The concentrations of the vapor-liquid equilibria have been measured in a small capacity recirculating still for the binaries composed of four butyl esters (from methanoate to butanoate) and propan-2-ol at a constant pressure of 101.32 kPa. VLE data were thermodynamically verified with the point-to-point test and the predictions made using several group-contribution models were acceptable but with some exceptions, An azeotrope was found for (x(1)butyl methanoate+x(2)propan-2-ol) at x(1) = y(1) = 0.038 and T = 351.9 K.