The knowledge of high pressure phase behavior of the CO 2 −H 2 O−NaCl system in a wide T−P−m NaCl range is of great interest in the injection of CO 2 to deep reservoir for storage or enhancement of oil recovery (EOR). The calculation of CO 2 solubility in brine is very important to predict the CO 2 storage capacity in saline aquifers. However, CO 2 solubility data at high salinity and high pressure are limited, and few thermodynamic models can accurately predict CO 2 solubility when salinity is higher than 4.5 mol/kg. In this study, a noninvasive technique, quantitative Raman spectroscopy, was used to investigate the high pressure equilibria of the CO 2 −H 2 O−NaCl system. A total of 180 solubility data points were obtained for carbon dioxide in (1, 3, and 5) mol/kg NaCl solutions from (273.15 to 473.15) K up to 40 MPa. New parameters were derived to improve the Duan-type solubility model, thus it can be applied in CO 2 sequestration and EOR to accurately calculate the solubility of CO 2 in NaCl aqueous solution up to 6 mol NaCl/kg H 2 O from (273 to 473) K, (3 to 60) MPa.

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Sulfur dioxide (SO2), a kind of acid gas pollutant, can accelerate the reaction of water and rock when it is cosequestered with CO2. The solubility of SO2 in water is essential to understand the transport and reaction behavior. However, until now, little literature was reported about the solubility of SO2 in water within wide temperature and pressure conditions. In this study, quantitative Raman spectroscopic technology was employed to determine the solubility of SO2 in water at temperatures from 263.15 to 393.15 K and pressures from 10 to 300 bar. A perturbed chain statistical associating fluid theory-based equation of state was developed to predict the solubility of SO2 in water at high pressures and temperatures. The results show that the solubility of SO2 in water increases with the increase of pressure at the pressure and temperature (P–T) condition when SO2 is in the gas-phase region, but the temperature has less effect on it. At the P–T condition when SO2 is in the liquid phase, the solubility of SO2 increases significantly with the increase of temperature.

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