2-Propoxyethanol (C3E1) is one of nonionic surfactants which are a particularly interesting class of substances due to both inter-molecular and intra-molecular association. Binary (vapor + liquid) equilibrium data were measured for (2-propoxyethanol (C3E1) + n-hexane) and (2-propoxyethanol (C3E1) + n-heptane) systems at temperatures ranging from (303.15 to 323.15) K. A static apparatus was used in this study. The experimental data were correlated well with a lattice fluid equation of state that combines the multi-fluid non-random lattice fluid model with Veytsman statistics for (intra + inter)-molecular association. (C) 2008 Elsevier Ltd. All rights reserved.