Influence of pressure on CO2 solubility using EDA

https://doi.org/10.3390/en14206822

“Figure 2 shows the typical curves obtained during the CO₂ solubility tests. Figure 2a represents the drop in pressure as a function of time, where the pressure stabilization was achieved in the first 3 h. The final pressure reached corresponds to the equilibrium pressure at the conditions of CO₂ saturation in water, since these values were close to the equilibrium pressure estimated by the semi-empirical model of CO₂ solubility proposed by Ricaurte et al. [39] applied to each initial pressure studied (700, 2100, 3500 KPa). Figure 2b shows the CO₂ removed from the gas phase as a function of time. The amount of CO₂ solubilized into the water was proportional to the initial pressure, due to a higher driving force. The CO₂ solubility tests indicated that it is possible in non-stirred systems to achieve pressure stabilization in short times (<4 h), up until equilibrium conditions are reached in the saturation of CO₂ into water. In contrast, Farajzadeh et al. [40] reported pressure stabilization for a time >48 h in high-pressure CO₂ solubilization tests in quiescent conditions. Our experimental system’s main distinction was the initial bubbling of CO₂ into the liquid solution, significantly reducing the time required for liquid saturation in non-stirred experimental setups [41].”