AIR PURIFICATION Russian patent published in 2016 - IPC B01D53/04 

FIELD: technological processes.

SUBSTANCE: method of reducing water level, carbon dioxide and nitrogen oxide in flow of supplied air before cryogenic distillation, containing: a) forcing said flow of supplied air at temperature and pressure feed in feed direction through first adsorbent, which Henry selectivity for CO₂ above N₂O measured at 30 °C, is at least 12.5, and then through second adsorbent, which Henry constant for adsorption of CO₂, measured at 30 °C, is less than 1,020 mmol/g/atm and which Henry selectivity for CO₂ above N₂O measured at 30 °C, is at most 5; b) said passage of supplied air flow termination in said first and second adsorbents after first period of time; c) lower gas pressure in contact with first and second adsorbents to second pressure is smaller than feed pressure; d) passage of heated regenerating gas at second pressure and temperature which varies from 20 to 80 °C in at least second adsorbent in direction opposite that of supply, during second period of time and then passing second regenerating gas at second pressure and temperature is less than temperature of heated regenerating gas, in first and second adsorbents in direction opposite that of feed during third period of time; e) termination of regenerating gas passage in first and second adsorbents; f) repeated high pressure gas in contact with first and second adsorbents to supply pressure and g) repeating steps a) to f), where second adsorbent occupies from 25 to 40 vol% of total volume of first and second adsorbents and where temperature of heated regenerating gas is by 10 to 60 °C higher than that of second temperature regenerating gas, which of them above; and device adsorbent containing first and second adsorbent, given above, to reduce levels of water, carbon dioxide and nitrogen oxide in flow of supplied air, in which adsorbents regenerated as described above.

EFFECT: reduced level of water, carbon dioxide and nitrogen oxide in flow of supplied air before cryogenic distillation.

12 cl, 10 tbl, 7 dwg