Densities rho of the ternary system 1-butanol + hexylamine + n-heptane and binaries: 1-butanol + hexylamine and hexylamine + n-heptane within the temperature range (288.15-323.15K) and atmospheric pressure are reported. Excess molar volumes V-E were calculated from the density data and fitted by the Redlich-Kister and Nagata and Tamura equations. The results are analyzed in terms of the molecular interactions between the components of mixtures. Several empirical relationships (Radojkovic, Kohler, Jacob-Fitzner, Colinet,Tsao-Smith,Toop, Scatchard and Rastogi) were applied for prediction of V-E data of the ternary system from the corresponding binary data. For the correlation of binary V-E, the Peng-Robinson-Stryjek-Vera cubic equation of state (PRSV CEOS) coupled with the van der Waals (vcIW1) and CEOS/G(E) mixing rule introduced by Twu et al. (TCBT) were chosen. Prediction of V-E of ternary system was performed by the same vdW1 and TCBT models. For the correlation of the V-E of ternary data only TCBT mixing rules were used. (C) 2010 Elsevier B.V. All rights reserved.