Phase Equilibrium in an Octadecane–Propane/n-Butane System

Results are presented from an experimental study of the phase equilibrium (PTxy dependence) of an n-octadecane–propane/n-butane system for three isotherms (403.15, 423.15, 443.15 K) in the 0.89–7.24 MPa range of pressures using a high-pressure optical cell. The PTxy data are used to determine critical parameters of a mixture with identical concentrations of the two phases (x = y at fixed P and T).