Process for treating coal to reduce sulfur content in flue gases produced by coal combustion
US4702899A · kind A · utility
8Cited by
16References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 25, 1986 |
| Grant date | Oct 27, 1987 |
| Priority date | — |
| Expiry date | Jul 25, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D53/501
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for reducing the sulfur oxide content of flue gases produced by combustion of sulfur-containing coal containing cations of alkali metals, alkaline earth metals or both, in ion exchangeable form. Flue gases containing sulfur oxides are recycled to contact coal awaiting combustion. Sulfur oxides are absorbed on the coal during the contact step, which is conducted in the presence of water. Sulfur oxides react with alkali and alkaline earth metal cations, and are oxidized to form sulfate reaction products. When the treated coal is burned, these sulfate reaction products are retained in the coal ash.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.