High-pressure phase equilibria in methane + pentadecane system: Experimental measurement and modeling with PengRobinson equation of state

High-pressure vapor-liquid phase equilibria of the methane + pentadecane binary organic mixture were experimentally studied through nine (9) isopleth measurements at T = (299.45 – 374.45) K and pressures up to 60.00 MPa by a synthetic visual method using a variable-volume cell. Experimental data were compared with modeling results obtained from the Peng-Robinson equation of state. A single temperature-independent binary interaction parameter was also fitted to describe the experimental data better. The fluid phase equilibrium data obtained in this work helps us understand the behavior of the gas phase associated with crude oil and how excess gas influences the phase behavior of reservoir fluids. In addition, the data is crucial for modeling purposes and can be used to calibrate models, allowing them to describe more complex systems containing the components studied here more accurately.