The dissociation constants of the
conjugate acids of 14 amines
(diethylethanolamine, monoethanolamine, n-butyldiethanolamine, t-butyldiethanolamine, n,n-dimethylpropanolamine, methyl-diethanolamine, ethyldiethanolamine,
monoethylethanolamine, n,n-dimethylisopropanolamine,
triethanolamine, 4-methylpiperazine-1-amine, 3-morpholino propylamine,
4,2-hydroxylethylmorpholine, and triethylamine) were measured over
a temperature range between 293.15 and 333.15 K using the potentiometric
titration method. The change in standard state thermodynamic properties
was derived from the van’t Hoff equation. The influence of
the steric hindrance, number of −OH groups, and length of alkyl
chain on the dissociation constants was identified. Of the studied
amines, few sterically hindered derivatives of piperazine, a secondary
amine monoethylethanolamine, and a tertiary amine n,n-dimethylpropanolamine have high pK
a values but lower standard enthalpy than those of the
benchmark amine, monoethanolamine (MEA), and thus were deemed promising
for CO2 capture technology. Monoethylethanolamine (MEEA)
was found to have the highest basicity (pK
a) with the lowest standard state enthalpy (ΔH°/kJ·mol–1).
A comprehensive evaluation of a recently developed water-lean amine-based solvent, namely N-(2-ethoxyethyl)-3-morpholinopropan-1-amine (2-EEMPA), has been performed to analyze its post-combustion CO2 capture performance. This evaluation comprises (1) fundamental characterization of...
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