Water/CO2 System at High Pressure and Temperature Conditions: Measurement and Modeling of Density in Equilibrium Liquid and Vapor Phases

Study of the impact of high temperatures and pressures on the equilibrium densities and interfacial tension of the carbon dioxide/water system

“…This is also in accordance with what was already ascribed by several authors in the literature [6,19,25,28,29,85] and hence, the density of this phase can be fairly approximated to that of pure CO 2 [30] . On the other hand, the increase in density of the CO 2 -saturated water phase with pressure exceeds that of pure water for all isotherms investigated and it is in good agreement with the data gathered from open literature [25,28,29,85]. This increase can be divided into two regions: whether CO 2 is gaseous or liquefied/supercritical.…”

“…[85], 298 K ( ); Yaginuma et al [27], 304 K ( ); Hebach et al [28], 313 K ( ) and 333 K ( ); Kvamme et al [19], 323 K ( ); Tabasinejad et al [29], 423 K ( ); Shariat et al [25], 373 K ( ), 423 K ( ) and 477 K ( ). Solid lines represent pure density of CO 2 (a) and water (b) at pertinent temperatures obtained from correlations given in REFPROP [30].…”

“…The measured equilibrium densities values were compared to those of pure components [30] and to selected data available in the literature [19,25,[27][28][29]85] and the results are plotted in figure 5 and listed in tables S1 and S2 in supporting information. [85], 298 K ( ); Yaginuma et al [27], 304 K ( ); Hebach et al [28], 313 K ( ) and 333 K ( ); Kvamme et al [19], 323 K ( ); Tabasinejad et al [29], 423 K ( ); Shariat et al [25], 373 K ( ), 423 K ( ) and 477 K ( ).…”

“…Chiquet et al [6], Bachu and Bennion [21], Tabasinejad et al [29] and Shariat et al [25] measured the densities of the saturated phases with a vibrating-tube and the results showed that the approximation of the water-saturated vapour phase density to that of pure CO 2 [30] is in fact valid for temperatures and pressures up to 473 K and 140 MPa, respectively. However, as demonstrated by Chiquet et al [6], the effect of dissolved CO 2 on the density of the liquid aqueous phase can cause severe underestimation of the IFTs close to the density inverse conditions, where the deviations of the real (measured) density difference from that of pure substances are greatest.…”