Method to control mercury emissions from exhaust gases
US6136281A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 31, 1999 |
| Grant date | Oct 24, 2000 |
| Priority date | — |
| Expiry date | Mar 31, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D53/8665
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention relates to a method to catalyze the oxidation of Hg(0) in a flue gas stream prior to standard emissions control equipment. The oxidized mercury has been found to be more condensable than Hg(0) and consequently more easily removed from the gas phase. Accordingly, mercury in its oxidized form can be trapped from a flue gas stream or the like by absorption onto a solid mass or can be more efficiently removed from flue gas streams by wet processes such as a two-stage wet FGD. The gist underlying the inventive concept of the instant invention relates to the use of a porous bed of gold-coated material that is saturated with Hg(0) to the point that the gold in the presence of HCl in the exhaust stream catalyses the oxidation of Hg(0).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.