Geophysical processes and biosphere: article

Аnnotation: The introduction of environmentally friendly technologies in the oil and gas industry requires the development of numerical simulation methods for phase equilibria of multicomponent mixtures. In this paper, the PC-SAFT equation of state, which is gaining popularity in this field, was applied to calculate the parameters of vapor-liquid equilibrium of six binary mixtures of n-alkanes: methane and ethane, methane and propane, methane and n-butane, ethane and propane, ethane and n-butane, propane and n-butane. Calculations were performed using direct minimization of the Helmholtz energy of an isochoric-isothermal binary system. The performed analysis showed that the PC-SAFT equation of state in combination with direct energy minimization successfully predicts the parameters of phase equilibria of binary mixtures of light hydrocarbons, which indicates the prospects for further development of this approach for numerical simulation of the phase behavior of hydrocarbon systems.