The solubility of CO2+H2S mixtures in water and 2M NaCl at 120°C and pressures up to 35MPa

Subsurface geochemical fate and effects of impurities contained in a CO2 stream injected into a deep saline aquifer: What is known

“…Although most of the validation of the model of Ziabakhsh-Ganji and Kooi (2012) are simply comparisons against other, more complex, models, their work demonstrates that, to the extent that experimental data are available, simple models can reproduce at least the gross behaviour of trace gas/brine systems. Acquisition of new phase composition data in this system (e.g., Savary et al, 2012) can further validate; or reveal weaknesses of the model.…”

Effects of H2S injection on the CO2-brine-sandstone interaction under 21 MPa and 70 °C

“…However, with the H 2 S co-injection, the original dynamics between aqueous CO 2 and carbonic acid was interrupted. The aqueous solubility of H 2 S (2.78 mol kg H20 -1 ) in the brine was 3.3 times higher than that of CO 2 (0.82 mol kg H20 -1 ) (Savary et al, 2012), H 2 S would almost stripped from the supercritical CO 2 phase after the co-injection of H 2 S-CO 2 . Thus, H 2 S dissociated into HS − , produced H + and made the pH decreased.…”

“…Compared with pure CO 2 injection, the co-injection of H 2 S-CO 2 mixtures enables the bulk solution to maintain lower pH for decades of years (Xu et al, 2007). As a result, the capacity for solubility trappings of CO 2 in pure water or saline water could be decreased (Savary et al, 2012). Furthermore, some experimental and modelling work has been done examining chemical interaction of H 2 S-CO 2 mixtures with limestone (Kaszuba et al, 2011a), dolomites (Glezakou et al, 2012) and basalts (Schaef et al, 2013).…”

Prediction of H2S solubility in aqueous NaCl solutions by molecular simulation

“…To calculate phase equilibrium of H 2 S + brine systems, actually most of the available basin or reservoir modeling tools use empirical correlations (e.g. Barta and Bradley, 1985;Savary et al, 2012;Suleimenov and Krupp, 1994), activity coefficient models (e.g. Barrett et al, 1988;Dubessy et al, 2005;Li et al, 2014;Xia et al, 2000) or equations of state (e.g.…”

“…A recent compilation (Koschel et al, 2013) indicates that around 700 experimental data of H 2 S solubility in NaCl aqueous solutions are available in literature (Barrett et al, 1988;Douabul and Riley, 1979;Drummond, 1981;Kozintseva, 1963;Savary et al, 2012;Suleimenov and Krupp, 1994;Xia et al, 2000), but three quarters of them are for pressures less than 5 MPa. Actually the maximum experimental pressure investigated for H 2 S solubility in brine is close to 30 MPa (Koschel et al, 2013;Savary et al, 2012), and the temperatures investigated are in a large majority less than 393 K, very far from conditions encountered in geological formations where TSR is expected to occur (Machel, 2001). Due to high toxicity and corrosiveness of this gas, experiments at high pressure are hazardous and expensive.…”