Excess Molar Volume, Viscosity and Heat Capacity for the Mixture of 1,2-Propanediol- Water at Different Temperatures

摘要

Experimental densities, viscosities and heat capacities at different temperatures were presented over the entire mole fraction range for the binary mixture of 1,2-propanediol and water. Density values were used in the determination of excess molar volumes, V~E. At the same time, the excess viscosity was investigated. The values of V~E and η~E were fitted to the Redlich-Kister equation. Good agreement v as observed. The excess volumes are negative over the entire range of composition. They show an U-shaped-conentration dependence and decrease in absolute values with increase of temperature. Values of η~E are negative over the entire range of the composition, and has a trend very similar to that of V~E . The analysis shows that at any temperature the specific heat of mixture is a linear function of the composition as x_1 > 20%. All the extended lines intersect at one point. An empirical equation is obtained to calculate the specific heat to mixture at any composition and temperature in the experimental range.