| 摘要 |
PURPOSE:To produce a Ce(NO3)4 soln. having comparatively high concn. at high current efficiency, by using a nitric acid soln. contg. Ce(NO3)3 as an anolyte and an electrolyte uncontaining NO3<-> as a catholyte and a cation exchange membrane as a diaphragm, and performing electrolytic oxidation. CONSTITUTION:In the case of obtaining a soln. contg. Ce(NO3)4 by subjecting the soln. contg. Ce(NO3)3 to electrolytic oxidation, a nitric acid soln. contg. Ce(NO3)3 is used as an anolyte. On the other hand, an electrolyte such as sulfuric acid uncontaining NO3<-> is used as a catholyte and thereby formation and accumulation of NH4<+> resulting from reduction are prevented. Further a cation exchange membrane is used as a diaphragm and diffusion of a ion is prevented. As this exchange membrane, a fluorine-base ion exchange membrane good in durability is more preferable. Furthermore as an electrode, an anode such as titanium coated with iridium oxide and a cathode such as stainless steel are used and electrolysis is performed at about 1-70A/dm<2> current density at the temp. not more than about 150 deg.C. Thereby the nitric acid soln. of Ce(NO3)4 uncontaining NH4<-> is obtained with high efficiency.
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