Solubility of CO₂ in Aqueous Solutions of NaCl at (30 to 60) °C and (10 to 20) MPa

Abstract

The solubility of CO 2 in NaCl solutions with mass fractions of 0.01 to 0.03 was measured at (30 to 60) °C and (10 to 20) MPa. The CO 2 was dissolved in NaCl solution in a pressurized vessel, and a sample of the saturated solution was removed from the vessel. The solubility was then estimated by measuring the mass of the sample and the pressure of the dissolved gas. On the basis of this experimental data, an equation for predicting the CO 2 mole fraction x 1 in NaCl solution as a function of temperature t ) (30 to 60) °C, pressure P ) (10 to 20) MPa, and mass fraction, S, of NaCl ) (0.01 to 0.03) was determined. H(P,T,S)/MPa ) 36.1P/MPa + 3.87T/K -1097.1 + (196P/MPa + 26.9T/K -8810)S, where H is Henry's coefficient, H ) P c /x 1 , P c is the partial pressure of carbon dioxide, T is the absolute temperature, and S is the mass fraction of NaCl in the aqueous solution.

Computational thermal, chemical, fluid, and solid mechanics for geosystems management.

“…The results indicate a close correspondence with the model and the solubility curves reported in Spycher and Pruess (2005). Code runs for salt-free systems also produces solubility curves that are in excellent correspondence with those presented in Spycher et al (2003) and the solubility data given by Bando et al (2003) in NaCl(aq) solutions, particularly at elevated pressures. It should be noted that CO 2(aq) volumetric and solubility data for salt-bearing systems is relatively scarce; even more so at the elevated pressures of interest for CO 2 sequestration.…”

Thermodynamic model of aqueous CO2–H2O–NaCl solutions from −22 to 100°C and from 0.1 to 100MPa

“…Moreover, the data of Rumpf et al [34] over the same T-P range but at higher concentrations of NaCl (3-4 molal) do not reveal any dependency on pressure. Likewise, the data of Bando et al [41] for NaCl concentrations up to 0.56 molal show no pressure effect between 10 and 20 MPa. In view of all this the data of Nighswander et al [30] were not included in our dataset for fitting.…”

“…The study of Bando et al [41] covers only a small range of salinities (≤0.56 molal NaCl) but it is significant in that it is one of only two literature sources with experimental results above 10 MPa (10-20 MPa; the other being Koschel et al [42]). The measurements were made using a non-reversed experimental method with a relatively long time (3 h) allowed for equilibration.…”

Measurement and modeling of the phase behavior of the (carbon dioxide+water) mixture at temperatures from 298.15K to 448.15K

“…[46]; ○, Briones et al [47]; △ Bamberger et al [30]; ▽, Bando et al [48]; ◇, Zawisza and Malesinska [29]; ☆, Zelvenskii [41]; ＋, Fischer [49]; ╳, Wiebe and Gaddy [42]; ⊕, Smith et al [50]; ■, Coan and King [43]; , Sidorov [51]; , this work. [46]; ▽, Sako et al [52]; ○, Gillespie and Wilson [44]; □, Zawisza and Malesinska [29]; ＋, Zelvenskii [41]; ☆, Coan and King [43]; ◇, Smith et al [50]; ⊕, Wiebe and Gaddy [42]; ╳ Sidorov et al [51]; ■, this work.…”