CO 2 Solubility Modelling in Non-Precipitating Aqueous Solutions of Potassium Lysinate
Résumé
Modelling of CO 2 solubility in aqueous solutions of potassium lysinate (LysK) is mainly hindered by scarcity of experimental vapor-liquid equilibrium data and lack of chemical equilibrium constants associated to the reaction mechanism for the CO 2 /LysK/H 2 O system. Therefore, Kent-Eisenberg (KE) correlation stands out from the literature, being among the most used approaches for the description of the equilibrium CO 2 partial pressure at different loadings. In this work, a Kent-Eisenberg-like approach has been developed, enhancing the empirical Kent-Eisenberg with Debye-Hückel activity coefficients in order to guide model calibration with reference to selected experimental data for CO 2 solubility in 33.1 and 33.5% w/w aqueous LysK solution; moreover, the KE edition provides an estimation of the missing equilibrium constants. This information has been embedded in a first thermodynamically sound and predictive Deshmukh-Mather (DM) model (average absolute deviation equal to 7%) validated against additional experimental data in a wide temperature and concentration range.
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