The Equilibrium
Solubility of Carbon Dioxide in Aqueous Solutions of Morpholine: Experimental
Data and Thermodynamic Modeling
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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 CO<sub>2</sub> in pure morpholine were also calculated. The determined CO<sub>2</sub> equilibrium properties are in good agreement with most of the experimental
data