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In order to confirm the effect of HI<sub>x</sub> solution on Bunsen reaction in Sulfur-Iodine thermochemical hydrogen production process, the reaction was investigated using HI<sub>x</sub> solution as a reactant. The phase separation characteristics of reaction with HI<sub>x</sub> solution were compared with the reaction using I₂ and H₂O as reactants. Firstly, saturation points of I₂ in HI<sub>x</sub> solution at various temperatures were investigated to determine reaction conditions. With increasing temperature, the amounts of unreacted I₂ and H₂O in HI<sub>x</sub> solution were increased, while impurities (HI in H₂SO₄ phase and H₂SO₄ in HI<sub>x</sub> phase) in each phase were decreased. The volumes of H₂SO₄ phase obtained from Bunsen reaction with HI<sub>x</sub> solution was relatively less than those obtained from the reaction with I₂ and H₂O. The difficulty of phase separation in Bunsen reaction using HI<sub>x</sub> solution may be due to the insufficient amount of H₂O existed in HI<sub>x</sub> phase after reaction. Therefore, we concluded that the supplement amount of H₂O should be calculated on the basis of the moles of HI and H₂SO₄ and added to the reaction system for good phase separation.

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