Phase separation characteristics of pressurized Bunsen reaction for Sulfur-Iodine thermochemical hydrogen production process

摘要

The Sulfur-Iodine (SI) thermochemical hydrogen production process is promising method for the massive production of hydrogen using the high temperature thermal energy of VHTR. For continuous operation of SI process, the conditions of Bunsen reaction are considered as the pressurized conditions with ca. 373～393K temperature and the composition of Bunsen products should be kept constant during the reaction. Therefore, we carried out the continuous Bunsen reaction using a counter-current flow reactor at pressurized condition to investigate the phase separation characteristics of pressurized Bunsen reaction. As the results, the composition of Bunsen product was maintained constantly as the evidence for the steady-state operation. The continuous reaction was operated without Occurrence of side reactions, and a H_2SO_4 phase and HI_x phase as the product contains a small amount of impurities (HI in a H_2SO_4 phase and H_2SO_4 in a HI_x phase). We concluded that the pressurized Bunsen reaction is favorable to the continuous operation of SI process than the atmospheric reaction.