Compositions and methods for storing aqueous chlorine dioxide solutions
US6284152A · kind A · utility
Inventor
Key dates
| Filing date | Apr 28, 1999 |
| Grant date | Sep 4, 2001 |
| Priority date | — |
| Expiry date | Apr 28, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B11/022
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The present invention is directed to both physical and chemical means for maintaining continuous high levels of chlorine dioxide in aqueous solutions for extended periods, with minimum loss through degradation in the solution and dissipation through the walls of the containing vessel within which the solution is stored. The ClO.sub.2 may be maintained even in the absence of very high levels of chlorite, from which supplemental, offsetting levels of ClO.sub.2 may be generated. The present invention relates to the discovery that certain types of plastic and glass containers have the ability to maintain relatively constant levels of ClO.sub.2 in their contained solutions over extended periods, particularly in aqueous compositions comprising chlorite/ClO.sub.2 ratios sufficient for a stabilizing complex of the two, presumably Cl.sub.2 0.sub.4.sup.--, to suppress the ClO.sub.2 loss. Of particular value is certain high-density polyethylene terephthalate (PETE) plastic bottling and plastic containers which have been initially exposed to a fluorinating environment. Specifically, in the latter regard, it has been discovered that certain plastic containers which ordinarily are incapable of m…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.