Volumetric properties of piperidine + 1-alkanol binary liquid mixtures experimental results and application of Prigogine–Flory–Patterson theory

Abstract

Densities of binary liquid mixtures of piperidine with methanol, ethanol, 1-propanol, 1-butanol, 1-pentanol, 1-hexanol and1-octanol have been measured at 293.15, 298.15, 308.15 and 313.15K and at atmospheric pressure, over the entire range of composition, with a vibrating u-tube densimeter. Density data were used to calculate the excess molar volumes VE. All the mixtures exhibit large and negative VE value over the whole mole fraction range indicating strong interactions between unlike molecules. These interactions increase with increasing alkanol chain length and are far stronger for piperidine+methanol system. Temperature effect on VE is insignificant. Experimental VE values were fitted with the Redlich–Kister equation. Partial molar volumes at infinite dilution were also determined. Finally, the applicability of the Prigogine–Flory–Patterson theory was tested and discussed.