Solubility and solvation of carbon dioxide in the molten Li2CO3/Na2CO3/K2CO3 (43.5 : 31.5 : 25.0 mol-%) eutectic mixture at 973 K I. Experimental part
(1999) European Journal of Inorganic Chemistry — n° 4, p. 583-588 (1999)
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- Abstract
- The solubility of CO2 in the molten ternary eutectic mixture Li2CO3-Na2CO3-K2CO3 (43.5, 31.5, 25.0 mol.%) at 973 K has been determined by a titration technique. From the obtained titration curve, the solubility has been found to amount to 9.5.10(-2) mol.L-1 (sigma = 1.0) under a pressure of CO2 of 1 an and the pK(d) value of the carbonate melt has been evaluated to 5.37 (sigma(5) = 0.24) if the concentrations of the solutes are expressed in mol.L-1. This pK(d) value is in good agreement with literature data but the solubility value reported in this work is much higher than most of those reported in the literature. A chemical dissolution of CO2 as C2O52- is proposed and the consequences of the occurrence of this species on the acidobasic properties of molten carbonates are discussed. It appears from the experimental results that the CO2/C2O52- equilibrium in the carbonate melt is a slow process.
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Claes, P., Moyaux, D., & Peeters, D. (1999). Solubility and solvation of carbon dioxide in the molten Li2CO3/Na2CO3/K2CO3 (43.5 : 31.5 : 25.0 mol-%) eutectic mixture at 973 K I. Experimental part. European Journal of Inorganic Chemistry, 4, 583-588. https://doi.org/10.1002/(SICI)1099-0682(199904)1999:4<583::AID-EJIC583>3.0.CO;2-Y (Original work published 1999)