BaO-BaF₂系融体への炭酸ガスの溶解度

抄録

Equilibrium CO₂ partial pressures in the systems BaO-BaCO₃ and BaO-BaCO₃-BaF₂ were measured by using the thermo-balance. The results are summarized as follows,
(1) Dissociation of BaCO₃ under P_CO2 = 1 atm occurs at 1645 K and the temperature decreases with decreasing the partial pressure of CO₂.
(2) Interaction parameter on the assumption of regular solution for BaO-BaCO₃ melts changed from -23 kJ/mol at 1598 K to -15 kJ/mol at 1773 K.
(3) Gibbs energy of the reaction BaO (melt) + CO₂(g) = BaCO₃(melt)ΔG°is given by the following relation,
ΔG°=-0.152T + 279(kJ/mol)
(4) Assuming that BaO-BaCO₃-BaF₂ melts behave as the regular solution, the calculated values of solubility of CO₂ in BaO-BaF₂ melts are fairly in good agreement with measured ones except for those under P_CO2 = 1 atm.