https://doi.org/10.1016/j.seppur.2021.118959
“Aqueous ammonia-based capture processes are among the most promising technologies for post-combustion CO2 capture. In addition to show a very competitive energetic performance compared to amine-based processes, aqueous NH3 presents advantages with respect to aqueous amine solutions [1], [2], [3], [4], i.e.: (i) it is stable in the presence of impurities and does not thermally degrade or oxidize, (ii) it has better global availability, lower environmental footprint and lower cost, and (iii) it is less corrosive and has viscosities similar to water [5] thus allowing for broad ranges of pressures for solvent regeneration and of solvent concentration in the liquid phase. However, high NH3 volatility is the main disadvantage that NH3-based capture technologies present with respect to the best performing amine solutions [6]. Consequently, measures are implemented to control the NH3 slip to the CO2-depleted Flue Gas (FG) and to the CO2 product stream, and to limit solvent losses in order to minimize fresh NH3 make-up requirements.”