Excess molar volumes of diisopropylamine + (C1–C5) alkan-1-ols: Application of the ERAS model and cubic EOS

Densities of the binary mixtures consist of methanol, ethanol, 1-propanol, 1-butanol and 1-pentanol with diisopropylamine were measured at temperatures (293.15, 298.15, 303.15 and 313.15) K and atmospheric pressure. Data were used to calculate the excess molar volumes. All the excess molar volumes are large and negative over the whole range of mole fraction, indicating strong interactions between unlike molecules. The ERAS-model has been applied for describing the binary excess molar volumes. The ERAS parameters confirm that the strong interactions between unlike molecules are encountered in mixtures. Also the Peng–Robinson–Stryjek–Vera (PRSV) equation of state has been used to predict the binary excess molar volumes.

► This paper shows excess molar volumes of diisopropylamine + alkan-1-ols at various temperatures. ► Few data for these systems are available. ► We analyzed the influence of temperature and chain length of alkanols upon the excess molar volumes. ► Two models (ERAS model and cubic EOS) used to confirm experimental data and application of these models. ► Cubic EOS show lower deviations and reduced complexity in parameter comparing by the ERAS model.