Experimental studies and modeling of CO2 solubility in high temperature aqueous CaCl2, MgCl2, Na2SO4, and KCl solutions

Haining Zhao, Robert M. Dilmore, Serguei Lvov

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The phase equilibria of CO2 and aqueous electrolyte solutions are important to various chemical-, petroleum-, and environmental-related technical applications. CO2 solubility in aqueous CaCl2, MgCl2, Na2SO4, and KCl solutions at a pressure of 15 MPa, the temperatures from 323 to 423 K, and the ionic strength from 1 to 6 mol kg-1 were measured. Based on the measured experimental CO2 solubility, the previous developed fugacity-activity thermodynamic model for the CO2-NaCl-H2O system was extended to account for the effects of different salt species on CO2 solubility in aqueous solutions at temperatures up to 523 K, pressures up to 150 MPa, and salt concentrations up to saturation. Comparisons of different models against literature data reveal a clear improvement of the proposed PSUCO2 model in predicting CO2 solubility in aqueous salt solutions.

Original languageEnglish (US)
Pages (from-to)2286-2297
Number of pages12
JournalAIChE Journal
Volume61
Issue number7
DOIs
StatePublished - Jul 1 2015

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Magnesium Chloride
Solubility
Temperature
Salts
Pressure
Petroleum
Ionic strength
Thermodynamics
Phase equilibria
Osmolar Concentration
Electrolytes
Crude oil

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Environmental Engineering
  • Chemical Engineering(all)

Cite this

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abstract = "The phase equilibria of CO2 and aqueous electrolyte solutions are important to various chemical-, petroleum-, and environmental-related technical applications. CO2 solubility in aqueous CaCl2, MgCl2, Na2SO4, and KCl solutions at a pressure of 15 MPa, the temperatures from 323 to 423 K, and the ionic strength from 1 to 6 mol kg-1 were measured. Based on the measured experimental CO2 solubility, the previous developed fugacity-activity thermodynamic model for the CO2-NaCl-H2O system was extended to account for the effects of different salt species on CO2 solubility in aqueous solutions at temperatures up to 523 K, pressures up to 150 MPa, and salt concentrations up to saturation. Comparisons of different models against literature data reveal a clear improvement of the proposed PSUCO2 model in predicting CO2 solubility in aqueous salt solutions.",
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Experimental studies and modeling of CO2 solubility in high temperature aqueous CaCl2, MgCl2, Na2SO4, and KCl solutions. / Zhao, Haining; Dilmore, Robert M.; Lvov, Serguei.

In: AIChE Journal, Vol. 61, No. 7, 01.07.2015, p. 2286-2297.

Research output: Contribution to journalArticle

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