Reduction of nitrogen-based pollutants through the use of urea solutions containing oxygenated hydrocarbon solvents
US4719092A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 4, 1985 |
| Grant date | Jan 12, 1988 |
| Priority date | — |
| Expiry date | Oct 4, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D53/56
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Disclosed is a process for maintaining low effluent ammonia contents while reducing nitrogen oxides in an effluent from the combustion of a carbonaceous fuel under oxygen-rich conditions which minimize the production of carbon-based pollutants. An aqueous solution of urea and an oxygenated hydrocarbon is injected into an effluent at a temperature above 1600.degree. F., and preferably above 2000.degree. F. The oxygenated hydrocarbon will be employed at a level effective to reduce the levels of free ammonia in the effluent. This is important when burning fuels containing significant sulfur contents because the free ammonia tends to react with the sulfur compounds to produce solid ammonium sulfate and/or bisulfate which can decrease boiler efficiency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.