METHOD FOR PRODUCING ARGON AND NITROGEN Russian patent published in 2022 - IPC C01B23/00 C01B21/04 C01B21/40 B01D53/14 F25J3/02 F25J3/06 C01B21/26 

FIELD: chemical processes.

SUBSTANCE: invention can be used in the chemical industry. In order to produce argon and nitrogen, process gas 22 containing NOx is subjected to the NOx absorption stage in the absorption tool 23, producing nitric acid 24 and tail gas 25 containing nitrogen, argon, and residual NOx. The tail gas 25 is then subjected to processing including at least one stage of removal of NOx, producing purified tail gas 26. At least part 26b of the purified tail gas is then subjected to the process of separation, producing a first stream 40 of a product containing argon and a second stream 37 of a product containing nitrogen. Proposed is a unit for producing argon and nitrogen.

EFFECT: group of inventions provides a possibility of reducing the material and energy costs and facilitating production of high-purity argon and nitrogen.

16 cl, 2 dwg, 1 ex