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http://dx.doi.org/10.7316/khnes.2011.22.1.013

$SO_2/O_2$ Separation Process with EMIm[$EtSO_4$] in SI Cycle for the Hydrogen Production by Water Splitting  

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)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.22, no.1, 2011 , pp. 13-20 More about this Journal
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
$SO_2/O_2$ separation; [EMIm]$EtSO_4$; Magnetic suspension balance; Pressure/temperature swing absorption; SI cycle;
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Times Cited By KSCI : 2  (Citation Analysis)
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