Method for decoloring sulphuric acid deriving from acid production processes
US5026535A · kind A · utility
11Cited by
5References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 18, 1989 |
| Grant date | Jun 25, 1991 |
| Priority date | — |
| Expiry date | Oct 18, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B17/905
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention relates to a method for decoloring sulphuric acid produced in accordance with the contact method, comprising one or more absorption circuits. The produced sulphuric acid is decolored by adding hydrogen peroxide to the system. The method is characterized by adding the hydrogen peroxide to the sulphuric acid in the final absorption circuit, and by maintaining the temperature in this circuit above about 70.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.