ABSORPTION COLUMN AND METHOD OF PRODUCING NITRIC ACID Russian patent published in 2024 - IPC C01B21/40 B01D53/14 

FIELD: chemistry.

SUBSTANCE: group of inventions relates to a vertical absorption column, absorption methods for the production of nitric acid, a method for minimizing the amount of nitrogen oxides in the exhaust gas from the absorption column, use of absorption column and structured packing, where nitrogen oxides are absorbed by water using structured packing and specially designed liquid distributor. Absorption column comprises a liquid distributor comprising a loading box having a toothed overflow barrier for distributing liquid through the upwardly directed teeth of the toothed overflow barrier into perforated trays of liquid distributor and located directly above structured packing. Structured packing represents a plate-like packing containing a plurality of horizontal plates containing cooling devices. Column also comprises an inlet for introducing oxygen into the lower part of the vertical absorption column, inlet for process gas containing nitrogen oxides from ammonia oxidation process in lower part of vertical absorption column, inlet for aqueous solution in upper part of vertical absorption column, at least one outlet for nitric acid in the lower part of the vertical absorption column and an outlet for exhaust gas containing nitrogen oxides in the upper part of the vertical absorption column. Invention also relates to an absorption method of producing an aqueous solution of nitric acid by absorbing nitrogen oxides with water in a vertical absorption column, to a method of producing nitric acid, to a method of minimizing the amount of gaseous nitrogen oxides in exhaust gas from a vertical absorption column to use of an absorption column and to use of a structured packing in an absorption column.

EFFECT: group of inventions provides more effective absorption of gaseous nitrogen oxides, which in turn allows reducing the size of the absorption column and/or reducing emissions of nitrogen oxides through the outlet of the absorption column.

18 cl, 5 dwg, 2 tbl, 1 ex