ABSTRACT

In this work the vapor liquid equilibria (VLE) of carbon dioxide in both taurine (KTaurate) and glycine (KGlycinate) potassium salts are measured and compared to literature data. The VLE data were measured at two salt concentrations of approximately (1 and 1.8) mol*kg 1, and at temperatures of (313, 333, 353, 373, and 393) K. The experiments were carried out in three different stirred cell reactors, all operated in batch mode to ensure the highest accuracy. The experimental results show that the CO2 partial pressure for the same loading is higher in all cases for KTaurate compared to KGlycinate. Experiments showed higher acid gas partial pressures for higher concentrations at the same temperature. Furthermore, for both solvents at 373 K the relative difference in CO2 partial pressure is greatest with a factor 2 for two solutions with the same loading. KGlycinate at 393 K showed significant degradation observed through color change and formation of gas with approximately 3 % AAS conversion in 2.5 days for a concentration of 1.7 mol*kg 1.

Compounds

#	Formula	Name
1	CO2	carbon dioxide
2	C2H4KNO2	potassium glycinate
3	C2H6KNO3S	potassium taurate
4	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	4 2	Mass density, kg/m3 ; Liquid	Molality, mol/kg - 2; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	33
POMD	4 3	Mass density, kg/m3 ; Liquid	Molality, mol/kg - 3; Liquid Temperature, K; Liquid		Liquid Crystal - 3	Vibrating tube method	33
POMD	1 4 2	Molality, mol/kg - 1 ; Liquid	Temperature, K; Liquid Solvent: Molality, mol/kg - 2; Liquid Pressure, kPa - 1; Gas		Liquid Gas	UNKNOWN	64
POMD	1 4 3	Molality, mol/kg - 1 ; Liquid	Temperature, K; Liquid Solvent: Molality, mol/kg - 3; Liquid Pressure, kPa - 1; Gas		Liquid Gas	UNKNOWN	82

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

Solubility of Carbon Dioxide in Aqueous Potassium Salts of Glycine and Taurine at Absorber and Desorber Conditions

Aldenkamp, N.[Nick], Huttenhuis, P.[Patrick], Penders-van Elk, N.[Nathalie], Hamborg, S.[Steinseth], Versteeg, G.[Geert]

ABSTRACT