1. Simple method for determining CO2 loading of partially carbonated aqueous ammonia solutions using pH and density measurements.
- Author
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Stec, Marcin, Spietz, Tomasz, Chwoła, Tadeusz, Tatarczuk, Adam, and Krótki, Aleksander
- Subjects
AQUEOUS solutions ,CHEMICAL equilibrium ,DENSITY ,CONCENTRATION functions ,CARBON dioxide ,AMMONIA - Abstract
• The densities and pH of partially carbonated aqueous ammonia solutions were measured at 20 °C. • The relation between CO 2 loading of the solution and its pH was derived from chemical equilibrium of the NH 3 -H 2 O-CO 2 system. • Using the fact that the increase in mass is proportional to CO 2 loading, a model derived from the definition of the density. • Presented method for determining CO2 loading using pH and density measurements proved successful on real process samples. The densities and pH of partially carbonated aqueous ammonia solutions were measured at 20 °C. With increasing carbon dioxide loading, increases in density and decreases in pH were observed. These results were used to produce correlations for aqueous ammonia solution loading as a function of ammonia concentration, density, and pH. The correlations are based on first principles to increase predictive capabilities. The predictive capacity of three correlations, having different complexity, was compared. The ensemble of models using both density and pH proved to be superior to correlations based on density or pH separately. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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