Solubility of CO2 in aqueous solutions of CaCl2 or MgCl2 and in a synthetic formation brine at temperatures up to 423 K and pressures up to 40 MPa

Danlu Tong, J. P. Martin Trusler, David Vega-Maza

Research output: Contribution to journalArticle

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Abstract

We report the solubility of carbon dioxide in CaCl2(aq) and MgCl2(aq) at molalities of (1, 3, and 5) mol·kg–1, temperatures of (308 to 424) K and pressures up to 40 MPa. We also report the solubility of CO2 in a synthetic formation brine containing 0.910 mol·kg–1 NaCl and 0.143 mol·kg–1 KCl over the same ranges of temperature and pressure. The expanded uncertainties at 95 % confidence are 0.03 K in temperature, between (0.08 and 0.15) MPa in bubble pressure and 0.00015 in the mole fraction of CO2 in the solution at its bubble point. The results show a strong salting-out effect, whereby the solubility declines with increasing molality of salt, which is some (20 to 30) % greater in CaCl2(aq) or MgCl2(aq) than in the synthetic formation brine at the same molality.
Original languageEnglish
Pages (from-to)2116–2124
Number of pages9
JournalJournal of Chemical and Engineering Data
Volume58
Issue number7
Early online date30 May 2013
DOIs
Publication statusPublished - 11 Jul 2013

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Magnesium Chloride
Solubility
Bubbles (in fluids)
Carbon Dioxide
Temperature
Carbon dioxide
Salts
brine

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Solubility of CO2 in aqueous solutions of CaCl2 or MgCl2 and in a synthetic formation brine at temperatures up to 423 K and pressures up to 40 MPa. / Tong, Danlu; Trusler, J. P. Martin; Vega-Maza, David.

In: Journal of Chemical and Engineering Data, Vol. 58, No. 7, 11.07.2013, p. 2116–2124.

Research output: Contribution to journalArticle

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abstract = "We report the solubility of carbon dioxide in CaCl2(aq) and MgCl2(aq) at molalities of (1, 3, and 5) mol·kg–1, temperatures of (308 to 424) K and pressures up to 40 MPa. We also report the solubility of CO2 in a synthetic formation brine containing 0.910 mol·kg–1 NaCl and 0.143 mol·kg–1 KCl over the same ranges of temperature and pressure. The expanded uncertainties at 95 {\%} confidence are 0.03 K in temperature, between (0.08 and 0.15) MPa in bubble pressure and 0.00015 in the mole fraction of CO2 in the solution at its bubble point. The results show a strong salting-out effect, whereby the solubility declines with increasing molality of salt, which is some (20 to 30) {\%} greater in CaCl2(aq) or MgCl2(aq) than in the synthetic formation brine at the same molality.",
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AB - We report the solubility of carbon dioxide in CaCl2(aq) and MgCl2(aq) at molalities of (1, 3, and 5) mol·kg–1, temperatures of (308 to 424) K and pressures up to 40 MPa. We also report the solubility of CO2 in a synthetic formation brine containing 0.910 mol·kg–1 NaCl and 0.143 mol·kg–1 KCl over the same ranges of temperature and pressure. The expanded uncertainties at 95 % confidence are 0.03 K in temperature, between (0.08 and 0.15) MPa in bubble pressure and 0.00015 in the mole fraction of CO2 in the solution at its bubble point. The results show a strong salting-out effect, whereby the solubility declines with increasing molality of salt, which is some (20 to 30) % greater in CaCl2(aq) or MgCl2(aq) than in the synthetic formation brine at the same molality.

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