Vapour-liquid equilibrium data in the two binary 2-propanol + 4-methyl-2-pentanone, and diisopropyl ether + 4-methyl-2-pentanone systems, and in the ternary 2-propanol + diisopropyl ether + 4-methyl-2-pentanone system are reported. The data were measured isothermally at 330.00 and 340.00 K covering the pressure range 12-100 kPa. The binary vapour-liquid equilibrium data were correlated using the Wilson, NRTL and Redlich-Kister equations; resulting parameters were then used for calculation of phase behaviour in the ternary system and for subsequent comparison with experimental data. (c) 2005 Elsevier B.V. All rights reserved.