Method for removing chlorate from caustic solutions with electrolytic iron
US4276134A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 28, 1980 |
| Grant date | Jun 30, 1981 |
| Priority date | — |
| Expiry date | Jul 28, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01D1/40
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for removing chlorate from a caustic solution by the reduction of the chlorate with metallic iron. The process is particularly distinguished by the steps of contacting the caustic solution with iron to reduce the chlorate to chloride, contacting the caustic solution containing dissolved iron therein with a conductive substrate to electrolytically precipitate the iron on the substrate, thus providing a caustic solution which is substantially free from iron and chlorate ions, separating the purified portion of the caustic solution, and periodically using the iron coated substrate for treating an untreated portion of the caustic solution to reduce the chlorate to chloride, and periodically reusing the iron depleted substrate, for recovering dissolved iron from the caustic solution. The process of this invention decreases the chlorate content of caustic solutions to an acceptable level of a few ppm and also recovers dissolved iron on an iron depleted substrate for reuse and further reduction of chlorate of an untreated portion of the caustic solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.