Binary blend, Molecular interaction, Estimated sound velocity, statistical model.
Purpose: To understand the nature of liquids the need of physico-chemical behavior of liquid mixtures or in pure form Sound velocity, viscosity and density values have been calibrated in binary and ternary system of some of the Aniline+1-alkanols with benzene, toluene, and hexane at 303K. Several theoretical models have been applied to evaluate the sound velocity values for the binary and ternary systems compared with the experimental values.
Method: The ultrasonic velocity, density and viscosity measured with ultrasonic interferometer, specific gravity bottle with Oswald’s viscometer respectively. The measured ultrasonic velocity compared with theoretical models to understand the existence of molecular interactions from models like Nomoto’ Relation, Free Length Theory, ideals mixture relation etc.
Results: NR predictions provide better closeness with test values and FLT predictions are not completely acceptable. FLT prediction is found to fail even for pure liquids. IMR predictions are more acceptable than NR, only for aniline + 1-pentanol binary and NR seem to be the best of all other systems. In binary, IMR predicted values are always lower than test values, but NR predictions are, in most cases, higher than test values. In ternary systems, especially at high mole fractions of aniline, the predicted sound velocity values (NR & IMR) are always lower than the experimentally observed values. Among the many theories considered, NR gives the best prediction of sound speed. The sequence of qualifications for predicting sound speed decreases as NR and IMR and FLT are completely invalid for all considered systems.
Conclusion: Strong molecular interaction with the structure formation increases with mole fractions. Azeotropic destruction has been found to be the most common of the compounds considered.