Process for scrubbing ammonia from acid gases comprising ammonia and hydrogen sulfide
US7258848B1 · kind B1 · utility
22Cited by
5References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 31, 2006 |
| Grant date | Aug 21, 2007 |
| Priority date | — |
| Expiry date | Jul 31, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02A50/20
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention provides a process for removing ammonia as an aqueous salt solution from an acid gas comprising ammonia and hydrogen sulfide. A strong acid, such as sulfuric acid, is used as a scrubbing agent to convert ammonia to an ammonium salt. Control of pH and stripping in combination with reboiler or evaporators reduces hydrogen sulfide concentration. The ammonium salt is produced as an aqueous solution, which may crystallized to form a solid product. The ammonium salt solution or solid may be used as a fertilizer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.