Claus plant preprocessing systems and methods for removal of ammonia from claus plant feed gases
US9181095B2 · kind B2 · utility
0Cited by
6References
20Claims
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Key dates
| Filing date | Jul 11, 2014 |
| Grant date | Nov 10, 2015 |
| Priority date | — |
| Expiry date | Jul 11, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B25/28
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Systems and methods for pre-treatment of acid gas are presented in which ammonium is removed from the acid gas in an absorber that is operated at significantly elevated temperature using dilute phosphoric acid. While seemingly incompatible, absorbing ammonia at high heat in the absorber will allow for production of a diammonium phosphate product that is ultra-low in residual sulfurous compounds and prevent crystallization of phosphate salts due to the increased solubility of the salts in the hot diluted solvent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.