Phase behaviour and density of (methane plus n-butane)

The densities of six mixtures of (methane + n-butane) were determined over the temperature range 316 to 479 K and the pressure range 8.8 to 48 MPa for mole fractions of methane between 0.3458 and 0.5333. The bubble points of the mixtures were also determined from an analysis of experimental isochore s in the one- and two-phase regions, The new measurements have been used in conjunction with selected data from the literature to assess the performan ce of both the volume-translated Peng-Robinson equation of state and the on e-fluid corresponding states model over a wide range of states. The relativ e strengths and weaknesses of the two models are highlighted. (C) 1999 Else vier Science B.V. All rights reserved.