Improvement of the Thermochemical water-splitting IS Process Using the Membrane Technology

분리막 기술을 이용한 열화학적 수소제조 IS[요오드-황] 프로세스의 개선

  • Hwang, Gab-Jin (Hydrogen Energy Research Center, Korea Institute of Energy Research) ;
  • Kim, Jong-Won (Hydrogen Energy Research Center, Korea Institute of Energy Research) ;
  • Sim, Kyu-Sung (Hydrogen Energy Research Center, Korea Institute of Energy Research)
  • 황갑진 (한국에너지기술연구원 수소에너지연구센터) ;
  • 김종원 (한국에너지기술연구원 수소에너지연구센터) ;
  • 심규성 (한국에너지기술연구원 수소에너지연구센터)
  • Published : 2002.09.15

Abstract

Thermochemical water-splitting IS(Iodine-Sulfur) process has been investigating for large-scale hydrogen production. For the construction of an efficient process scheme, two kinds of membrane technologies are under investigating to improve the hydrogen producing HI decomposition step. One is a concentration of HI in quasi-azeotropic HIx ($HI-H_2O-I_2$) solution by elecro-electrodialysis. It was confirmed that HI concentrated from the $HI-H_2O-I_2$ solution with a molar ratio of 1:5:1 at $80^{\circ}C$. The other is a membrane reactor to enhance the one-pass conversion of thermal decomposition reaction of gaseous hydrogen iodide (HI). It was found from the simulation study that the conversion of over 0.9 would be attainable using the membrane reactor using the gas permeation properties of the prepared silica hydrogen permselective membrane by chemical vapor deposition (CVD). Design criterion of the membrane reactor was also discussed.

Keywords

Hydrogen production;Membrane;Water-splitting;Hydrogen separation;Electrodialysis

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