Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

ABSTRACT

The vapor liquid equilibrium (VLE) data of ternary systems (methane + n-decane + n-tetradecane) at ambient temperature and various pressures, 1 to 8 MPa, have been measured using a designed pressure volume temperature (PVT) apparatus. The phase compositions and saturated liquid phase properties, density and viscosity, have been measured for each pressure. The densities of three different (n-decane + n-tetradecane) binary mixtures have also been measured at ambient temperature over a wide range of pressures (1 to 10 MPa). The generated experimental data have been correlated with two cubic equations of state (EoS), Peng-Robinson (PR) and Soave-Redlich-Kwong (SRK). The binary interaction parameters and the volume shift values from the experimental information on the binary pairs, (methane + n-decane) and (methane + n-tetradecane), have been used to predict the VLE data of ternary system (methane + n-decane + n-tetradecane). Both equations of state have been found to be capable of describing the phase equilibria of binary pairs as well as ternary systems over the range of studied conditions.