Method for distributing an aqueous solution containing a peroxygen in clay
US4747728A · kind A · utility
3Cited by
15References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 25, 1986 |
| Grant date | May 31, 1988 |
| Priority date | — |
| Expiry date | Aug 25, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention is a method for distributing a colloid-free, aqueous solution containing a peroxygen compound in a particulate matter containing clay without causing the clay to swell. It has been found that hydrogen peroxide alone causes swelling of clays. It is well-known that monovalent ions cause clays to disperse and swell. It is unexpected to find that perborate and persulfate anions do not cause clays to swell, even in the presence of sodium ions. The process is useful for enhancing the biodegradation of contaminants in clayey soils or for winning mineral values from clayey ore deposits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.