臭素酸塩電解製造に関する基礎的研究(1)
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The authors studied on distribution of pH, BrO^-, BrO_2^-, and BrO_3^- in a bromate cell, using specially-designed electrolytic cell. The distance between the anode and the cathode was chosen very great in order to make it easy to measure the distribution of pH and the products. Using this cell, we can separate the electrolysis and can measure pH and analyse the components in each section of the cell quantitatively. The distributions of pH and their changes during electrolysis are shown in Fig. 2. The overall mean pH of the electrolytic solution rises with increasing amount of current passed. But in each part of the cell, pH near the anode, decreases and on the other hand, pH near the cathode, increases with increasing amount of current passed. At the central part between the anode and the cathode, pH of the solution gradually increases during electrolysis. From experimental results, it is considered that BrO_3^- is formed by the chemical reaction [chemical formula] and it is not formed by the direct electrochemical reaction. Finally, hydrobromic acid is added into the electrolytic cell during electrolysis in order to maintain the optimum pH of the solution. The hydrobromic acid is added near the anode was not effective to the control of pH in the cell. By this addition the amount of escaping bromine gas is apt to increase and the consumption of hydrobromic acid increases. Consequently the current efficiency of the producing BrO_3^- decreases. On the contrary, as near the cathode, pH is high, the efficiency of the addition of hydrobromic acid was rised and the consumption of the hydrobromic acid decreased.
- 岡山理科大学の論文
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