Use of ionic liquids as absorbents to separate SO2 in SO2/O-2 in thermochemical processes to produce hydrogen
- Authors
- Lee, Ki Yong; Gong, Gyeong Taek; Son, Kwang Ho; Kim, Honygon; Jung, Kwany-Deog; Kim, Chang Soo
- Issue Date
- 11월-2008
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Sulfur dioxide absorbent; Sulfur dioxide separation; Ionic liquid; Thermochemical water splitting cycle
- Citation
- INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v.33, no.21, pp.6031 - 6036
- Indexed
- SCIE
SCOPUS
- Journal Title
- INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
- Volume
- 33
- Number
- 21
- Start Page
- 6031
- End Page
- 6036
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/122464
- DOI
- 10.1016/j.ijhydene.2008.08.002
- ISSN
- 0360-3199
- Abstract
- 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/O-2 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/lLs gmol) showed the highest SO2 solubility among the tested ILs at 50 degrees C and 0.67 atm P-SO2. 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][MeSO4] was scrutinized. (C) 2008 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.
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