Isothermal vapor-liquid equilibrium (VLE) data for diethylamine(1) + acetone(2) and diethylamine(1) + acetonitrile(2) binary systems were obtained at 323.15 K by dynamic method. Excess molar volumes at 298.15 K for these systems were measured by a dilution dilatometer. VLE data have been checked for thermodynamic consistency and correlated by Wilson, NRTL and UNIQUAC equations. UNIFAC group interaction parameters for CH2NH-CH3CO and CH2NH-CH3CN pairs are also obtained from the experimental VLE data.