In this work, the isobaric vapor-liquid equilibrium (VLE) for the pseudo-binary systems isoamyl alcohol + isoamyl propionate and propionic acid + isoamyl propionate at three different pressures is reported. Measurements were done in a dynamic equilibrium cell (Fischer Labodest VLE 602) at 50.00, 101.33 and 150.00 kPa. The experimental data were tested for thermodynamic consistency with point, total area and infinite dilution tests, using the Hayden-O'Connell equation-of-state for the calculation of vapor fugacity coefficients and the Dortmund modified UNIFAC group contribution method for the prediction of excess enthalpies. VLE data were correlated using the NRTL activity model and good agreement with experimental data was observed. (C) 2013 Elsevier B.V. All rights reserved.