METHOD AND SYSTEM FOR EXTRACTION OF PURE HELIUM Russian patent published in 2022 - IPC C01B23/00 B01D53/47 B01D53/22 

FIELD: gas industry.

SUBSTANCE: invention can be used in the extraction of helium from helium-containing gas mixtures, for example from natural gas. For extraction of pure helium, the first helium-containing mixture is supplied to the first stage of membrane separation, the second helium-containing mixture is supplied to the second stage of membrane separation, the third helium-containing mixture is supplied to the third stage of membrane separation. At the first separation stage, the first permeate and the first retentate are formed, at the second separation stage, the second permeate and the second retentate are formed, at the third separation stage, the third permeate and the third retentate are formed. The first supplied mixture is formed using at least one part of the helium-containing initial mixture. The second supplied mixture is formed using at least one part of the first permeate. The third supplied mixture is formed using at least one part of the second retentate. The second permeate is at least partially processed by adsorption at variable pressure to obtain pure helium and the rest mixture. At least one part of the third permeate and/or at least one part of the third retentate are directed back to the method. At the same time, at least one part of the third permeate is used in the formation of the second supplied mixture, and at least one part of the third retentate is used for the formation of the first supplied mixture. At least one part of the rest mixture is used in the formation of the second supplied mixture. A system for extraction of pure helium is also proposed.

EFFECT: inventions allow for increase in the quality of separation at stages of membrane separation.

4 cl, 3 dwg