Application of the CPA equation of state to glycol/hydrocarbons liquid-liquid equilibria

Samer Derawi, Michael Locht Michelsen, Georgios Kontogeorgis, Erling Halfdan Stenby

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The Cubic Plus Association (CPA) equation of state is a thermodynamic model, which combines the well-known cubic SRK (Soave-Redlich-Kwong) equation of state and the association term proposed by Wertheim, typically employed in models like SAFT (statistical associating fluid theory). CPA has been shown in the past to be a successful model for phase equilibria calculations for systems containing water, hydrocarbons and alcohols. In this work, CPA is applied for the first time to liquid-liquid equilibria (LLE) for systems containing glycols and hydrocarbons. It is shown that excellent correlation is achieved with solely a single interaction parameter per binary system. The correlation procedure as well as the nature of the experimental data play a crucial role in the parameter estimation and they are thus extensively discussed. (C) 2003 Elsevier Science B.V. All rights reserved.
Original languageEnglish
JournalFluid Phase Equilibria
Issue number2
Pages (from-to)163-184
Publication statusPublished - 2003


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