Preparation of Ion-Exchange Spacer for Lowering Electrical Resistance of Electrodialyzer by Radiation-Induced Graft Polymerization

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  • 電気透析槽の電気抵抗の低減をめざした放射線グラフト重合法によるイオン交換スペーサーの作製
  • デンキ トウセキソウ ノ デンキ テイコウ ノ テイゲン オ メザシタ ホウシャセン グラフト ジュウゴウホウ ニ ヨル イオン コウカン スペーサー ノ サクセイ

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Abstract

In a conventional desalination process, with the progression of desalination, i.e., decreasing the concentration of ions, the electrical resistance of the electrodialyzer increases. Here, ion-exchange groups were appended onto the currently-used spacer of the electrodialyzer to enhance ion transport and reduce the electrical resistance of the electrodialyzer. By means of radiation-induced graft polymerization, glycidyl methacrylate was graft-polymerized onto a polyolefin-made spacer with a thickness of 0.8 mm and an aperture ratio of 72 ％, and the produced epoxy group was converted into a sulfonic acid group. The electrical resistance of the sulfonic-acid type ion-exchange spacer with a salt-splitting capacity of 1.4 mmol/g was reduced in the 1.0 mmol/LNaCl concentration by 41 ％ compared to that of the starting spacer.

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