Regeneration of nitrous acid by oxidation with direct application of heated nitric acid
US4925643A · kind A · utility
14Cited by
22References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 23, 1989 |
| Grant date | May 15, 1990 |
| Priority date | — |
| Expiry date | Jan 23, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2305/026
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A method for regenerating an aqueous liquid comprising nitrous acid and/or oxides of nitrogen is characterized by feeding the liquid to a column such that the liquid descends through the column. An aqueous solution comprising nitric acid is heated to its boiling point such that the heated nitric acid refluxes into the packed column. An oxygen-containing gas is passed into the liquid, whereby the liquid is converted substantially to nitric acid as it descends in the column.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.