Experimental study on CO2 solubility in aqueous Piperazine/alkanolamines solutions at stripper conditions

Shota Inoue*, Takuya Itakura, Takao Nakagaki, Yukio Furukawa, Hiroshi Sato, Yasuro Yamanaka

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

13 Citations (Scopus)


Vapor liquid equilibrium (VLE) experiments using pressurized vessel operated at wide range of temperatures from 40 °C to 120 °C were conducted with four binary solutions of Piperazine (PZ) and alkanolamines, which are 2- Isopropylaminoethanol (IPAE), Monoethanolamine (MEA), Diethanolamine (DEA) and Methyldiethanolamine (MDEA). Effective CO2 loadings of some PZ based binary solutions, which meant the difference between the CO 2 loadings at the consistent absorber and stripper conditions, increased in comparison with the PZ only solution and especially, PZ/MDEA showed the largest effective CO2 loading. CO2 loadings at the stripper condition did not depend on additive amount of MDEA to PZ and was the same CO2 loading as PZ only solution, while those increased with increase in MDEA concentration at the absorber condition. According to the reaction products analysis for PZ/MDEA samples operated at different temperature by using 13C-NMR spectroscopy, the bicarbonate in the solution decreased significantly with increase in temperature, but the PZ carbamate dissociated CO2 much less than the carbamate even at 120 °C.

Original languageEnglish
Pages (from-to)1751-1759
Number of pages9
JournalEnergy Procedia
Publication statusPublished - 2013
Event11th International Conference on Greenhouse Gas Control Technologies, GHGT 2012 - Kyoto, Japan
Duration: 2012 Nov 182012 Nov 22


  • Amine absorbent
  • Piperazine
  • Stripper
  • VLE

ASJC Scopus subject areas

  • Energy(all)


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