METHOD FOR OBTAINING ULTRAPURE COMPRESSED HELIUM IN CYLINDERS Russian patent published in 2023 - IPC F25J1/00 C01B23/00 

FIELD: chemical industry.

SUBSTANCE: invention relates to the chemical industry, in particular to a method for obtaining ultrapure compressed helium in cylinders based on the purification of helium during its liquefaction. Two modes of obtaining ultrapure helium are carried out due to the autonomous supply to the liquefier of an unpurified helium stream equal in magnitude to the liquefied helium stream. To obtain helium with a concentration of 99.995%-99.999%, the unpurified helium stream is pre-cooled from 300 K to 85 K in the first regenerative heat exchanger and connected to the process flow of the liquefier helium to the adsorber. The combined flow at a temperature of 80 K is purified from O₂ and N₂ impurities in the adsorber, and then part of the purified flow is removed from the adsorber with the pressure of the helium liquefaction process, heated in the first regenerative heat exchanger from 80 K to 280-290 K, after which it is compressed to the working pressure in cylinders and pumped into cylinders. To obtain helium with a concentration of 99.9999%-99.99999%, the second helium purification mode is launched, which is performed by switching the supply of helium obtained in the first purification mode to the input of the neon adsorber, while the helium flow is pre-cooled from 280-290 K in the second regenerative heat exchanger to 25-30 K, connected to the process flow of the helium liquefier and the combined flow at a temperature of 25-30 K, H₂ and Ne impurities are removed in a neon adsorber. Then part of the purified stream is removed from the adsorber with the pressure of the helium liquefaction process, heated in a second regenerative heat exchanger from 25-30 K to 275-280 K, after which it is compressed to the working pressure in cylinders and pumped into cylinders.

EFFECT: reducing energy consumption in the production of ultrapure compressed helium in cylinders.

1 cl, 1 dwg