Use of ionic liquids as absorbents to separate so2 in so 2/O2 in thermochemical processes to produce hydrogen

Ki Yong Lee, Gyeong Taek Gong, Kwang Ho Song, Honggon Kim, Kwang Deog Jimg, Chang Soo Kim

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)


In the thermochemical cycles such as the SI (sulfur-iodine) cycle, the Westinghouse process, and Ispra Mark 13 process, SO2 needs to be separated and purified to enhance system efficiency. As novel absorbents with non-volatility, thermal stability and high SO2 absorption capability, the characteristics of ionic liquids (ILs) as SO2 absorbents were investigated to separate SO2 in SO2/O2 gaseous mixtures from the sulfuric acid decomposer. SO2 absorption and desorption experiments showed that SO2 solubility and absorption rate in ILs were influenced mainly by anions of ILs. [BMIm][Cl] and [BMIm][OAc] (1.40-1.69 SO2 gmol/ILs gmol) showed the highest SO2 solubility among the tested ILs at 50°C and 0.67 atm Pso2. Interestingly, [BMIm][OAc] showed irreversibility in the cycle of absorption and desorption. [BMIm][MeSO4] showed moderate SO2 solubility and good reversible cycles of absorption and desorption. The dependency of temperature and pressure on SO2 solubility of [BMIm][MeSO 4] was scrutinized.

Original languageEnglish
Pages (from-to)6031-6036
Number of pages6
JournalInternational Journal of Hydrogen Energy
Issue number21
Publication statusPublished - 2008 Nov


  • Cycle
  • Ionic liquid
  • Sulfur dioxide absorbent
  • Sulfur dioxide separation
  • Thermochemical water splitting

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology


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