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Simulation study about the effect of pressure on purification of H$$_{2}$$SO$$_{4}$$ and HIx phases in the iodine-sulfur hydrogen production cycle

熱化学水素製造法ISプロセスにおけるH$$_{2}$$SO$$_{4}$$相及びHIx相の精製における圧力効果のシミュレーション

Wang, L.*; 今井 良行  ; 田中 伸幸 ; 笠原 清司  ; 久保 真治  ; 小貫 薫; Chen, S.*; Zhang, P.*; Xu, J.*

Wang, L.*; Imai, Yoshiyuki; Tanaka, Nobuyuki; Kasahara, Seiji; Kubo, Shinji; Onuki, Kaoru; Chen, S.*; Zhang, P.*; Xu, J.*

熱化学水素製造法ISプロセスの工業化に向けた課題の一つに、ブンゼン反応で生成する2種の溶液(H$$_{2}$$SO$$_{4}$$相とHIx相)に含まれる不純物(H$$_{2}$$SO$$_{4}$$相中のHI, HIx相中のH$$_{2}$$SO$$_{4}$$)を除去する精製操作の最適化がある。その検討に役立てるため、Mixed Solvent Electrolyte Modelに基づく熱力学データベースを備えた化学プロセスシミュレーターESPを用いて、H$$_{2}$$SO$$_{4}$$相及びHIx相の精製における圧力効果のシミュレーションを行った。H$$_{2}$$SO$$_{4}$$相について、絶対圧0.2$$sim$$6barの範囲において、反応平衡及び相平衡を検討した結果、大気圧以下の低圧条件下で、気液分離による不純物の除去、精製操作に伴う副反応の抑制のいずれについても効果的に実施できる可能性があることを見いだした。一方、HIx相では、平衡論的に有利な圧力条件は認められなかった。

Optimization of purification operation of the Bunsen reaction products, H$$_{2}$$SO$$_{4}$$ phase and HIx phase, is one of the problems for industrialization of the thermochemical hydrogen production iodine-sulfur process. HI impurity is contained in H$$_{2}$$SO$$_{4}$$ phase, and H$$_{2}$$SO$$_{4}$$ impurity is in HIx phase: these impurities should be removed by purification. Effect of pressure on purification of these phases was simulated as an investigation of the operation by a chemical process simulator ESP with a thermodynamic database based on the Mixed Solvent Electrolyte model. The simulation was of the reaction equilibrium and phase equilibrium. As the result of the simulation in the range of 0.2-6 bar, effective removal of impurities and suppression of undesirable side reactions were suggested in the purification of H$$_{2}$$SO$$_{4}$$ phase at below atmospheric pressure. On the other hand, advantageous pressure in the viewpoint of equilibrium was not found in purification of HIx phase.

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パーセンタイル:30.1

分野:Chemistry, Physical

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