Two-stage removal of sulfur dioxide from process gas using treated oil shale
US4140181A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 9, 1977 |
| Grant date | Feb 20, 1979 |
| Priority date | — |
| Expiry date | Dec 9, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S208/951
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Sulfur dioxide is removed from a process gas by passing the process gas through a first fragmented permeable mass of particles containing treated oil shale and including alkaline earth metal oxides at a sufficient temperature to remove sulfur dioxide from the process gas. Gas containing sulfur dioxide from the first fragmented mass is passed through a second fragmented permeable mass of particles containing treated oil shale and including alkaline earth metal oxides. Water in the second fragmented mass combines with alkaline earth metal oxides in the second fragmented mass and sulfur dioxide in the gas from the first fragmented mass with resultant removal of sulfur dioxide from gas from the first fragmented mass.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.