Thermal Degradation Pathways of Aqueous Diamine CO2 Capture Solvents

Jesse Thompson, Henry Richburg, Kunlei Liu

Research output: Contribution to journalConference articlepeer-review

8 Scopus citations


Diamines have shown promise as CO2 capture solvents, yet very little is known about their pathway for thermal degradation. In this study, diamine thermal degradation was quantitatively monitored in lab-scale experiments on four aqueous diamine solvents; ethylenediamine (EDA) 1,2-propanediamine (1,2-DAP), 1,3-diaminopropane (1,3-DAP) and N-methyl-1,2-ethanediamine (N-MEDA), to gain a more comprehensive understanding of their degradation pathway(s). The major degradation products were identified by high resolution time-of-flight mass spectrometry (TOF-MS). Degradation pathways were proposed showing that the primary thermal degradation route for this class of amine are through carbamate formation followed by intermolecular cyclization to form an imidazolidinone or nucleophilic attack by a free amine to form a diamine urea.

Original languageEnglish
Pages (from-to)2030-2038
Number of pages9
JournalEnergy Procedia
StatePublished - 2017
Event13th International Conference on Greenhouse Gas Control Technologies, GHGT 2016 - Lausanne, Switzerland
Duration: Nov 14 2016Nov 18 2016

Bibliographical note

Funding Information:
The authors acknowledge the Carbon Management Research Group (CMRG) members, including Duke Energy, Electric Power Research Institute (EPRI), Kentucky Department of Energy Development and Independence (KY-DEDI), and Louisville Gas & Electric (LG&E) and Kentucky Utilities (KU) for their financial support.

Publisher Copyright:
© 2017 The Authors.


  • CO capture
  • degradation pathways
  • ethylenediamine
  • thermal degradation

ASJC Scopus subject areas

  • Energy (all)


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