Progress report on the thermochemical hydrogen production by the Mg-S-I cycle-laboratory-scale demonstration

Continuous flow system demonstration and evaluation of thermal efficiency for the magnesium-sulfur-iodine thermochemical water-splitting cycle

“…During the first part of the study (1978)(1979)(1980)(1981)(1982)(1983), emphasis was placed on the process in which Mgl2 and MgS04 were not separated (Mizuta et al, 1978;Kumagai, 1979a, 1982a,b), where HI (H2 evolving substance) and S03 (02 evolving one) were separated by the difference in decomposition temperatures of Mgl2 and MgS04. After fundamental studies of each cycle reaction (Kumagai et al, ,1984a, batch system demonstration of the whole 0888-5885/90/ 2629-0565$02.50/ 0 cycle Mizuta, 1983,1985; Mizuta and Kumagai, 1984Kumagai, ,1985 was successfully performed by repeating the cycle operations 38 times, where solid reactants remained stationary and HI and S03 gases were separately evolved at different stages by the temperature swing of reactants and apparatus. With this successful batch system demonstration, each of the constituent reactions was confirmed and the feasibility of the cycle was proved.…”