Method for removing nitric oxide, nitrogen dioxide and nitrous oxide from exhaust gas stream
By adding oxygen-containing gas to the exhaust gas of the nitration process to oxidize nitric oxide, followed by water washing and conversion to nitrogen and carbon dioxide under the nitrification catalyst, the problem of efficient removal of nitric oxide, nitrogen dioxide, and nitrous oxide during nitration is solved, reducing treatment costs and the risk of catalyst poisoning, and improving treatment efficiency.
Patent Information
- Application Number
- CN202480078169.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-12-11
- Filing Date
- 2024-12-10
- Publication Date
- 2026-07-10
AI Technical Summary
Existing technologies are difficult to remove nitric oxide, nitrogen dioxide, and nitrous oxide efficiently and economically during nitration, and the catalyst is easily poisoned by hydrogen cyanide, resulting in high treatment costs and low efficiency.
Nitric oxide is oxidized to nitrogen dioxide by adding oxygen-containing gas to the exhaust gas stream. The nitrogen oxide-deficient gas stream is then washed with water. Subsequently, nitrous oxide is converted into nitrogen and carbon dioxide in the presence of a nitrous oxide reduction catalyst and hydrogen cyanide. Hydrogen cyanide is used as a reducing agent to reduce the use of other reducing agents.
It achieves efficient removal of nitric oxide, nitrogen dioxide, and nitrous oxide at low cost and low energy consumption, reducing the use of reducing agents and the risk of catalyst poisoning, and improving treatment efficiency.