V‐L‐S multiphase equilibrium in bitumen‐diluent systems

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Abstract
A multiphase flash algorithm is developed for the prediction of V‐L‐L‐S equilibrium. The algorithm uses the Patel‐Teja equation of state for the fluid phases and a separate model, based on vapour pressure, for the solid phase. A novel technique is presented for avoiding the phase disappearance problem commonly encountered in multiphase equilibrium calculations involving multiple fugacity models. The predictions are shown to be in good agreement with the data for several CO2 and hydrocarbons V‐L‐S systems.This paper also presents new experimental data for the solubility of Peace River bitumen in n‐pentane, n‐heptane and n‐octane at atmospheric conditions, and these are compared with the model predictions.