JP2002161387A5 - - Google Patents

Description

[0006]
However, fluorine-based resins such as polytetrafluoroethylene (hereinafter sometimes referred to as Dupont 's trade name "Teflon") are not completely inert materials to fluorine gas, but are oxidized by the fluorine gas. It may be eroded and reduced in thickness, which may result in the leakage of fluorine gas to the outside of the electrolytic cell, since the sealability of the anode mounting portion is lost. Fluorine is known to react violently with many substances and is a substance that requires very careful handling. Further, fluorine gas is a very harmful substance with an allowable concentration of 1 ppm or less according to the American Society of Health, and if it leaks into the atmosphere, there is a great risk of damaging the health of workers and the like.

[0008]
As an improved example of a sealing method for preventing gas leakage, Japanese Patent Application Laid-Open No. 3-170689 discloses that corrosion resistance to chlorine generated from the anode and hypochlorous acid is large in ion exchange membrane electrolytic method of sodium chloride. It is described that long-term operation becomes possible by using fluororubber poly (vinylidene fluoride-hexafluoropropylene) as a substance and using an ethylene propylene rubber as a substance having good sealing property. However, as described above, in the fluorine electrolytic cell, even when poly (vinylidene fluoride-hexafluoropropylene) and polytetrafluoroethylene are used as the fluororubber, the erosion by the fluorine occurs frequently, and the leakage of the fluorine gas is completely completed up to this point. It could not be prevented.

Claims (9)

What is claimed is: 1. A fluorine electrolytic cell anode mounting portion characterized in that a fluorine electrolytic cell anode mounting portion supporting portion is sealed by a seal reinforcing material and a sealing material. The fluorine electrolytic cell anode attachment according to claim 1, wherein the seal reinforcing material is one or more ceramics selected from alumina, titania ceramics, silicon carbide, silicon nitride, aluminum nitride or zirconia. The fluorine electrolytic cell anode mounting portion according to claim 2 , wherein the seal reinforcing material is alumina ceramic. The fluorine electrolytic cell anode mounting portion according to claim 2 or 3, wherein the seal reinforcing material is an alumina ceramic having an alumina purity of 99% or more. The fluorine electrolytic cell anode attachment part according to any one of claims 1 to 4 , wherein the sealing material is a fluorine resin. The fluorine electrolytic cell anode attachment according to claim 5 , wherein the fluorine resin is at least one resin selected from the group consisting of polytetrafluoroethylene, polyhexafluoropropylene and poly (vinylidene fluoride-hexafluoropropylene). A fluorine electrolytic cell comprising the fluorine electrolytic cell anode attaching portion according to any one of claims 1 to 6 . What is claimed is: 1. A method of sealing a fluorine electrolytic cell anode mounting portion comprising inserting a seal reinforcing material, a sealing material and a seal into the fluorine electrolytic cell anode mounting portion. A method of producing a fluorine gas, comprising using the fluorine electrolytic cell according to claim 7 .