Qualitative determination of species in DETA-H2O-CO2 system using 13C NMR spectra

C-13 NMR spectroscopic investigations were performed on aqueous solutions of diethylenetriamine (DETA) and carbon dioxide at 298.0 K. Systems with loadings ranging from 0 to 1.69 were studied. Results suggest that carbamate is one of the main species formed in the system at loadings below 1.0. At higher loadings (> 1.0), it appears that dicarbamate is dominating and HCO3-/CO32- are also formed. No clear evidence was found of any tricarbamate species in the system.