Process for producing sulfuric acid with low levels of niter
US9499405B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 10, 2015 |
| Grant date | Nov 22, 2016 |
| Priority date | — |
| Expiry date | Mar 12, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B17/90
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
This disclosure relates to a process for producing sulfuric acid with reduced levels of niter. The process involves (a) providing an absorption tower wherein sulfur trioxide is absorbed in a sulfuric acid feed having a first sulfuric acid solution to produce a sulfuric acid effluent having (i) a second sulfuric acid solution which has a higher concentration than the first sulfuric acid solution, (ii) a niter concentration greater than about 5 ppm (as NO3), and (iii) a temperature greater than 100° C.; and (b) contacting a first purifying agent comprising sulfamic acid and a second purifying agent comprising hydrogen peroxide with the sulfuric acid effluent to form a treated sulfuric acid effluent, the treated sulfuric acid effluent being maintained at a temperature of greater than 100° C. for a maintenance period of at least about 1 minute.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.