Abstract
The knowledge of the speciation and of the supersaturation of aqueous solutions of CO2 and NH3 is pivotal for the design and optimization of unit operations, e.g. absorption or crystallization, in the framework of ammonia-based CO2 capture systems.
Highlights
Thermodynamic models capable of computing such equilibria have been developed with the aim of designing and optimizing relevant industrial processes such as wastewater and flue gas treatment, and enhanced oil recovery.[5,6]
The speciation of aqueous ammonia solutions of BC have been assessed, investigating, in particular, the effect of a stoichiometric excess of ammonia, on the equilibria established in solution
The screening carried out in this study considered calibration models based on the maximum absorbance peak height, on the maximum absorbance peak area, and on a partial least squares regression (PLSR) of spectral data
Summary
The characterization of the CO2–NH3–H2O system in terms of the liquid phase reactions and of the solid–liquid equilibria that can be established at the relevant operating conditions is based on extensive experimental work carried out almost one hundred years ago.[1,2,3,4] thermodynamic models capable of computing such equilibria have been developed with the aim of designing and optimizing relevant industrial processes such as wastewater and flue gas treatment, and enhanced oil recovery.[5,6] As an example, the Chilled Ammonia Process (CAP) developed by Alstom Power captures greenhouse gases from large CO2 point sources such as power plants by means of aqueous ammonia solutions.[7]. Attenuated total reflection Fourier-transform infrared spectroscopy (ATR-FTIR)[12,13] has been used to measure the overall carbon concentration, as well as the equilibrium speciation in solution. The advantage of such a technique over Raman spectroscopy, used to study properties of this system,[14,15,16,17] is that it allows for liquidphase concentration monitoring exclusively, in spite of the presence of a solid phase suspended. The information retrieved has been used to estimate the solutes concentration while fulfilling the mass and charge balances in solution
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