- Title
- Protonation constants and thermodynamic properties of amines for post combustion capture of CO₂
- Creator
- Fernandes, Debra; Conway, William; Wang, Xiaoguang; Burns, Robert; Lawrance, Geoffrey; Maeder, Marcel; Puxty, Graeme
- Relation
- Journal of Chemical Thermodynamics Vol. 51, Issue August, p. 97-102
- Publisher Link
- http://dx.doi.org/10.1016/j.jct.2012.02.031
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2012
- Description
- The leading process for the post combustion capture (PCC) of CO₂ from coal-fired power stations and hence reduction in greenhouse gases involves capture by aqueous amine solutions. Of the reactions that occur in solution, which include CO₂ hydration, de-protonation of carbonic acid, amine protonation and carbamate formation, the protonation of the amine in the absorber and its subsequent de-protonation in the stripper involve the greatest enthalpy changes. In this study, protonation constants (reported as log10Kprot) of selected series of primary, secondary and tertiary alkanolamines/amines over the temperature range 288–318 K are reported. Selected series studied involve primary, secondary and tertiary mono-, di- and tri-alkanolamines, secondary amines including heterocyclic species, and both –CH₂OH and –CH₂CH₂OH substituted piperidines. van’t Hoff analyses have resulted in the standard molar enthalpies, ΔHmo, and molar entropies, ΔSmo, of protonation. Trends in ΔHmo are correlated with systematic changes in composition and structure of the selected series of amines/alkanolamines, while ΔHmo–ΔSmo plots generated linear correlations for the mono-, di-, and tri-alkanolamines, the –CH₂OH and –CH₂CH₂OH substituted piperidines, and the alkylamines. These relationships provide a guide to the selection of an amine(s) solvent for CO₂ capture, based on a greater difference in log10Kprot between the absorber and stripper temperatures.
- Subject
- post combustion capture of CO₂; amine protonation constants; standard molar enthalpy of protonation; standard molar entropy of protonation; CO₂ absorption
- Identifier
- http://hdl.handle.net/1959.13/1327327
- Identifier
- uon:25635
- Identifier
- ISSN:0021-9614
- Language
- eng
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