Low temperature removal and recovery of hydrogen halides using an electrochemical membrane
US5928489A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 16, 1997 |
| Grant date | Jul 27, 1999 |
| Priority date | — |
| Expiry date | Jun 16, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25B9/19
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A low temperature method and apparatus for removing halides from relatively low temperature gas mixtures (below about 150.degree. C.) using an electrochemical cell provided with inert electrodes and an electrolyte which will provide anions compatible with the halide anions formed at the anode. The electrolyte is elected to provide inert stable cations at the temperatures encountered. The gas mixture is passed by the cathode where the halides are converted to X.sup.-. The anions migrate to the anode where they are converted to a stable gaseous form at much greater concentration levels. Current flow may be effected by utilizing an external source of electrical energy or by passing a reducing gas such as hydrogen past the anode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.