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The Equilibrium Solubility of Carbon Dioxide in Aqueous Solutions of Morpholine: Experimental Data and Thermodynamic Modeling

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Center for Applied Energy Research, University of Kentucky, Lexington, Kentucky 40511, United States
Cite this: Ind. Eng. Chem. Res. 2013, 52, 14, 5221–5229
Publication Date (Web):March 13, 2013
https://doi.org/10.1021/ie303563f
Copyright © 2013 American Chemical Society

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    Abstract

    Experimental carbon dioxide solubility data in aqueous 34.8 wt % (6.14 m) and 43.5 wt % (8.85 m) morpholine solutions at 40, 60, 100, and 120 °C are presented. The solubility measurements were done in a static vapor liquid equilibrium cell by measuring total pressure. Furthermore, selected data points were confirmed using gas phase GC methodology. The obtained combined solubility data was integrated with speciation data extracted using an established titration method, for thermodynamic modeling of the system. In regression of the model parameters, the liquid phase activity coefficients were determined using the electrolyte-NRTL equations. In addition to binary and pair interaction adjustable parameters included in the electrolyte-NRTL model, the temperature dependent carbamate stability and Henry’s law constants for CO2 in pure morpholine were also calculated. The determined CO2 equilibrium properties are in good agreement with most of the experimental data.

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    Tables showing the experimental CO2 solubility data in morpholine solutions (34.8 and 43.5 wt %) and the experimental liquid phase speciation data for morpholine solutions (34.8 and 43.5 wt %) at different CO2 loadings at 21 °C. This material is available free of charge via the Internet at http://pubs.acs.org.

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