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Dissociation Constants of Protonated Amines in Water at Temperatures from 293.15 K to 343.15 K

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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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Authors and Affiliations

  1. Laboratoire de Thermodynamique et Interactions Moléculaires, Clermont Université, Université Blaise Pascal, BP 10448, 63000, Clermont-Ferrand, France

    M. R. Simond, K. Ballerat-Busserolles, Y. Coulier, L. Rodier & J.-Y. Coxam

  2. Laboratoire de Thermodynamique et Interactions Moléculaires, CNRS, UMR 6272, 63173, Aubiere, France

    M. R. Simond, K. Ballerat-Busserolles, Y. Coulier, L. Rodier & J.-Y. Coxam

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  1. M. R. Simond
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  2. K. Ballerat-Busserolles
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  3. Y. Coulier
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  4. L. Rodier
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  5. J.-Y. Coxam
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Correspondence to K. Ballerat-Busserolles.

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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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