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

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Phase Separation Characteristics via Bunsen Reaction in Sulfur-Iodine Thermochemical Hydrogen Production Process

SI 열화학 수소 제조 공정에서 분젠 반응을 통한 상 분리 특성

  • Lee, Kwang-Jin (Department of Fine Chemical Engineering and Chemistry, BK21-E2M, Chungnam National Univ.) ;
  • Kim, Young-Ho (Department of Fine Chemical Engineering and Chemistry, BK21-E2M, Chungnam National Univ.) ;
  • Park, Chu-Sik (Korea Institute of Energy Research) ;
  • Bae, Ki-Kwang (Korea Institute of Energy Research)
  • 이광진 (충남대학교 공과대학 정밀공업화학과, BK21-에너지환경소재사업단) ;
  • 김영호 (충남대학교 공과대학 정밀공업화학과, BK21-에너지환경소재사업단) ;
  • 박주식 (한국에너지기술연구원) ;
  • 배기광 (한국에너지기술연구원)
  • Published : 2008.10.30
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Abstract

The Sulfur-iodine(SI) thermochemical cycle is one of the most promising methods for massive hydrogen production. For the purpose of continuous operation of SI cycle, phase separation characteristics into two liquid phases ($H_2SO_4$-rich phase and $HI_x$-rich phase) were directly investigated via Bunsen reaction. The experiments for Bunsen reaction were carried out in the temperature range, from 298 to 333 K, and in the $I_2/H_2O$ molar ratio of $0.109{\sim}0.297$ under a continuous flow of $SO_2$ gas. As the results, solubility of $SO_2$, decreased with increasing the temperature, had considerable influence on the global composition in the Bunsen reaction system. The amounts of impurity in each phase(HI and $I_2$ in $H_2SO_4$-rich phase and $H_2SO_4$ in $HI_x$-rich phase) were decreased with increasing $H_2SO_4$ molar ratio and temperature. To control the amounts of impurity in $HI_x$-rich phase, temperature is a factor more important than $I_2/H2_O$ molar ratio. On the other hand, the affinity between $HI_x$ and $H_2O$ was increased with increasing $I_2/H2_O$molar ratio.

Keywords

References

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