Thermodynamic properties of binary mixtures of 2-chlorotoluene plus alkanol at T=298.15 K to 318.15 K

초록

Density (& rho;), viscosity (& eta;), and ultrasonic speed (u) of 2-chlorotoluene with methanol and ethanol binary mixtures were measured at 298.15 to 318.15 K in the composition range 0 & LE;x1 & LE;1. Based on the experimental data, the excess molar volume (VEm), deviation in viscosity (& UDelta;& eta;), and deviation in ultrasonic speed (& UDelta;u) values were calculated. The VEm values exhibited negative for binary mixtures but at higher concentrations of 2-chlorotoluene, these were changes sign and positive at all temperatures. The excess isentropic compressibility (& kappa;Es ) values increase with the number of C-atoms of the alkanol. The order of & kappa;Es for 2-chlorotoluene + alkanol is similar to that observed in the case of VEm. Additionally, & UDelta;& eta; and & UDelta;u values were positive throughout the complete range of composition. At 298.15 K, the & eta; and u values were analyzed using various correlations. Among the correlation Nomoto's correlation for ultrasonic exhibits a high predictive power compared to others. A binary mixture has been discussed in terms of its excess functions which provide insights into molecular interactions. The & UDelta;& eta; and & kappa;Es were also interpreted in terms of the ab initio approach that yielded interaction parameters that not give the extent of unlike interactions and depolymerization of self-associated alkanol but also predict the & UDelta;& eta; and & kappa;sE for these systems. Singh's model for viscosity further authenticates the findings of the ab initio approach.

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