CO2 Capture with Liquid-Liquid Phase Change Solvents: A Thermodynamic Study

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Extended UNIQUAC thermodynamic framework was implemented in this work to model the aqueous blend of N, N-Diethylethanolamine (DEEA) and N-Methyl-1,3-diaminopropane (MAPA) for CO2 capture. The model parameters were estimated first for the two ternary systems, H2O-DEEA-CO2 and H2O-MAPA-CO2, followed by the quaternary H2O-DEEAMAPA-CO2 system which gives liquid-liquid phase split when reacted with carbon dioxide. A total of 94 model parameters and 6 thermodynamic properties were fitted to approximately 1500 equilibrium and thermal experimental data consisting of pureamine vapor pressure (Pvap), vapor-liquid equilibrium (VLE), solid-liquid equilibrium (SLE), liquid-liquid equilibrium (LLE),excess enthalpy (HE), and heat of absorption (ΔHabs) of CO2 in aqueous amine solutions. The model developed in this work canaccurately represent the equilibrium and thermal data for the studied systems with a single unique set of parameters.
Original languageEnglish
JournalEnergy Procedia
Pages (from-to)1671 – 1681
Publication statusPublished - 2017
Event13th International Conference on Greenhouse Gas Control Technologies (GHGT-13) - Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
Duration: 14 Nov 201618 Nov 2016


Conference13th International Conference on Greenhouse Gas Control Technologies (GHGT-13)
LocationEcole Polytechnique Fédérale de Lausanne


  • Thermodynamic modeling
  • Extended UNIQUAC
  • Phase change solvents
  • DEEA
  • MAPA
  • Liquid-liquid equilibrium
  • CO2 capture

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