No abstract

Vapor liquid equilibrium data reported for the temperature range 30°to 60°C. show that the acetone-acetonitrile system conforms closely to Raoult's law. Heat-of-mixing and volume-change-of-mixing data confirm that this system exhibits only very small departures from ideal-solution behavior.Measurements have been made of the saturation pressures exerted by solutions of acetone and acetonitrile in vapor-liquid equilibrium at 30 °, 40 °, 50 °, and 600 C. Data were taken with a static cell for eight different liquid concentrations, including the pure components. At each temperature the results are well correlated by a linear relation between pressure and liquid mole fraction, demonstrating that this system closely obeys Raoult's law.The equilibrium cell was a 140-cm.3 glass vessel equipped with a magnetically driven stirrer. Thoroughly degassed pure materials were distilled into the evacuated cell until it was very nearly full of liquid. Since the cell was light and portable, successive weighings of the cell on an analytical balance allowed determination of the composition of its contents. The small vapor space contained less than one ten thousandth of the mass of solution in the cell. Thus the measured composition was taken as that of the liquid phase. Pressure measurements were made with a miniature pres-