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• 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]

Institute for Chemical Processing of Coal in cooperation with industrial partners: TAURON Polska Energia S.A. and TAURON Wytwarzanie S.A. designed, constructed and operated pilot plant at Łaziska Power Plant in Łaziska Górne, Poland. The carbon capture facility is based on amine post-combustion process technology and used 30 wt% aqueous ethanolamine solvent. Approximately 1000 kilograms of CO 2 can be captured per day from flue gas stream of 200 m 3 /h of a 225MWe hard coal fired boiler. The plant captured its first tonne of CO 2 in August 2013. The purpose of this study is to present initial results from tests carried out at Łaziska Power Plant using different process flow sheets: heat-integrated stripping column and split flow process. The tests provide valuable experimental evidence for modifications described in the literature, mainly through modelling and demonstrate that flow sheet modifications, despite the increase in plant complexity, are worth to consider. [ABSTRACT FROM AUTHOR]