Vapor-liquid equilibria and critical point data for the system 1-propanol + n-hexane at 483.15, 493.15, 503.15 and 513.15 K are reported. The critical pressures determined from the critical opalescence of the mixture were compared with published data for the system 2-propanol + n-hexane. Phase behavior measurements were made in a modified circulating type apparatus with a view cell. These mixtures are highly nonideal because of the hydrogen bonding of 1-propanol. Modeling of the experimental data has been performed using the multi-fluid nonrandom lattice fluid with hydrogen-bonding (MF-NLF-HB) equation of state and the Peng-Robinson-Stryjek-Vera (PRSV) equation of state with Wong-Sandler mixing rule. The critical points and the critical locus were also calculated. (C) 2003 Elsevier B.V. All rights reserved.