Distribution of MEG and methanol in well-defined hydrocarbon and water systems: Experimental measurement and modeling using the CPA EoS

Muhammad Riaz, Mustafe A. Yussuf, Georgios Kontogeorgis, Erling Halfdan Stenby, Wei Yan, Even Solbraa

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Liquid-liquid equilibria data for two binary and two ternary systems are reported in the temperature range of 303.15-323.15. K at atmospheric pressure. The binary systems measured are n-nonane + MEG and ethylbenzene + MEG and the ternary systems are n-nonane + MEG + water and ethylbenzene + MEG + water. These data are satisfactorily correlated (binaries) and predicted (ternaries) using Cubic Plus Association (CPA) equation of state (EoS). CPA is also applied to binary LLE of aromatic hydrocarbon + water and VLE of methane + methanol. Finally the distribution of water and inhibitors (methanol and MEG) in various phases is modeled using CPA. The hydrocarbon phase consists of mixture-1 (methane, ethane, n-butane) or mixture-2 (methane, ethane, propane, n-butane, n-heptane, toluene and n-decane). CPA can satisfactorily predict the water content in the gas phase of the multicomponent systems containing mixture-1 over a range of temperatures and pressures. Similarly the methanol content in the gas phase of mixture-1 + water + methanol systems is predicted satisfactorily with accuracy within experimental uncertainty. For VLLE of mixture-2. +. water, mixture-2 + MEG + water and mixture-2 + methanol + water systems, the organic phase compositions are satisfactorily predicted whereas modeling results are relatively less satisfactory for the vapor phase compositions partially due to uncertainties in the experimental data. © 2012 Elsevier B.V.
Original languageEnglish
JournalFluid Phase Equilibria
Pages (from-to)298-310
Publication statusPublished - 2013


  • Atmospheric pressure
  • Binary mixtures
  • Butane
  • Ethane
  • Ethylbenzene
  • Glycol
  • Methane
  • Organic compounds
  • Phase equilibria
  • Propane
  • Ternary systems
  • Toluene
  • Uncertainty analysis
  • Vapors
  • Waterworks
  • Methanol
  • CPA
  • Vapor–liquid equilibrium
  • Vapor–liquid–liquid equilibrium

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