ABSTRACT

Different thermodynamic properties of aqueous solutions of butyltriacetonediamine (BuTAD), unloaded and loaded with carbon dioxide, are studied experimentally. For unloaded mixtures of BuTAD and water, protonation equilibrium constants between 283 and 333 K and liquid liquid equilibria between 313 and 353 K, including the lower critical point, are determined at atmospheric pressure. Furthermore, the solubility of carbon dioxide in aqueous solutions of BuTAD between 313 and 393 K is determined at low loadings with an analytic method based on headspace gas chromatography and at high loadings with a synthetic method using a high pressure view cell. In the loaded system, solid precipitation, liquid liquid phase split, and the presence of metastable states are observed in certain ranges. The data is interesting for assessing the aqueous solution of BuTAD as solvent for carbon capture. A short-cut method is used for comparing the new solvent with an aqueous solution of monoethanolamine (MEA) with respect to the energy requirement of an absorption/desorption process for CO2 scrubbing. Furthermore, a new and simple gas chromatographic method for determining the loading with carbon dioxide of aqueous solutions of amines is described.

Compounds

#	Formula	Name
1	C13H28N2	N-butyl-2,2,6,6-tetramethylpiperidin-4-amine
2	CO2	carbon dioxide
3	H2O	water

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Constraint	Phase	Method	#Points
POMD	1	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid		Liquid Gas	Ebulliometric method (Recirculating still)	7
POMD	3 1	Mass fraction - 1 ; Liquid mixture 1	Temperature, K; Liquid mixture 1	Pressure, kPa; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	Titration method	6
POMD	3 1	Mass fraction - 1 ; Liquid mixture 2	Temperature, K; Liquid mixture 1	Pressure, kPa; Liquid mixture 1	Liquid mixture 2 Liquid mixture 1	Titration method	6
POMD	2 3 1	Molality, mol/kg - 2 ; Liquid	Pressure, kPa - 2; Gas	Temperature, K; Liquid Molality, mol/kg - 1; Liquid	Liquid Gas	chromatography	6
POMD	2 3 1	Molality, mol/kg - 2 ; Liquid	Temperature, K; Liquid Pressure, kPa - 2; Gas	Molality, mol/kg - 1; Liquid	Liquid Gas	headspace GC	34
POMD	2 3 1	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid Molality, mol/kg - 2; Liquid	Molality, mol/kg - 1; Liquid	Liquid Gas	Closed cell (Static) method	12

Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

Thermodynamic Study of a Complex System for Carbon Capture: Butyltriacetonediamine + Water + Carbon Dioxide

Vasiliu, D.[Dan], Yazdani, A.[Amir], McCann, N.[Nichola], Irfan, M.[Muhammad], Schneider, R.[Rolf], Rolker, J.[Jorn], Maurer, G.[Gerd], Harbou, E. v.[Erik von], Hasse, H.[Hans]

ABSTRACT