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AssigneesNobuatsu Watanabe, Central Glass Company, Limited, Toyo Tanso Co., Ltd.
InventorsNobuatsu Watanabe, Minoru Aramaki, Yasushi Kita
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The use of an isotropic carbon block having an anisotropy of not more than 1.2 in terms of an anisotropic ratio of specific resistance as an anode in the production of fluorine by the electrolysis of an electrolyte comprising a mixed molten salt system of potassium fluoride and hydrogen fluoride has been found to be extremely useful for attaining increase in critical current density so that occurrence of the unfavorable anode effect can be effectively prevented. With such an isotropic carbon block anode, even if the anode effect occurs, the electrolysis can be stably continued again by lowering the potential of the electrode. Further, the incorporation of a fluoride into the isotropic carbon block anode and/or the addition of a fluoride into the electrolyte is effective for further increasing critical current density.
A method for producing fluorine comprising electrolyzing an electrolyte comprising a mixed molten salt system of potassium fluoride and hydrogen fluoride in an electrolytic cell having as an anode a carbon block, characterized in that the electrolysis of the electrolyte is conducted using as the anode a carbon block having an anisotropy of not more than 1.2 in terms of an anisotropoic ratio of specific resistance.
Dependencies are inferred from the claim text.