Study of Molecular Interactions in Ternary Liquid Mixtures

Abstract

Abstract. The ultrasonic velocities and densities of ternary mixtures of quinolone with toluene and methanol as common compound, including those of pure liquids, over the entire composition range were measured at temperatures (303.15, 308.15, 313.15 and 318.15) K and atmospheric pressure. From the experimental data, excess molar volume V m E , excess ultrasonic velocity u E and excess acoustic impedance Z E were calculated. The variation these parameters with composition and temperature of the mixtures are discussed in terms of molecular interactions in these mixtures. All the calculated excess parameter values were found to be positive and negative at each temperature studied. INTRODUCTIONThe importance of thermodynamic properties of liquid mixtures in design calculations involving chemical separations, heat transfer, mass transfer and fluid flow have recognized the chemical industries [1]. These properties provide information about the state of components as well as nature and extent of interactions operating among the constituent of mixtures.To increase the efficiency, quinoline is used in solar cells and also used in dyes. Toluene is a common solvent, able to dissolve paints, paint thinners, silicon sealants, many chemical reactants, rubber, printing ink, adhesives, lacquers, leather tanners and disinfectants. It is used as a solvent for carbon nanomaterials, including nanotubes and fullerenes. Toluene is also used as an octane booster in gasoline fuels used in internal combustion engines. It is recently used as component for jet fuel surrogate blends. Alcohols are self-associated organic liquids and are used as the basic organic compound for the synthesis of other organic compounds. The study of ternary mixtures of quinoline with toluene in methanol would of considerable interest because these mixtures exhibit varying molecular interactions and are important from an industrial point of view.In continuation of our work on thermodynamic properties of binary and ternary mixtures containing quinolone as one of the component [2,3], we report here ultrasonic velocities and densities of the ternary mixtures of quinoline with toluene in methanol at varying temperatures of (303.15, 308.15, 313.15 and 318.15) K over the entire range of composition.Knowledge of various thermodynamic properties of mixtures involving quinoline with selfassociated alcohols and phenols helps in designing an efficient industrial process and also helps in understanding the inter and intra molecular interactions. Several researchers carried out investigations of acoustic and thermodynamical properties of binary mixtures containing phenols [4][5][6][7]. As of our knowledge no work is done in ternary mixtures containing quinoline with toluene in methanol. MATERIALS AND METHODSThe analytical grade chemicals obtained from SRL Chemicals, Mumbai were used. They were purified by standard procedure [8]. To prepare the mixtures in the required proportions, Job's method of continuous variation was used. The mixtures were preserved in well-stoppard con...