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

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Effect of Catholyte to Anolyte Amount Ratio on the Electrodialysis Cell Performance for HI Concentration

Anolyte와 Catholyte의 비율에 따른 HI 농축 전기투석 셀의 성능변화

  • Kim, Chang-Hee (Hydrogen Energy Research Center, Korea Institute of Energy Research) ;
  • Cho, Won-Chul (Hydrogen Energy Research Center, Korea Institute of Energy Research) ;
  • Kang, Kyoung-Soo (Hydrogen Energy Research Center, Korea Institute of Energy Research) ;
  • Park, Chu-Sik (Hydrogen Energy Research Center, Korea Institute of Energy Research) ;
  • Bae, Ki-Kwang (Hydrogen Energy Research Center, Korea Institute of Energy Research)
  • 김창희 (한국에너지기술연구원 수소에너지연구센터) ;
  • 조원철 (한국에너지기술연구원 수소에너지연구센터) ;
  • 강경수 (한국에너지기술연구원 수소에너지연구센터) ;
  • 박주식 (한국에너지기술연구원 수소에너지연구센터) ;
  • 배기광 (한국에너지기술연구원 수소에너지연구센터)
  • Received : 2010.11.22
  • Accepted : 2010.12.17
  • Published : 2010.12.31
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Abstract

The effect of catholyte to anolyte amount ratio on the electrodialysis cell performance for HI concentration was investigated. For this purpose, the electrodialysis cell was assembled with Nafion 117 as PEM membrane and activated carbon fiber cloth as electrodes. The initial amount of catholyte was 310 g and that of anolyte varied from 1 to 3 of amount ratio. The calculated electro motive force (EMF) increased with time and the increment enhanced as the amount ratio of catholyte to anolyte decreased. The mole ratios of HI to $H_2O$ (HI molarity) in catholyte were almost the same and exceeded pseudo-azeotropic composition for all amount ratios after 2 h operation. The HI molarity continuously increased with time for 10 h operation. The mole ratio of $I_2$ to HI decreased in catholyte but increased in anolyte. The increment of mole ratio of $I_2$ to HI in anolyte rose as the amount ratio of catholyte to anolyte decreased. In case of 1:1 amount ratio, the cell operation was stopped for the safety at approximately 6 h operation, since the mole ratio of $I_2$ to HI reached solubility limit. The cell voltage of the electrodialysis cell increased with time and the rate of increase was high at low amount ratio. This suggests that the amount ratio of catholyte to anolyte not only crucially influences the cell voltage, but also cell operation condition.

Keywords

References

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