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C 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 HCO 3 -/CO 3 2are also formed. No clear evidence was found of any tricarbamate species in the system.

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8A blend of a tertiary amine (DEEA) and a diamine (MAPA) was studied in 9 a screening apparatus for preliminary absorption tests. Two immiscible liquid 10 phases were formed upon CO 2 loading and the system was shown to have large 11 capacity for CO 2 . The two phases were analyzed individually for both amines 12 and CO 2 . MAPA and water were found concentrated in the heavy CO 2 rich 13 phase whereas the CO 2 lean phase contained mainly of DEEA. Volumetric phase give good estimates for the absorption rate at higher loadings.

Monoethanolamine (MEA) is commonly used as a benchmark for solvent development within postcombustion CO2 capture. The physical properties data for this system are scarce, especially for loaded solutions. In this paper new measurements of physical properties (density, viscosity, and physical N2O solubility) of unloaded and loaded solutions are presented. Available literature data were collected, and semiempirical models were developed and shown to represent all experimental data very well.

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Abstract2-(Diethylamino)ethanol (DEEA) and 3-(Methylamino) propylamine (MAPA) in combination may represent a promising absorbent system for CO 2 capture due to high CO 2 loading capacity, high equilibrium temperature sensitivity, low energy requirement for regeneration and relatively high reaction rate.Three different systems: DEEA-CO 2 -H 2 O; MAPA-CO 2 -H 2 O and DEEA-MAPA-CO 2 -H 2 O were studied quantitatively by NMR spectroscopy and the data are reported in the present work. The main products quantified for these systems are: carbonate-bicarbonate for the DEEA-CO 2 -H 2 O system; primary, secondary carbamate, dicarbamate for the MAPA-CO 2 -H 2 O system, and primary/ secondary carbamate, dicarbamate, carbonate/bicarbonate in blended DEEA-MAPA-CO 2 -H 2 O. The speciation data of the three systems were measured and reported in the present work. The blended system of 5M DEEA-2M MAPA can form two liquid phases after being loaded with CO 2 and both phases were analyzed quantitatively by NMR spectroscopy. The experimental data shows that the lower phase is rich in CO 2 and MAPA while the upper phase was lean in CO 2 and rich in DEEA. The ratio DEEA-MAPA in the lower phase increases with increasing partial pressure whereas for the upper phase the opposite is true.