A Review of Electrolyte Equations of State with Emphasis on Those Based on Cubic and Cubic-Plus-Association (CPA) Models

Electrolyte thermodynamics is a complex and broad subject of immense importance in very diverse applications. The models proposed for electrolyte solutions have some similarities to those non-electrolytes but also significant differences. Not just due additional contributions because the way are developed electrolytes vs. non-electrolytes. Moreover, there still fundamental issues unresolved thermodynamics. It today activity coefficient models, often extensions local-composition that used engineering practice e.g., Pitzer, NRTL extended UNIQUAC. In this review, however, we investigate area equations state (EoS) electrolytes, rich field which essentially started with Fürst Renon model 1993. Since then numerous EoS (e-EoS) been proposed; literature both confusing. We decided work review mostly versions cubic CPA (Cubic-Plus-Association) EoS, although observations made may be applicable e-EoS SAFT type as well, them briefly discussed. Reviewing not an easy task especially diversity modeling parameter estimation approaches followed well validated. Almost none can compared “on equal terms” another e-EoS. Thus, critical comparative analysis here, including recent developments e-CPA approach. When possible, different modeling—parameter estimation—validation compared. hoped provide insight on current state-of-the-art point out areas where further research needed.