Amine Solutions for Biogas Upgrading: Ideal versus Non-Ideal Absorption Isotherms

E. I. Privalova, P. Mäki-Arvela, K. Eränen, A. K. Avetisov, J. P. Mikkola, D. Yu Murzin*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

14 Citations (Scopus)


Amine solutions were applied in carbon dioxide removal from a model mixture of biogas, carried out in a loop reactor system. In addition, the effect of CO2 absorption acceleration in the presence of piperazine was confirmed and quantified, relating the obtained CO2 loading with the piperazine concentration. Further, the interactions of CO2 and water in aqueous amine solutions were discussed. The obtained acid gas loadings were accurately described taking into account the effect of the dissolved CO2 on the equilibrium constant. A logarithmic absorption isotherm that follows from such considerations and a saturation-type isotherm were compared. In describing the experimental data, advantages and disadvantages of both approaches are discussed.

Original languageEnglish
Pages (from-to)740-748
Number of pages9
JournalChemical Engineering and Technology
Issue number5
Publication statusPublished - Apr 2013
MoE publication typeA1 Journal article-refereed


  • Amine solutions
  • Biogas upgrading
  • CO2 capture
  • Piperazine


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