Process for continuously producing chlorine dioxide
US5380517A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 26, 1993 |
| Grant date | Jan 10, 1995 |
| Priority date | — |
| Expiry date | Feb 26, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B11/026
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for continuously producing chlorine dioxide by reacting an alkali metal chlorate, sulfuric acid or another chlorine free mineral acid and hydrogen peroxide as reducing agent to produce chlorine dioxide in an aqueous reaction medium. In the process chlorine dioxide is generated in at least one reaction step comprising at least one reaction vessel, by feeding alkali metal chlorate, acid, hydrogen peroxide and inert gas to said reaction vessel, in substantial absence of added chloride ions. The aqueous reaction medium in said reaction vessel is maintained at a pressure of from about 400 mm Hg to about 900 mm Hg and at a temperature of from about 35.degree. C. to about 100.degree. C. and at an acidity within a range from about 4 to about 14 N and the chlorate concentration of between about 0.05 moles/1 to saturation. Chlorine dioxide, oxygen and inert gas and the depleted aqueous reaction medium is withdrawn from said reaction zone without substantial crystallization of alkali metal sulfate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.