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

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
권호 표지

The Phase Separation Characteristics of Bunsen Reaction with HIx Solution in Sulfur-Iodine Hydrogen Production Process

황-요오드 수소 제조 공정에서 HIx 용액을 이용한 분젠 반응의 상 분리 특성

  • Kim, Hyo-Sub (The Department of Green Energy Technology, Chungnam National University) ;
  • Hong, Dong-Woo (Department of Fine Chemical Engineering and Applied Chemistry, Chungnam National University) ;
  • Han, Sang-Jin (Department of Fine Chemical Engineering and Applied Chemistry, Chungnam National University) ;
  • Kim, Young-Ho (Department of Fine Chemical Engineering and Applied Chemistry, Chungnam National University) ;
  • Park, Chu-Sik (Hydrogen Energy Research Group, Korea Institute of Energy Research) ;
  • Bae, Ki-Kwang (Hydrogen Energy Research Group, Korea Institute of Energy Research)
  • 김효섭 (충남대학교 녹색에너지기술학과) ;
  • 홍동우 (충남대학교 정밀응용화학과) ;
  • 한상진 (충남대학교 정밀응용화학과) ;
  • 김영호 (충남대학교 정밀응용화학과) ;
  • 박주식 (한국에너지기술연구원) ;
  • 배기광 (한국에너지기술연구원)
  • Received : 2010.11.01
  • Accepted : 2010.12.17
  • Published : 2010.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

In order to confirm the effect of $HI_x$ solution on Bunsen reaction in Sulfur-Iodine thermochemical hydrogen production process, the reaction was investigated using $HI_x$ solution as a reactant. The phase separation characteristics of reaction with $HI_x$ solution were compared with the reaction using $I_2$ and $H_2O$ as reactants. Firstly, saturation points of $I_2$ in $HI_x$ solution at various temperatures were investigated to determine reaction conditions. With increasing temperature, the amounts of unreacted $I_2$ and $H_2O$ in $HI_x$ solution were increased, while impurities (HI in $H_2SO_4$ phase and $H_2SO_4$ in $HI_x$ phase) in each phase were decreased. The volumes of $H_2SO_4$ phase obtained from Bunsen reaction with $HI_x$ solution was relatively less than those obtained from the reaction with $I_2$ and $H_2O$. The difficulty of phase separation in Bunsen reaction using $HI_x$ solution may be due to the insufficient amount of $H_2O$ existed in $HI_x$ phase after reaction. Therefore, we concluded that the supplement amount of $H_2O$ should be calculated on the basis of the moles of HI and $H_2SO_4$ and added to the reaction system for good phase separation.

Keywords

References

  1. J. E. Funk, "Thermochemical hydrogen production: past and present", Int. J. Hydrogen Energy, Vol. 26, No. 3, 2001, p. 185. https://doi.org/10.1016/S0360-3199(00)00062-8
  2. K. Onuki, H. Nakajima, I. Ioka, M. Futakawa, and S. Shimizu, "IS process for thermochemical hydrogen production", JAERI Review 94-006, 1994.
  3. S. Kasahara, G. J. Hwang, H. Nakajima, H. S. Choi, K. Onuki, and M. Nomura, "Effects of the process parameters of the IS process on total thermal efficiency to produce hydrogen from water", J. Chem. Eng. Jpn., Vol. 36, No. 7, 2003, p. 887. https://doi.org/10.1252/jcej.36.887
  4. S. Kasahara, S. Kubo, K. Onuki, and M. Nomura, "Thermal efficiency evaluation of HI synthesis/ concentration procedures in the thermochemical water splitting IS process", Int. J. Hydrogen Energy, Vol. 29, No. 6, 2004, p. 579. https://doi.org/10.1016/j.ijhydene.2003.08.005
  5. S. Goldstein, J. M. Borgard, and X. Vitart, "Upper bound and best estimate of the efficiency of the iodine sulfur cycle", Int. J. Hydrogen Energy, Vol. 30, No. 6, 2005, p. 619. https://doi.org/10.1016/j.ijhydene.2004.06.005
  6. 이광진, 안승혁, 김영호, 박주식, 배기광, "황-요오드 열화학 수소 제조 공정에서 분젠 반응과 상 분리 비교", 한국수소 및 신에너지학회 논문집, Vol. 19, No. 2, 2008, pp. 111-117.
  7. 이광진, 김영호, 박주식, 배기광, "SI 열화학수소 제조 공정에서 분젠 반응을 통한 상 분리 특성", 한국수소 및 신에너지학회 논문집, Vol. 19, No. 5, 2008, pp. 386-393.
  8. 이광진, 홍동우, 김영호, 박주식, 배기광, "황-요오드 수소 생산공정의 분젠 반응 부분에서 부반응 제어", 한국수소 및 신에너지학회 논문집, Vol. 19, No. 6, 2008, pp. 490-497.
  9. S. Kubo, S. Kasahara, H. Okuda, and A. Terada, "A pilot test plan of the thermochemical watersplitting iodine-sulfur process", Nucl. Eng. Des., Vol. 233, No. 1-3, 2004, p. 355. https://doi.org/10.1016/j.nucengdes.2004.08.018
  10. V. T. Calabrese and A. Khan, "Polyiodine and polyiodide species in an aqueous solution of iodine + KI: theoretical and experimental studies", J. Phys. Chem. A, Vol. 104, 2000, p. 1287. https://doi.org/10.1021/jp992847r
  11. M. Nomura, S. Fujiwara, K. Ikenoya, S. Kasahara, H. Nakajima, S. Kubo, G. J. Hwang, H. S. Choi, and K. Onuki, "Application of an electrochemical membrane reactor to the thermochemical water splitting IS process for hydrogen production", J. Membrane Sci., Vol. 240, 2004, p. 221. https://doi.org/10.1016/j.memsci.2004.03.046