Vapor pressures at several temperatures and excess functions at 298.15 K of butanone with di-n-propyl ether or diisopropyl ether

Vapor pressures of butanone + di-n-propyl ether (n-propyl ether) or + diiso propyl ether (isopropyl ether) were measured at seven temperatures between 288.15 K and 323.15 K by a static method. Excess molar enthalpies and volum es were also measured at T = 298.15 K. Reduction of the vapor pressures to obtain activity coefficients and excess molar Gibbs free energies was carri ed out by fitting the vapor pressure data to the Redlich-Kister correlation according to Barker's method. Azeotropic mixtures with a minimum boiling t emperature were observed over the whole temperature range. The apparent exc ess enthalpy and volume due to the specific interaction between unlike mole cules were calculated.