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THE preparation of fluorine before the war was limited to small quantities on a laboratory scale and, in general, centered around the electrolysis of potassium fluoride-hydrogen fluoride solutions under three different sets of conditions: (a) an electrolyte with a mole ratio of KF.8-10 HF at room tem-A CELL for the electrolytic manufacture of elemental fluorine, using carbon anodes in an electrolyte containing potassium fluoride and hydrogen fluoride in a mole ratio of 1 to 2, has been developed and satisfactorily operated on a large scale. In large scale operation the cells are placed in separate compartments in groups of three, all emptying to a common header and connected electrically in series. Some of the units have been operated for more than 5,000,000 ampere-hours, producing in that time nearly 7000 pounds of fluorine with evidence that longer lives can be expected.

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When the product was treated with 14 moles of AgF¡> at 200°C.