Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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$SO_2/O_2$ Separation Process with EMIm[$EtSO_4$] in SI Cycle for the Hydrogen Production by Water Splitting

물분해 수소제조를 위한 SI cycle에서의 EMIm[$EtSO_4$]를 이용한 $SO_2/O_2$ 분리공정

  • Lee, Ki-Yong (Clean Energy Center, Korea Institute of Science and Technology) ;
  • Kim, Hong-Gon (Clean Energy Center, Korea Institute of Science and Technology) ;
  • Jung, Kwang-Deog (Clean Energy Center, Korea Institute of Science and Technology) ;
  • Kim, Chang-Soo (Clean Energy Center, Korea Institute of Science and Technology)
  • 이기용 (한국과학기술연구원 청정에너지센터) ;
  • 김홍곤 (한국과학기술연구원 청정에너지센터) ;
  • 정광덕 (한국과학기술연구원 청정에너지센터) ;
  • 김창수 (한국과학기술연구원 청정에너지센터)
  • Received : 2010.12.27
  • Accepted : 2011.02.18
  • Published : 2011.02.28
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Abstract

$SO_2$ has been absorbed and separated selectively by an ionic liquid from $SO_2/O_2$ mixture decomposed from sulfuric acid during the thermochemical SI cycle for the water splitting. In order to design and operate high pressure $SO_2/O_2$ separation system, the solubility of $SO_2$ in [EMIm]$EtSO_4$ (1-ethyl-3-methylimidazolium ethylsulfate) has been measured by Magnetic Suspension Balance at high pressure and temperature. Based on the measured solubility, a pressurized separation system was set up and operated. 194 L/h of $SO_2$($SO_2:O_2$=0.65:1) has been separated with 99.85% of $O_2$ at the vent of absorption tower, which is 22.7% of the theoretically ideal capacity of the system. This discrepancy results from the reduced contact between the gaseous $SO_2$ and the ionic liquid. Increased $SO_2$ supply, scale-up of the absorption column, and a faster ionic liquid circulation speed were suggested to improve the separation capacity.

Keywords

References

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