Ioannis Tsivintzelis

Chemicals in Gas Processing (CHIGP): An industrial project for the thermodynamics of complex petroleum fluids

Publisher Summary Cubic-Plus-Association (CPA) is a versatile model that can be used to predict thermodynamic properties of pure fluids and mixtures with non-ideal behavior, such as mixtures with hydrogen bonding fluids in gas, liquid or supercritical state. It is a combination of the SRK (Soave-Redlich-Kwong) cubic equation of state with the Wertheims first order thermodynamic perturbation theory. During the last years, the model has been successfully applied for the modeling of various systems. CPA is shown to be highly successful for systems that contain associating compounds (water, alcohols, glycols, acids, amines) and inert non-associating compounds. The Cubic-Plus-Association (CPA) equation of state has been shown to be a versatile and highly successful thermodynamic model for mixtures of interest to the petroleum and gas industries. CPA combines the classical simple SRK equation with an advanced association term. It provides a balance between accuracy and simplicity, as the model reduces to (the often used in oil & gas industry) SRK in the absence of hydrogen bonding compounds (water, alcohols, acids, etc). Besides simplicity and accuracy, the numerical implementations of the association term ensure that the computation time is not much higher than that of SRK and other simple models.