METHOD FOR PRODUCTION OF HIGHLY ENRICHED C CARBON ISOTOPE Russian patent published in 2022 - IPC B01D59/50 B01D59/04 C01B32/40 F25J3/02 

FIELD: chemistry.

SUBSTANCE: invention relates to processes of separation of stable isotopes by physical and chemical methods. For the production of a highly concentrated ¹³C isotope by low-temperature rectification of carbon oxide CO, as initial raw materials, carbon dioxide CO₂ is used with a natural isotope composition, which is supplied as a supply flow to a countercurrent mass-exchange column between its concentrating and depleting parts. In the column, a simultaneous increase in ¹³C concentration and decrease in ¹⁸O concentration is provided due to chemical isotope exchange between CO₂ and amine carbamate in an organic solvent. A selection flow in the form of gaseous CO₂ from a lower cross-section of the column is reduced to carbon oxide CO with its subsequent purification from CO₂ traces, and is supplied as a supply flow to a low-temperature cascade of CO rectification, where ¹³C concentration is increased to ≥ 99 at.%.

EFFECT: invention allows for reduction in a volume of cryogenic separation equipment in CO rectification and a flow rate of a cooling agent – liquid nitrogen.

2 cl, 3 dwg, 2 tbl, 3 ex