Electrolytic process to produce sodium hypochlorite using sodium ion conductive ceramic membranes
US8268159B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 2006 |
| Grant date | Sep 18, 2012 |
| Priority date | — |
| Expiry date | Sep 28, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2209/06
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
An electrochemical process for the production of sodium hypochlorite is disclosed. The process may potentially be used to produce sodium hypochlorite from seawater or low purity un-softened or NaCl-based salt solutions. The process utilizes a sodium ion conductive ceramic membrane, such as membranes based on NASICON-type materials, in an electrolytic cell. In the process, water is reduced at a cathode to form hydroxyl ions and hydrogen gas. Chloride ions from a sodium chloride solution are oxidized in the anolyte compartment to produce chlorine gas which reacts with water to produce hypochlorous and hydrochloric acid. Sodium ions are transported from the anolyte compartment to the catholyte compartment across the sodium ion conductive ceramic membrane. Sodium hydroxide is transported from the catholyte compartment to the anolyte compartment to produce sodium hypochlorite within the anolyte compartment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.