Das Zweiphasengebiet und die kritische Kurve im System Kohlendioxid–Wasser bis zu Drucken von 3500 bar

A Phase-Partitioning Model for CO2–Brine Mixtures at Elevated Temperatures and Pressures: Application to CO2-Enhanced Geothermal Systems

“…Note that at 300 • C, the dew point data of Blencoe et al (2001) are well reproduced up to pressures of about 500 bar, above which the model reliability should be questioned as full miscibility is approached (according to Blencoe et al 2001, the critical line at 300 • C occurs at about 567 bar). Note that at 300 • C and pressures above 500 bar, the CO 2 solubilities measured by Blencoe et al (2001) agree well with those determined by Takenouchi and Kennedy (1964), but differ significantly from the measurements of Tödheide and Frank (1963). Blencoe et al (2001) discussed at length the discrepancies between the results of these authors, and evaluated potential reasons for these discrepancies.…”

“…6 and 7). As evidenced by earlier investigations (Tödheide and Frank 1963;Takenouchi and Kennedy 1965;Gehrig et al 1986), the presence of dissolved salts significantly raises the critical line of the CO 2 -H 2 O mixture.…”

“…1 and 2). The latter are not reproduced very well, and the model appears in much better agreement with the water solubilities determined by Tödheide and Frank (1963). At and below 260 • C, the data of Todheide and Frank display a good continuity with the water solubilities measured at lower pressures by Müller et al (1988) and Gillepsie and Wilson (1982).…”

“…1 and 2). The computed aqueous CO 2 concentrations Gillepsie and Wilson (1982) 93-260 7-203 Sako et al (1991) 148 102-197 Malinin and Kurovskaya (1975) 100,150 48 Müller et al (1988) 100-200 3-81 Takenouchi and Kennedy (1964) 110-300 100-600 Takenouchi and Kennedy (1965) 150-300 100-600 Coan and King (1971) 100 37-52 Drummond (1981) 100-305 58-195 Blencoe et al (2001) 300 276-567 Nighswander et al (1989) 120-198 21-102 Malinin (1959) 200-300 98-588 Shagiakhmetov and Tarzimanov (1981) 100,150 100-600 Tödheide and Frank (1963) 100-300 200-600…”

“…The computed water solubilities in compressed CO 2 yield a larger RMSD of about 17%, in large part due to the noticeable divergence between the gas-phase data reported by Tödheide • C up to 300 • C and 600 bar. Note that at 300 • C, the model starts to break down above about 500 bar, as full miscibility is approached (the critical curve at 300 • C is reached at around 567 bar; Blencoe et al 2001) and Frank (1963) and Kennedy (1964, 1965) (right side of Figs. 1 and 2).…”