ISOBARIC VAPOR-LIQUID-EQUILIBRIA FOR PROPYL METHANOATE PLUS (N-ALKANES, C-7, C-8, C-9) OR N-ALKANOLS (C-2, C-3, C-4)

The compositions of the vapor-liquid equilibria have been obtained in a small capacity recirculating still for the binary mixtures composed of propyl methanoate with n-alkanes (heptane, octane, nonane) and n-al kanols (ethanol, propanol, butanol) at a constant pressure of 101.32 /- 0.02 kPa. Experimental data were thermodynamically verified and the n correlated with suitable equations. The mixtures (x1 propyl methanoa te + x2 n-heptane, or + x2 ethanol, or + x2 propan-1-ol) have an azeot rope at x1 = 0.786, 0.482 and 0.852, respectively. The predictions mad e by the ASOG and UNIFAC models can be considered acceptable.