Effect of sulfur dioxide partial pressure on the reaction of iodine, sulfur dioxide and water

Abstract

Effect of sulfur dioxide partial pressure on the reaction of iodine, sulfur dioxide and water, which is a unit reaction in the IS process for thermochemical hydrogen production, was studied experimentally at 323 K under iodine saturation. Quasi-equilibrium state was observed in the presence of sulfur dioxide gas at constant pressure. The composition of the poly-hydriodic acid solution formed was discussed assuming an ideal desulfurization by the reverse reaction of the Bunsen reaction. The value of HI/(HI+H2O) of the desulfurized solution was large at high sulfur dioxide pressure and reached the maximum of 15.7± 0.3 mol%. Copyright © 2007 The Society of Chemical Engineers.