THERMODYNAMIC CONSIDERATIONS ON THE PURIFICATION OF H2SO4 AND HIX PHASES IN THE IODINE-SULFUR HYDROGEN PRODUCTION PROCESS |
| |
| Authors: | Laijun Wang Yoshiyuki Imai Nobuyuki Tanaka Shinji Kubo Kaoru Onuki |
| |
| Affiliation: | 1. Institute of Nuclear and New Energy Technology , Tsinghua University , Beijing , China;2. Nuclear Hydrogen and Heat Application Research Center, Japan Atomic Energy Agency , Ibaraki , Japan |
| |
| Abstract: | The reaction equilibrium and phase equilibrium in H2SO4 and HIx phases produced by the Bunsen reaction of the iodine-sulfur thermochemical hydrogen production process were examined using a chemical process simulator, ESP, with a thermodynamic database based on the mixed solvent electrolyte model. At temperatures lower than ca. 110°C, the reaction of HI and H2SO4 produced elemental sulfur in both phases. At higher temperatures, the reverse Bunsen reaction occurred, and SO2 was produced in the H2SO4 phase. In the HIx phase, conversely, SO2 formation predominated in a narrow temperature range and H2S was produced with the increase in temperature. The presence of N2 gas lowered the temperature of the predominant reaction change. A feed of O2 for purification was proposed to suppress the consumption of objective components in the H2SO4 phase purification, and an O2 feed to the HIx phase for the suppression of H2S and S impurities was proposed by the simulation. |
| |
| Keywords: | H2SO4 phase HIx phase IS process Purification Thermochemical hydrogen production Thermodynamic consideration |
|
|
