Method of treating exhaust gas discharged from nitric acid plant
US4115516A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 10, 1977 |
| Grant date | Sep 19, 1978 |
| Priority date | — |
| Expiry date | Jun 10, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D53/56
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A compressed exhaust gas containing nitrogen oxides discharged from a compressed absorption type nitric acid plant is treated by adding ammonia or an ammonia precursor to the gas and passing the gas through a NO.sub.x removing catalytic layer to an exhaust gas turbine wherein the temperature of the main flow of the exhaust gas in the zone from the point of which ammonia or an ammonia precursor is added to the outlet of the exhaust gas turbine is maintained at a temperature higher than T.degree. K = 10.sup.3 / (1.91 - 0.228 log P) [P : a sum of partial pressures of ammonia and nitrogen oxides (atm.)] and feeding an inert gas into the place of the zone in which the exhaust gas stagnates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.