Stability of radiation grafted membranes in electro-electrodialysis of HIx solution

放射線グラフト法を用いた高分子電解質膜のヨウ化水素酸中における高温安定性

田中 伸幸 ; 八巻 徹也; 浅野 雅春; 前川 康成; 小貫 薫; 日野 竜太郎

Tanaka, Nobuyuki; Yamaki, Tetsuya; Asano, Masaharu; Maekawa, Yasunari; Onuki, Kaoru; Hino, Ryutaro

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高分子電解質膜の高温安定性を検討した。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、製膜に際して架橋処理を行うことが高温安定性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.