1. Process

1.1 Principle

Fluorine is prepared by electrolysis of anhydrous hydrogen fluoride, made conductive by the addition of a metal fluoride. Industrial producers use molten salt with a composition close to KF, 2 HF at a temperature of between 85 and 105 ˚C.

In this medium, hydrogen fluoride decomposes at a minimum potential of 2.9 V according to the reaction : $2 HF (l) \to H_{2} (g) + F_{2} (g)$

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References

(1) - LATIMER (W.) - The potential of the fluorine electrodes from thermal data - . J. Am. Chem. Soc. 48 p. 2868-9 (1926).
(2) - DEVILLIERS (D.), LANTELME (F.), CHEMLA (M.) - Étude de la tension de décomposition de HF sur électrode de carbone dans un bain 2 HF, KF...

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