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J. Chem. Eng. Data 2007, 52, 2491
Dissociation Constants and Thermodynamic Properties of Amino Acids
Used in CO2 Absorption from (293 to 353) K
Espen S. Hamborg,† John P. M. Niederer,‡ and Geert F. Versteeg*,‡
Department of Science and Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands, and
Procede Group BV, P.O. Box 328, 7500 AH Enschede, The Netherlands
The second dissociation constants of the amino acids -alanine, taurine, sarcosine, 6-aminohexanoic acid, DL-
methionine, glycine, L-phenylalanine, and L-proline and the third dissociation constants of L-glutamic acid and
L-aspartic acid have been determined from electromotive force measurements at temperatures from (293 to 353)
K. Experimental results are reported and compared to literature values. Values of the standard state thermodynamic
properties are derived from the experimental results and compared to the values of commercially available amines
used as absorbents for CO2 capture.
1. Introduction
Aqueous solutions of amines are frequently used for the
removal of acid gases, such as CO and H S, from a variety of
2 2
gas streams. In particular, aqueous solutions of alkanolamines
and blends of alkanolamines are widely applied in gas treating.1
It has been reported that alkanolamines undergo degradation in
an oxygen atmosphere, usually encountered in the treatment of
flue gases. Aqueous amino acid salt solutions might be an
attractive alternative to alkanolamines. They have been found
to have better resistance to degradation, and their reactivity with
CO2 is comparable to aqueous alkanolamines of related classes.
Due to their ionic nature, aqueous solutions
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