CO2 absorption and desorption in an aqueous solution of heavily hindered alkanolamine: Structural elucidation of CO2-containing species

Young Seop Choi, Jinkyu Im, Jun Kyo Jeong, Sung Yun Hong, Ho Gyeom Jang, Minserk Cheong, Je Seung Lee, Hoon Sik Kim

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

The pathways for the CO2 absorption and desorption in an aqueous solution of a heavily hindered alkanolamine, 2-(t-butylamino)ethanol (TBAE) were elucidated by X-ray crystallographic and 13C NMR spectroscopic analysis. In the early stage of the CO2 absorption, the formation of carbonate species ([TBAEH]2CO3) was predominant, along with the generation of small amounts of zwitterionic species. With the progress of the absorption, the carbonate species was rapidly transformed into bicarbonate species ([TBAEH]HCO3), and the amounts of the zwitterionic species increased gradually. During desorption at elevated temperature in the absence of CO2, [TBAEH]HCO3 was found to transform into [TBAEH]2CO3, where CO3 2- strongly interacts with two [TBAEH]+ via hydrogen bondings.

Original languageEnglish
Pages (from-to)4163-4170
Number of pages8
JournalEnvironmental Science and Technology
Volume48
Issue number7
DOIs
Publication statusPublished - 2014 Apr 1

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

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