화학공학소재연구정보센터
International Journal of Hydrogen Energy, Vol.24, No.7, 603-612, 1999
Preliminary process analysis for the closed cycle operation of the iodine-sulfur thermochemical hydrogen production process
In the iodine-sulfur thermochemical hydrogen production process, a separation characteristic of 2-liquid phase (H2SO4 phase and HIx phase) in the separator at 0 degrees C was measured. Two-phase separation began to occur at about 0.32 of I-2 molar fraction and over. The separation characteristic became better with the increase in iodine concentration in the solution. The effect of flow rate variations of HI solution and I-2 solution from the HIx distillation column on the process was evaluated. The flow rate increase in HI solution from the distillation column did not have a large effect on the flow rate of HI solution fed to the distillation column from the separator. The decreasing flow rate of I-2 solution from the distillation column decreased the flow rate of I-2 solution fed to the distillation column from the separator. The variation of I-2 molar fraction in the H2SO4 phase in the separator was sensitive to the variation in flow rate of both solutions from the distillation column. The tolerance level of the variation was investigated by considering I-2 solubility, 2-liquid phase disappearance and SO2 reaction amount.