Method for producing fluorine
US4312718A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jun 20, 1980 |
| Grant date | Jan 26, 1982 |
| Priority date | — |
| Expiry date | Jun 20, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25B11/043
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.