抄録
Merits of open-cycle thermochemical processes are characterized -as compared with closed-cycle thermochemi-cal processes to make water-splitting- by unnecessity of high-temperature equipments, acceptable low thermal efficiency than water electrolysis to produce hydrogen, and conversions of unwanted materials into valuable ma-terials. This study focuses a open cycle process to produce hydrogen and sulfuric acid from water and sulfur dioxide which is obtained from sulfur of general industry wastes. Improvement of hydrogen iodide decomposition rate by absorptions of reactant of iodine into active carbon was adapted to measure thermal burden on hydrogen production section and to utilize low temperature waste heat ranged 200-400℃. A heat requirement to drive a hydrogen production reactor with active carbon was estimated to be 194 kJ/mol-H_2, thereby heat input of total process was reduced from 6380 without active carbon to 1480 kJ/mol-H_2 with that.
