CO2 solubility in aqueous solutions containing Na+, Ca2+, Cl−, SO42− and HCO3-: The effects of electrostricted water and ion hydration thermodynamics |
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| Institution: | 1. Department of Geological Sciences, Jackson School of Geosciences, University of Texas at Austin, 2305 Speedway, Stop C1160, Austin, TX 78712, USA;2. Bureau of Economic Geology, Jackson School of Geosciences, University of Texas, 10100 Burnet Rd., Bdlg. 130, Austin, TX 78713, USA;1. School of Environmental Studies, China University of Geosciences, Wuhan 430074, China;2. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China;3. Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China;1. CICECO, Departamento de Química, Universidade de Aveiro, 3810-193 Aveiro, Portugal;2. INFOCHEM, KBC Process Technology, Unit 4, The Flag Store, 23 Queen Elizabeth Street, SE1 2LP London, UK;1. Department of Chemical and Biological Engineering, Princeton University, Princeton, NJ 08544, United States;2. Chemical Engineering Program, Texas A&M University at Qatar, P.O. Box 23874, Doha, Qatar;3. National Center for Scientific Research “Demokritos”, Institute of Nanoscience and Nanotechnology, Molecular Thermodynamics and Modelling of Materials Laboratory, GR-15310 Aghia Paraskevi Attikis, Greece;1. Institute of Research and Development, Duy Tan University, Da Nang 550000, Viet Nam;2. Computer Science Department, College of Computer and Information Sciences, Al Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh, Saudi Arabia;3. Computer Science Department, Faculty of Applied Science, Taiz University, Taiz, Yemen;4. Institute of Visual Informatics, Universiti kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia;5. Department of Chemical Engineering, Amirkabir University of Technology, Tehran, Iran |
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| Abstract: | Dissolution of CO2 into deep subsurface brines for carbon sequestration is regarded as one of the few viable means of reducing the amount of CO2 entering the atmosphere. Ions in solution partially control the amount of CO2 that dissolves, but the mechanisms of the ion's influence are not clearly understood and thus CO2 solubility is difficult to predict. In this study, CO2 solubility was experimentally determined in water, NaCl, CaCl2, Na2SO4, and NaHCO3 solutions and a mixed brine similar to the Bravo Dome natural CO2 reservoir; ionic strengths ranged up to 3.4 molal, temperatures to 140 °C, and CO2 pressures to 35.5 MPa. Increasing ionic strength decreased CO2 solubility for all solutions when the salt type remained unchanged, but ionic strength was a poor predictor of CO2 solubility in solutions with different salts. A new equation was developed to use ion hydration number to calculate the concentration of electrostricted water molecules in solution. Dissolved CO2 was strongly correlated (R2 = 0.96) to electrostricted water concentration. Strong correlations were also identified between CO2 solubility and hydration enthalpy and hydration entropy. These linear correlation equations predicted CO2 solubility within 1% of the Bravo Dome brine and within 10% of two mixed brines from literature (a 10 wt % NaCl + KCl + CaCl2 brine and a natural Na+, Ca2+, Cl− type brine with minor amounts of Mg2+, K+, Sr2+ and Br−). |
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| Keywords: | Carbon sequestration Hydration energy Hydration number Bravo Dome |
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