Fluorinated ion exchange membrane as diaphragm for electrolysis.
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概要
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The reaction of a monomeric perfluoroalkanesulfonyl chloride with reducing agents provides a carboxylic acid in lower yields under the appropriate conditions, whereas in a perfluoro polymer with chlorosulfonyl group, the sulfonyl chloride is desulfurized to form a carboxylic acid in extraordinarily high yields. Ion-exchange capacity of a polymer does hardly change before and after the reaction, so a loss of ion exchange group does not occur throughout the reaction. Infrared spectra of films treated with various reducing agents suggest that this reaction is two-step reaction, and that carboxyl group is formed via sulfino group. It is supposed that high selectivity and conversion are due to difference of the circumstances around reactive sites in polymer from those in monomer.<BR>This reaction can be applied for the preparation of the double layer membrane having both carboxyl sulfo groups for salt electrolysis with high current efficiency and low membrane voltage.<BR>Membranes with various thickness of carboxylic acid layers are obtained by treating one side of the membrane containing chlorosulfonyl group with reducing agent. Performances of those membranes show that current efficiency, membrane voltage and water transprot depend on the thickness of carboxylic acid layer. The thicker the carboxylic acid layer, the higher the current efficiency and membrane voltage and the lower the water transport. The thickness of at least 7 microns of carboxylic acid layer is needed to get a good performance.
- 公益社団法人 日本化学会の論文
公益社団法人 日本化学会 | 論文
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