Abstract
The dissociation constants of protonated 2-amino-1-ethanol (MEA), diethanol amine (DEA), triethanol amine (TEA), methyldiethanol amine (MDEA), 2-amino-2-methyl-1-propanol (AMP), 3-dimethylamino-1-propanol (DMAP), tris(hydromethyl)aminomethane (THAM), 2-[2-(dimethylamino)ethoxy]ethanol (DMAEOE) and, 1,2-bis(2-aminoethoxy)ethane (DiAEOE) were determined in the temperature range 293.15 to 343.15 K using a potentiometric titration method. The experimental technique was first validated using as reference the available literature data of MDEA. The dissociation enthalpies of amines were derived from their dissociation constants using the Van’t Hoff equation. Experimental dissociation constants and dissociation enthalpies were discussed in term of amine structure and compared with literature values when available.
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Abbreviations
- K :
-
dissociation constant
- Δd H ∘ :
-
standard enthalpies of dissociation
- ρ w :
-
volumic mass of pure water
- A,B,C :
-
adjustable parameters for Eq. 8
- a :
-
activity
- γ :
-
activity coefficient
- m :
-
molality
- c :
-
molarity
- n :
-
mole number
- n 0 :
-
initial mole number
- z :
-
charge number
- k :
-
ionic radius parameter
- T :
-
temperature
- A D,B D :
-
Debye–Hückel constants
- I :
-
ionic strength
- σ,s :
-
standard deviation
- Am:
-
amine
- AmH+ :
-
protonated amine
- H+ :
-
hydrogen ion
- OH− :
-
hydroxide ion
- Cl− :
-
chloride ion
- w:
-
water
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Acknowledgements
The work was supported by the French National Research Agency (ANR) in the post combustion capture project CAPCO2.
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Simond, M.R., Ballerat-Busserolles, K., Coulier, Y. et al. Dissociation Constants of Protonated Amines in Water at Temperatures from 293.15 K to 343.15 K. J Solution Chem 41, 130–142 (2012). https://doi.org/10.1007/s10953-011-9790-3
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DOI: https://doi.org/10.1007/s10953-011-9790-3