Patent ID: 8419921
Filing Date: 2013-04-16
Classification: C25B

Abstract:
1. A method for electrolytic production of fluorine or nitrogen trifluoride by the use of an electrolytic apparatus, said electrolytic apparatus comprising an electrolytic cell which is partitioned into an anode chamber and a cathode chamber by a partition wall, an anode which is disposed in said anode chamber, a cathode which is disposed in said cathode chamber, and an inert gas feeding means for feeding an inert gas to said cathode chamber, said electrolytic cell having an inlet for feeding thereto a hydrogen fluoride-containing molten salt as an electrolysis liquid or a raw material for said hydrogen fluoride-containing molten salt, said anode chamber having an anode gas outlet for withdrawing gas from said electrolytic cell, said cathode chamber having a cathode gas outlet for withdrawing gas from said electrolytic cell, said anode comprising a conductive substrate and a coating layer formed on at least a part of the surface of said conductive substrate, wherein at least a surface portion of said conductive substrate is comprised of a conductive carbonaceous material, wherein said coating layer is comprised of a conductive carbonaceous material having a diamond structure, wherein the ratio of the horizontal cross-sectional area of said cathode chamber to the horizontal cross-sectional area of said anode chamber is 2 or more, said method comprising electrolyzing, by the use of said electrolytic apparatus, a hydrogen fluoride-containing molten salt at an applied current density of from 100 to 1,000 A/dm