2.3. Speciation studies
1H and 13C NMR spectroscopy was applied to qualitatively study the substances present in the liquid phase inside the bubble column reactor during the chemical absorption of carbon dioxide for the different solvents used in this work. The MestrReC 4.7 software developed by MestreLab Research was used for spectra processing. Spectra were acquired on 300 MHz Varian Mercury spectroscopy. Samples of amine solution were taken from the middle zone of reactor system. Deuterated water (D2O) was used as internal reference for the processing of 1H NMR and tetradeuterated methanol (CD3OD) as internal reference for the processing of 13C NMR.