Two and three phase equilibrium calculations for systems containing water

Abstract A recently proposed two‐constant equation of state is used to predict the phase behaviour of systems exhibiting a water‐rich liquid phase, a hydrocarbon‐rich liquid phase and a vapor phase. The algorithm proposed is efficient and thermodynamically rigorous and it converges significantly faster than earlier models. Representative calculations are shown for the methane‐n butane water system, the n butane‐1 butane‐water system, and a synthetic six‐component hydrocarbon mixture containing waer.