Isothermal vapor-liquid equilibrium (VLE) of three binary mixtures was measured with a static total pressure apparatus: dimethylsulfide +ethanol at 350.4K, +dimethylether at 336.7K, +methylacetate at 350.3 K. The Barker method was used to convert the total pressure and total composition measurements into vapor-liquid equilibrium data. Legendre polynomial and Wilson model were used as the liquid activity coefficient model to obtain the compositions of the vapor and liquid phases. All systems exhibited positive deviation from Raoult's law. The dimethylsulfide + ethanol system showed azeotropic behavior (x(1az) = 0.058, T-az = 350.4 K, P-az = 341.9 kPa). (C) 2013 Elsevier B.V. All rights reserved.