The study of physico-chemical properties of binary systems consisting of N-Methylcyclohexylamine with 2-alkanols at T = (298.15–328.15) K
Introduction
The thermodynamic and transport macroscopic properties of liquid mixtures are the reflection of the intermolecular forces and microscopic structure of the liquids. It is very important to know some of the physical properties like density, refractive index, viscosity or dielectric constant, to understand the interaction between different molecules in the liquid solutions. The variations of these properties with concentration give important information about intermolecular interactions and solvent structure [1], [2], [3], [4]. Moreover, knowledge of these excess molar properties can be helpful in predicting the solution behavior of solvents. Excess and deviation properties of mixtures are complex properties because they depend not only on solute-solute, solvent-solvent and solute-solvent interactions, but also of the structural effects arising from interstitial accommodation. Knowledge of several properties such as transport and electromagnetic quantities is required for engineering design and for subsequent operations. Alcohols are a class of compounds with polar character and have relatively high dielectric constants and are self-associated with hydrogen bonding. N-Methylcyclohexylamine, the common component exhibits self-association due hydrogen bonding in pure state. Further, the amine group tends to participate in hydrogen bonding interaction with 2-alkanols. Hydrogen bonding is one of the most important types of intermolecular interactions play an important role in various physicochemical, biological and industrial processes.
In the present paper, as a continuation of our research group works, we report the densities of binary liquid systems of (2-propanol, 2-butanol, 2-pentanol, 2-hexanol, 2-heptanol and 2-octanol with N-Methylcyclohexylamine) at T = (298.15–328.15) K over the entire range of concentration using a vibrating-tube densimeter. Experimental data for these systems allow us to test various equations appearing in the literature to predict their thermodynamic properties. These properties of pure liquids and their mixtures and mathematical models are very useful to design chemical processes.
Section snippets
Materials
2-Propanol was provided by Merck with a mass fraction of 0.998 and 2-butanol, 2-pentanol, 2-heptanol and 2-octanol were purchased from Merck, which purities in mass fraction were 0.99. Also 2-hexanol and N-Methylcyclohexylamine were supplied by Sigma- Aldrich with a mass fraction of 0.99. Information about the liquids employed in this work summarized in Table 1. The density and refractive index of the pure compounds were compared to literature data [5], [6], [7], [8], [9], [10], [11], [12], [13]
Densities and excess molar volumes
Excess molar volume for all mixtures was calculated from measured density at T = (298.15–328.15) K with intervals of 10 K in ambient pressure (81.5 kPa) by using the following equation:where ρ, is the density of system, are the density and molar mass of the pure component and is the mole fraction. Excess molar volumes for binary systems of 2-propanol, 2-butanol, 2-pentanol, 2-hexanol, 2-heptanol and 2-octanol with N-Methylcyclohexylamine at T = (298.15–328.15) K were
Discussion
The density of N-Methylcyclohexylamine has been reported by C. Narasimha Rao et al. [32] and Losetty Venkatramana et al. [33] at T = 303.15 K using pycnometer. Also density of N-Methylcyclohexylamine has been reported by von H. Rupe [34] at T = 293.15 K. Fig. 1 shows the comparison of the present results for density of N-Methylcyclohexylamine with the data reported by various authors [32], [33], [34] graphically. The comparison of our density at T = 303.15 K with data reported by C. Narasimha Rao et al.
Conclusion
The density of six binary mixtures of 2-alkanols (2-propanol, 2-butanol, 2-pentanol, 2-hexanol, 2-heptanol and 2-octanol) with N-Methylcyclohexylamine were measured over the temperature range of (298.15–328.15) K and over the entire composition range. Data of the excess molar volumes for these binary mixtures were calculated from the values of the experimental density. As Fig. 2 shows, the excess molar volumes obtained are negative over the entire composition range and absolute values of
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