Safe production of chlorine dioxide in a pressurized gaseous state
US4904461A · kind A · utility
3Cited by
6References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 7, 1987 |
| Grant date | Feb 27, 1990 |
| Priority date | — |
| Expiry date | Dec 7, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B11/025
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A safe continuous process is disclosed for generating superatmospheric pressure mixtures of chlorine and chlorine dioxide, wherein the chlorine dioxide is generated in situ by chemically reducing inorganic chlorates in aqueous sulfuric acid solutions, and most of the chlorine is supplied from a high-pressure external source. The mixed gaseous products contain Cl.sub.2 and ClO.sub.2 in volumetric Cl.sub.2 /ClO.sub.2 ratios of at least 10/1, and preferably between about 11/1 and 99/1, and are ideally suited for direct use in various industrial treatments, notably in the purification and bleaching of wood pulp and the like.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.