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The feasibility of the Bunsen reaction using an ionic liquid (IL) containing iodide ions as the solvent was experimentally examined to improve the thermal e‹ciency of a thermochemical water-splitting iodinesulfur (IS) process for hydrogen production using a high-temperature gas-cooled reactor (HTGR) by increasing the hydrogen iodide (HI) concentration in the Bunsen reaction. The solubility of the reactants of the Bunsen reaction, iodine (I2) and sulfur dioxide (SO2), in the IL was measured to conˆrm the feasibility of the reaction. 1Butyl3methylimidazolium iodide ([bimi][I]) showed an I2 solubility of 4.78 mol/mol at room temperature, which was 2.47 times higher than that in hydriodic acid. [bimi][I] also showed a high SO2 solubility of 3.42 mol/mol, which was 125 times higher than that in water. The feasibility of the Bunsen reaction using the IL was conˆrmed in terms of the increases in I2 and SO2 concentrations in the Bunsen reaction. The HI concentration in the hydriodic acid in the Bunsen reaction using [bimi][I] was preliminary examined at room temperature, ambient pressure, and reactant composition of ILI2SO2H2O=0.25 0.50.512.11.01.0 (molar ratio). The maximum HI concentration was 24.5 mol (=69.8 wt), which was higher than that obtained by the conventional Bunsen reaction.

Experimental Study on the Bunsen Reaction Using an Ionic Liquid in Thermochemical Iodine-Sulfur Process for Hydrogen Production