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 313.15 K 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 V E . All the mixtures exhibit large and negative V E 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 V E is insignificant. Experimental V E 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.