放射線グラフト法を用いたヨウ化水素濃縮用高分子電解質膜の開発; 耐久性に及ぼす架橋材の効果

Development of radiation grafted polymer electrolyte membrane for electro-electrodialysis of HI-I-HO mixture; Effect of chemical cross-linking on stability

田中 伸幸 ; 小貫 薫; 八巻 徹也; 越川 博; 浅野 雅春; 前川 康成

Tanaka, Nobuyuki; Onuki, Kaoru; Yamaki, Tetsuya; Koshikawa, Hiroshi; Asano, Masaharu; Maekawa, Yasunari

熱化学水素製造法ISプロセスに対する電解電気透析法(EED)の適用性評価の一環として、原子力機構が開発した放射線グラフト法を用いて作製したヨウ化水素濃縮用高分子電解質膜の高温における耐久性を検討した。通算100150時間のEED試験(ヨウ化水素酸、100C)を行い、セル電圧及びイオン交換容量の変化挙動を調べた結果、製膜に際して架橋材を用いた補強処理を行うことが耐久性の向上に有効であることがわかった。

For concentrating of HI in HI-I-HO mixture by electro-electrodialysis (EED) in the thermochemical water-splitting IS process, an application of self-made polymer electrolyte membranes fabricated by radiation-induced graft polymerization and cross-linking method has been studied. In order to bring the EED technology into practical application, stability of membrane is required in the severe environments of high temperature and strongly acidic solution. The present study examined thermal, chemical and electrochemical stability of the grafted membranes in the service environments by performing the EED operation over 100 hours at 373 K, while measuring the evolution of cell voltage and the change of ion exchange capacity. The results showed that chemical cross-linking could largely improve the membrane stability.