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Report No.

Effect of temperature on electro-electrodialysis of HI-I$$_{2}$$-H$$_{2}$$O mixture using ion exchange membranes

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

In the thermochemical water-splitting iodine-sulfur process for hydrogen production, an electro-electrodialysis was applied to increase the HI molality of a HI-I$$_{2}$$-H$$_{2}$$O mixture. In order to investigate the temperature dependence of the membrane performance for increasing the HI concentration, a theoretical formula for the performance indexes (proton transport number, initial cell voltage, and ratio of water permeation to proton permeation in the membrane) was derived on the basis of the Nernst-Planck equation and electrophoresis theory. The obtained formula could reproduce the experimental values of the grafted membranes and Nafion 212 in the temperature range 313-373 K and was validated.



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Category:Engineering, Chemical



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