Thermodynamic modeling of CO2 and H2S solubilities in aqueous DIPA solution, aqueous sulfolane-DIPA solution, and aqueous sulfolane-MDEA solution with electrolyte NRTL model

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Abstract

A thermodynamic model developed for CO2 and H2S solubilities in aqueous MDEA solution is extended to cover CO2 and H2S solubilities in aqueous DIPA solution, aqueous sulfolane-DIPA solution, and aqueous sulfolane-MDEA solution. The model makes use of the 2009 version of the electrolyte NRTL model for liquid phase activity coefficient calculations and the PC-SAFT equation of state for vapor phase fugacity coefficient calculations. The NRTL binary parameters for the molecule-electrolyte pairs required for the H2O-DIPA-CO2 ternary and the H2O-sulfolane-DIPA-CO2 quaternary are regressed against the solubility data of CO2 in aqueous DIPA solution and aqueous sulfolane-DIPA solution, respectively. The NRTL binary parameters for the molecule-electrolyte pairs required for the H2O-DIPA-H2S ternary and the H2O-sulfolane-DIPA-H2S quaternary are regressed against the solubility data of H2S in aqueous DIPA solution and aqueous sulfolane-DIPA solution simultaneously. The NRTL binary parameters for the electrolyte-electrolyte pairs involved in the H2O-DIPA-CO2-H2S quaternary are regressed against the solubility data of the acid gas mixtures in aqueous DIPA solution. Likewise, the NRTL binary parameters for the sulfolane-electrolyte pairs required for the H2O-sulfolane-MDEA-CO2 quaternary and the H2O-sulfolane-MDEA-H2S quaternary are regressed against the solubility data of the acid gases in aqueous sulfolane-MDEA solution. The predicted enthalpies of acid gas absorption are compared favorably with the literature data available for the H2O-DIPA-CO2 system, the H2O-DIPA-H2S system, and the H2O-sulfolane-MDEA-CO2 system.

Original languageEnglish
Pages (from-to)190-203
Number of pages14
JournalFluid Phase Equilibria
Volume306
Issue number2
DOIs
StatePublished - Jul 25 2011

Keywords

  • Acid gas solubility
  • Carbon dioxide
  • Diisopropanolamine
  • Electrolyte NRTL model
  • Enthalpy of absorption
  • Hydrogen sulfide
  • Methyldiethanolamine
  • Sulfolane
  • Vapor-liquid equilibrium

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