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.