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Effect of the Thermodynamic Model and Parameters in Process Modelling

In this paper, we analyse the effect of the choice of the thermodynamic model, in the context of fluid modelling for the purposes of process simulation in oil and gas applications. The importance of making the right choice of the thermodynamic model, for the specific application, was highlighted in the past (Carlson, 1996), as consequences may be difficult to predict and quite significant.

Nonetheless, it is still normal engineering practice, both in design and operations, to use the model set as default, in the process simulation software that is being used. The default model is normally a variant of the Peng-Robinson, with a set of pure components data and BIPs, which is often lacking the necessary accuracy to guarantee reliable predictions for the phase equilibrium or the physical properties of the mixture.

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