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

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.

Automated summary

Density, viscosity, and ultrasonic speed of 2-chlorotoluene with methanol and ethanol binary mixtures were measured at various temperatures. The excess molar volume, deviation in viscosity, and deviation in ultrasonic speed were calculated based on the experimental data. The results showed negative excess molar volume values for the binary mixtures, but positive at higher concentrations of 2-chlorotoluene. The viscosity and ultrasonic speed deviations were positive throughout the composition range. Various correlations were analyzed to determine viscosity and ultrasonic speed values, and Nomoto's correlation was found to be highly predictive. The findings provide insights into molecular interactions and were further validated using the ab initio approach and Singh's viscosity model.