Abstract
We used Raman spectroscopy to systematically and comprehensively measure the concentrations of the main ion components (NH2COO−, HCO3−, and CO32−) in the CO2−NH3−H2O system for an initial total ammonia concentration [A] = 0.69, 0.88, 1.09, 1.34, 1.60, and 2.10 mol·L−1 and CO2 loading [C]/[A] = 0.18, 0.35, 0.43, 0.50, and 0.67, respectively. The experimental data were processed using two existing theoretical methods, and the analysis on results allowed us to propose a number of improvements based on these theoretical methods. Experimental results show that upon increasing [C]/[A], the ratios of [NH2COO−] and [CO32−] to total carbon decrease linearly, whereas the ratio of [HCO3−] to total carbon increases linearly. The reaction process can be divided into three steps. Considering the impacts of experiment errors, [A] has little effect on the relative composition of the system in the range we studied. Results calculated with a revised theoretical method are in better agreement with the experimental data.
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