Mono Pressure System For Producing Nitric Acid And Method Of Operating Thereof
Patent No. EP4392371 (titled "Mono Pressure System For Producing Nitric Acid And Method Of Operating Thereof") was filed by Yara ASA on Aug 25, 2022. The application was issued on Oct 1, 2025.
Patent Summary
This mono-pressure nitric acid production plant reduces power consumption and emissions by replacing large air compressors with a combination of an oxygen-rich gas source (e.g., high-pressure water electrolyzer) and recirculated tail gas. The system comprises a mixing apparatus for combining ammonia with a first oxygen-containing gas, an ammonia converter operating at pressure P1 (maintaining an $\text{O}_2/\text{NH}_3$ molar ratio $\ge 1.2$), a gas cooler/condenser, an absorption tower, and a tail gas heater. A splitting means divides the tail gas into a second stream and a first stream; the latter is pressurized to P1 and mixed with the oxygen-rich gas to form the first oxygen-containing gas. A second oxygen supply ensures the final tail gas contains $\ge 0.5\text{ vol\% } \text{O}_2$.
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Dossier Documents
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Date
Description
EP4392371
- Application Number
- EP22769199A
- Filing Date
- Aug 25, 2022
- Status
- Granted And Under Opposition
- Aug 29, 2025
- Publication Date
- Oct 1, 2025
- External Links
- Slate, Register , Google Patents