were fitted to variable-degree polynomials. Further, the Extended Real Associated Solution (ERAS) model has been applied to $V_{m}^{E}$ for the present binary mixtures along with (2-methyl-1-propanol + hexane, + octane and + decane) and the findings are compared with the experimental results.

Introduction

Studies on thermodynamic, acoustic, and transport properties are important in understanding the nature of molecular interactions and physico-chemical behaviour in liquid mixtures. Properties of mixtures are useful for designing many types of transport and process equipment in the chemical industry [1], [2], [3], [4]. Amongst the oxygen containing organic molecules, alkanols in terms of hydrogen-bonded self-associations have been extensively studied experimentally as well as theoretically. The thermodynamic behaviour of alkanols in non-polar solvents shows pronounced non-ideality. The self-association of alkanols presents a picture of complicated equilibria involving monomer, dimers, trimers, tetramers, etc. with both linear and cyclic structures [5]. Our laboratory is engaged in systematic studies of thermodynamic, acoustic, and transport properties of (alkanols + alkanes). Speeds of sound, viscosities, and excess molar volumes of binary mixtures of 1-butanol, 1-hexanol, 1-octanol, 2-propanol, 2-methyl-1-propanol, with hexane, octane, decane, and of 1-butanol with hexadecane and squalane have been reported [6], [7], [8], [9], [10], [11], [12]. As an extension, in this paper excess molar volume $V_{m}^{E}$ , excess molar isentropic compressibility $K_{S, m}^{E}$ and excess thermal expansion coefficient α^E of binary mixtures of 2-methyl-1-propanol with hexadecane (C₁₆H₃₄) and squalane (C₃₀H₆₂) at T = (298.15, 303.15, and 308.15) K and atmospheric pressure over the entire range of composition have been reported as work on the binary mixtures containing hexadecane and squalane with alkanols is rather limited.

Section snippets

Experimental

The chemicals used in this work were of analytical grade. 2-Methyl-1-propanol (mole fraction purity 0.995) was supplied by S.D. Fine Chemicals Ltd., whereas hexadecane (mole fraction purity 0.99) was Hi-media product and squalane (mole fraction purity 0.99) was purchased from Acros. Prior to the experimental measurements, all the liquids were stored in dark bottles over 0.4 nm molecular sieves to reduce water content, and were partially degassed with a vacuum pump under a nitrogen atmosphere.

Results and discussion

The experimental results of density ρ, speed of sound u, excess molar volume $V_{m}^{E}$ , deviations in the speed of sound u^D, molar isentropic compressibility K_S_,_m, and their corresponding excess molar quantities $K_{S, m}^{E}$ at T = (298.15, 303.15, and 308.15) K for both the binary mixtures are listed in TABLE 2, TABLE 3. The $V_{m}^{E}$ have been calculated using the following equation: $V_{m}^{E} = \sum_{i = 1} x_{i} M_{i} (ρ^{- 1} - ρ_{i}^{* - 1}),$ where ρ and $ρ_{i}^{*}$ are the density of the mixture and the density of the pure components; x_i and M_i represent

Conclusions

In this paper, an attempt is made to report new measurements of density, speed of sound and viscosity at T = (298.15, 303.15, and 308.15) K over the entire range of mixture composition for (2-methyl-1-propanol + hexadecane or, +squalane) systems. Various excess properties and deviations ( $V_{m}^{E}$ , u^D, $K_{S, m}^{E}$ ), calculated using experimental results, support the existence of weak dispersive forces in these type of mixtures and rupture of H-bonded alcohol aggregates when mixture is formed.

Volumetric

Acknowledgements

Financial support for the project (Grant No. F.30-58/2004-SR dated 2/11/04) by the Government of India through University Grants Commission (UGC), New Delhi is gratefully acknowledged.

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The Journal of Chemical Thermodynamics

Volumetric, transport, and acoustic properties of binary mixtures of 2-methyl-1-propanol with hexadecane and squalane at T = (298.15, 303.15, and 308.15) K: Experimental results, correlation, and prediction by the ERAS model

Abstract

Introduction

Section snippets

Experimental

Results and discussion

Conclusions

Acknowledgements

J. Chem. Thermodyn.

J. Chem. Thermodyn.

J. Mol. Liq.

J. Chem. Thermodyn.

Fluid Phase Equilib.

Thermochim. Acta

J. Chem. Thermodyn.

Fluid Phase Equilib.

J. Chem. Thermodyn.

Fluid Phase Equilib.

Fluid Phase Equilib.

Fluid Phase Equilib.

Fluid Phase Equilib.

Fluid Phase Equilib.

Fluid Phase Equilib.

J. Chem. Eng. Data

J. Chem. Eng. Data

J. Chem. Soc. Faraday Trans. I

J. Chem. Eng. Data

J. Chem. Eng. Data

Phys. Chem. Liq.

J. Chem. Thermodyn.

J. Chem. Eng. Data

J. Chem. Eng. Data

J. Chem. Eng. Data