Phase equilibria modeling of methanol-containing systems with the CPA and sPC-SAFT equations of state

Peter Chr. V. Tybjerg, Georgios Kontogeorgis, Michael Locht Michelsen, Erling Halfdan Stenby

Research output: Contribution to journalJournal articlepeer-review


Proper representation at various conditions of phase equilibria of methanol-containing mixtures (with hydrocarbons, water, etc.) is Important for oil flow assurance purposes In this work two association equations of state. CPA and sPC-SAFT, are applied to methanol-containing mixtures The purpose of this work is to investigate which association schemes (eg. two-site, three-site) should be used for methanol which will result In Successful representation of methanol-water-hydrocarbon phase equilibria Parameters from the literature as well as newly estimated parameters based on vapor pressure. liquid density, enthalpy of vaporization and compressibility factor data at e used Methanol-alkane vapor-liquid equilibrium (VLE) and liquid-liquid equilibrium (LLE) data. water-methanol VLE as well as water-methanol-hydrocarbon LLE are considered. It is concluded that the two association equations of state perform overall similarly, with the two-site association scheme being a better choice than the three-site scheme, for phase equilibrium calculations Use of the additional properties (enthalpy of vaporization and compressibility factor) in the parameter estimation has a larger effect on the performance of sPC-SAFT compared to CPA (C) 2009 Elsevier B.V. All rights reserved
Original languageEnglish
JournalFluid Phase Equilibria
Issue number1-2
Pages (from-to)128-138
Publication statusPublished - 2010


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