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

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)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.13, no.3, 2002 , pp. 249-258 More about this Journal
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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