{"title":"CO2 solubility in aqueous solution of salts: Experimental study and thermodynamic modelling","authors":"Ramin Mousavi, Antonin Chapoy, Rod Burgass","doi":"10.1002/ghg.2298","DOIUrl":"https://doi.org/10.1002/ghg.2298","url":null,"abstract":"<p>There are many economic obstacles and complex engineering problems associated with CO<sub>2</sub> capture and storage in saline aquifers that need to be addressed. Overcoming such challenges requires precise knowledge on the fluid phase equilibria of CO<sub>2-</sub>brine systems. Having accurate CO<sub>2</sub> solubility data over a wide range of temperature and pressure can greatly assist in resolving these obstacles by improving the performance and accuracy of the thermodynamic modeling and subsequent CCS engineering success.</p><p>CO<sub>2</sub> solubility in pure water and NaCl solutions has been widely studied in the literature, however, there is a lack of data on CO<sub>2</sub> solubility at lower temperatures (below 298 K). Furthermore, limited phase equilibria data are available for CO<sub>2</sub> solubility in CaCl<sub>2</sub>, MgCl<sub>2</sub>, and KCl solutions at elevated temperatures (i.e., <i>T</i> > 323.15 K).</p><p>In this work, the phase equilibria of CO<sub>2</sub> and brine systems are investigated experimentally and theoretically. In this study, solubilities of CO<sub>2</sub> in pure water and various concentrations of NaCl (10, 15, 20, and 22 wt%), KCl (10, 15, and 22 wt%), CaCl<sub>2</sub> (7.5, 10, 15.7, and 23.4 wt%), and MgCl<sub>2</sub> (6.7, 11, 18, and 29 wt%) aqueous solutions are reported. All CO<sub>2</sub> solubilities were measures at 323.15, 373.15, and 423.15 K and over various pressure ranges, while solubilities in 10 and 20 wt% NaCl aqueous solutions were also measured over the temperature range of 263 to 298 K and pressures up to the hydrate dissociation pressure of each system. Equation of state modelling using the PC-SAFT and the Cubic Plus Association equations of state, is performed in the theoretical part of the study to validate the measured solubility data. © 2024 The Author(s). <i>Greenhouse Gases: Science and Technology</i> published by Society of Chemical Industry and John Wiley & Sons Ltd.</p>","PeriodicalId":12796,"journal":{"name":"Greenhouse Gases: Science and Technology","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ghg.2298","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142429280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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