METHOD OF PRODUCING NITRIC ACID Russian patent published in 2024 - IPC C01B21/40 C01B21/26 C01B21/36 B01D53/56 B01D53/86 B01J29/68 B01J29/72 

FIELD: chemistry.

SUBSTANCE: invention can be used in chemical industry. Method of producing nitric acid involves catalytic oxidation of ammonia in the presence of oxygen to form a nitrous gas containing NO, O₂, N₂O and water vapor. Nitrous gas is treated to reduce N₂O and converting NO to NO₂. Catalytic removal of N₂O is carried out by passing gas over the first catalyst at temperature lower than temperature of catalytic oxidation of ammonia. Then catalytic conversion is carried out NO to NO₂ by passing gas over the second catalyst. Obtained treated nitrous gas is used at the absorption step, where NO₂ is absorbed in water to obtain nitric acid. Also disclosed is an apparatus for producing nitric acid, a version of the method of producing nitric acid and using an aged Fe-FER catalyst in the method of producing nitric acid, previously used for decomposition of N₂O in gas containing nitrogen, oxygen, N₂O, NO_x and water, as a catalyst for oxidation of NO to NO₂.

EFFECT: group of inventions increases the degree of oxidation of NO to NO₂, which increases production of nitric acid, while reducing costs and power consumption, as well as pollutant emissions.

25 cl, 2 dwg