Predicting Solubility of Oxides of Metals and Metalloids in Supercritical Water

The solubility of oxides of metals and metalloids in water can be considered as a reaction of hydration with the formation of hydroxides species, like Al­(OH)3·H2O, Si­(OH)4, B­(OH)3, etc. Calculation of solubility requires, along with the equilibrium constant of the dissolution reaction in the idea...

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Bibliographic Details
Published in:Industrial & engineering chemistry research 2020-01, Vol.59 (2), p.970-980
Main Author: Plyasunov, Andrey V
Format: Article
Language:English
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Summary:The solubility of oxides of metals and metalloids in water can be considered as a reaction of hydration with the formation of hydroxides species, like Al­(OH)3·H2O, Si­(OH)4, B­(OH)3, etc. Calculation of solubility requires, along with the equilibrium constant of the dissolution reaction in the ideal gas state, knowledge of the fugacity coefficients, φ2 ∞, for aqueous species. This work describes simple ways of estimating fugacity coefficients for such species in water of various pressures/densities, based on the stoichiometry of hydroxides or the corresponding-states correlation. The method is verified by satisfactorily predicting the solubility of quartz, SiO2, at 647.1–773 K, and the pressure dependence of solubility of corundum, Al2O3, at 973 K in water up to 2000 MPa. A few experimental data points, if available, may significantly improve the accuracy of the proposed method.
ISSN:0888-5885
1520-5045
DOI:10.1021/acs.iecr.9b06542