抄録
The IS process is one of water splitting methods to produce hydrogen using I2 and SO2 as catalysts. Three kinds of membrane techniques (Hydrogen permselective membrane reactor for HI decomposition reaction (HPMR), Electro-electrodialysis for concentration of HI (EED), Electrochemical cell for the reaction of SO2, I2 and H2O (EC))were investigated by viewpoints of the total thermal efficiency. The HI concentration procedure by EED was the best method to improve thermal efficiency. The maximum thermal efficiency was 40.8 % at 12.5 mol kg-H2O-1 of HI concentration after EED. Thermal efficiency for the EC was slightly lower than that for EED by using the electrochemical data we had obtained. However, this method has a potential for the simple process operation compared with EED. In order to obtain higher thermal efficiency by featuring the EC, about 30 % of the required electric energy demand should be reduced. Total thermal efficiency can be improved only by 1 % for HPMR, and this technique should be applied to help material stabilities after HI decomposition reaction.
