ELSEVIER Thermochimica Acta 261 (1995) 83-93 therm0chimica acta Isobaric VLE data for the binary systems 1,4-dichlorobutane with isomeric butanols at 40.0 and 101.3 kPa C. Lafuente, J. Pardo, M.C. L6pez, F.M. Royo, J.S. Urieta* Departamento de Quimica Org6nica-Quimica F[sica, Facultad de Ciencias, Universidad de Zaragoza, Ciudad Universitaria, Zarayoza 50009, Spain Received 27 February 1995; accepted 18 March 1995 Abstract Isobaric vapour-liquid equilibrium data at 40.0 and 101.3 kPa for the binary systems 1,4- dichlorobutane with 1-butanol, 2-butanol, 2-methyl-l-propanol and 2-methyl-2-propanol are reported. The systems 1,4-dichlorobutane + 1-butanol or 2-methyl-l-propanol at 40.0 kPa show azeotropes. The VLE data are thermodynamically consistent, and the activity coefficients were satisfactorily correlated with the Margules, Van Laar, Wilson, NRTL and UNIQUAC equations. Keywords: Binary systems; Butanols; VLE 1. Introduction Vapour-liquid equilibria of binary mixtures can be used to derive information about molecular interactions between the components of the mixtures. With this aim, we present here the vapour-liquid equilibrium data for the binary systems 1,4-dichlo- robutane with isomeric butanols at pressures of 40.0 and 101.3 kPa. This work is part of our program for determining VLE data for systems in which one of the components is an haloalkane and the other is an isomer of butanol [1,2]. No isobaric VLE data were found in the literature for these mixtures. * Corresponding author. 0040-6031/95/$09.50 © 1995 - Elsevier Science B.V. All rights reserved SSDI 0040-6031(95)02370-4