Thermodynamic modelling of oil-seawater system
The purpose of this project is to further develop SAFT models, specifically the simplified PC-SAFT (sPC-SAFT) equation of state (EOS), capable of predicting various properties (especially speed of sound, and phase behavior/solubilities, densities, etc.) in oil-sea water mixtures over a wide range of conditions with respect to temperature, pressure, salinity of water and for a wide range of oil mixtures of different types and origins.
In this presentation, experimental speed of sound data in different systems will be presented to give an overall viewpoint about its relationship with temperature, pressure and composition, and then some speed of sound modeling results with different EOS will be given. Following a brief introduction of the sPC-SAFT EOS, an approach will be discussed to improve its predictive performance on speed of sound description. Modeling results of speed of sound in pure normal hydrocarbons, pure normal alcohols and their binary systems will be presented. In order to apply the EOS models for oils, characterization is needed. A general characterization method is proposed for the sPC-SAFT EOS, and its performance on routine PVT data will be discussed. Modeling systems containing water with the sPC-SAFT EOS is a vital part of this project. However, it is a far from trivial task. The challenges will be discussed and the solutions are still unknown. Your suggestions are most welcome.