ABSTRACT

Freezing points for aqueous monoethanolamine (MEA), methyl diethanolamine (MDEA), and MEA-MDEA solutions were measured in the concentration range from 0 to 0.4 mass fractions of the alkanolamines. For the aqueous MEA-MDEA system, freezing points for 1:4, 1:2, 1:1, 2:1, and 4:1 molar ratios of MEA/MDEA were determined. The experimental values indicate that the MDEA-water interaction is stronger than the MEA-water interaction. Measurements were carried out by a new modified Beckmann apparatus, which has not previously been described. The apparatus and method proved to have good repeatability and accuracy. A correlation of the freezing points as functions of the solution composition was made. Measurements of aqueous MEA and aqueous MDEA were compared to experiments found in the open literature.

Compounds

#	Formula	Name
1	C2H7NO	2-aminoethan-1-ol
2	C5H13NO2	N-methyldiethanolamine
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 3	Solid-liquid equilibrium temperature, K ; Liquid	Mass fraction - 1; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 3	Large-sample thermal analysis	11
POMD	2 3	Solid-liquid equilibrium temperature, K ; Liquid	Mass fraction - 2; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 3	Large-sample thermal analysis	12
POMD	2 1 3	Solid-liquid equilibrium temperature, K ; Liquid	Mass fraction - 1; Liquid Mass fraction - 2; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 1	Large-sample thermal analysis	32

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

Freezing Point Depressions of Aqueous MEA, MDEA, and MEA-MDEA Measured with a New Apparatus

Fosbol, P. L.[Phillip L.], Pedersen, M. G.[Mikkel Gielsager], Thomsen, K.[Kaj]

ABSTRACT