Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

Vapor-liquid equilibria (VLE) for the difluoromethane (R32) + n-butane (R600) system which shows liquid phase immiscibility below 246 K, were measured at (263.15, 278.15 and 293.15) K by means of a static analytical method. The (T-P-x-y) VLE data were correlated using various equations of state and various mixing rules, in order to compare the ability of these models to correlate data for this strongly non-ideal system. The correlation of the VLE data and published VLLE data shows the system is azeotropic at temperatures higher than the UCEP (246 K), hetero-homoazeotropic between (246 and 230) K and heteroazeotropic below 230 K. A comparison with the available in literature VLE data was performed.