Thermodynamic modeling of CO2 solubility in aqueous solutions of NaCl and Na2SO4

Yizhuan Yan, Chau Chyun Chen

Research output: Contribution to journalArticle

44 Scopus citations

Abstract

A thermodynamic model based on the electrolyte NRTL activity coefficient equation and PC-SAFT equation-of-state is developed for CO2 solubility in aqueous solutions of NaCl and Na2SO4 with temperature up to 473.15 K, pressure up to 150 MPa, and salt concentrations up to saturation. The Henry's constant parameters of CO2 in H 2O and the characteristic volume parameters for CO2 required for pressure correction of Henry's constant are identified from fitting the experimental gas solubility of CO2 in pure water with temperature up to 473.15 K and pressure up to 150 MPa. The NRTL binary parameters for the CO2-(Na+, Cl-) pair and the CO2-(Na+, SO42-) pair are regressed against the experimental VLE data for the CO2-NaCl-H2O ternary system up to 373.15 K and 20 MPa and the CO2-Na 2SO4-H2O ternary system up to 433.15 K and 13 MPa, respectively. Model calculations on solubility and heat of solution of CO2 in pure water and aqueous solutions of NaCl and Na 2SO4 are compared to the available experimental data of the CO2-H2O binary, CO2-NaCl-H2O ternary and CO2-Na2SO4-H2O ternary systems with excellent results.

Original languageEnglish
Pages (from-to)623-634
Number of pages12
JournalJournal of Supercritical Fluids
Volume55
Issue number2
DOIs
StatePublished - Dec 2010

Keywords

  • Carbon dioxide
  • Electrolyte NRTL model
  • Gas solubility
  • PC-SAFT equation-of-state
  • Sodium chloride
  • Sodium sulfate

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