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Electro-electrodialysis of HI-I$$_{2}$$-H$$_{2}$$O mixture using radiation-grafted polymer electrolyte membranes

放射線グラフト法による高分子電解質膜を用いたHI-I$$_{2}$$-H$$_{2}$$O溶液の電解電気透析

田中 伸幸 ; 八巻 徹也; 浅野 雅春; 前川 康成; 小貫 薫

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

熱化学水素製造法ISプロセスにおけるHI-I$$_{2}$$-H$$_{2}$$O(HIx)溶液の濃縮操作に対する新規な高分子電解質膜の適用性を評価した。電解質膜はエチレン-テトラフルオロエチレン共重合体(ETFE)を基材として、イオン交換容量(IEC)が1.1-1.6mmol/gになるようにスチレンを放射線グラフト重合して作製した。40$$^{circ}$$CにおけるHI濃縮試験を行い、電解質膜の主要な性能指標である輸率,プロトンに対する水の透過量,電流効率及び電気抵抗のIEC依存性を調べた。その結果、従来のNafionと比較して、本報で使用した電解質膜はイオン選択性が劣るものの電気抵抗が低く、HIx溶液の濃縮操作に必要な消費電力を最大で32%削減できることがわかった。

In the thermochemical water-splitting Iodine-Sulfur process used to produce hydrogen new polymer electrolyte membranes were applied in an electro-membrane process (Electro-electrodialysis, EED) to increase the HI molality of HIx solution (HI-I$$_{2}$$-H$$_{2}$$O mixture) to be over quasi-azeotropic. Radiation grafting of a styrene monomer into a poly (ethylene-$$co$$-tetrafluoroethylene) base film and subsequent sulfonation provided electrolyte membranes that had ion exchange capacities (IECs) of 1.1-1.6 mmol/g. With the EED of the HIx solutions using [HI]=[I$$_{2}$$]=10 mol/kg at 40 $$^{circ}$$C the transport number of protons, ratio of permeated quantities of water to the protons, and current efficiency all appeared to depend on the IEC of the resulting membranes. When compared to Nafion the tested membranes exhibited lower electric cell resistance, and thereby decreasing the overall energy required in the concentration operation.

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パーセンタイル:59.44

分野:Engineering, Chemical

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