Thermodynamic properties of mixtures containing alkoxypropanol and n-alkanol

The densities ρ for binary liquid mixtures containing dipropylene glycol monopropyl ether and methanol, 1-propanol, 1-pentanol and 1-heptanol have been measured as a function of composition using an Antan-Paar DSA 5000 densimeter at T = (288.15, 298.15, and 308.15) K and atmospheric pressure over the whole concentration range. The density values were used to calculate excess molar volumes VmE which further allowed the following mixing quantities to be reported in all range of concentrations or at equimolar concentrations: α  , volume expansivity; (δVmE/δT)P; (δHE/δP)T at T = 298.15 K. The obtained results have been compared at 298.15 K with the calculated values using the Flory theory of liquid mixtures. The theory predicts the α, and αE values rather well, while the calculated values of (δVmE/δT)P and (δHE/δP)T show general variation with the alkyl chain length of the n-alkanols. The results are discussed in terms of order or disorder creation.