Linde Gmbh

Patrick Schiffmann

Martin Bauer

Tobias Keller

The invention relates to a method (-) for extracting pure helium using a first membrane separation stage (), a second membrane separation stage (), and a third membrane separation stage (), in which a first helium-containing feed mixture is supplied to the first membrane separation stage (), a second helium-containing feed mixture is supplied to the second membrane separation stage (), and a third helium-containing feed mixture is supplied to the third membrane separation stage (), and in which a first permeate and a first retentate are formed in the first membrane separation stage (), a second permeate and a second retentate are formed in the second membrane separation stage (), and a third permeate and a third retentate are formed in the third membrane separation stage (). According to the invention, the first feed mixture is formed using at least one portion of a helium-containing starting mixture, the second feed mixture is formed using at least one portion of the first permeate, the third feed mixture is formed using at least one portion of the second retentate, the second permeate is at least partially processed by pressure-swing adsorption in order to obtain the pure helium and a remaining mixture, and at least one portion of the third permeate and/or at least one portion of the third retentate is guided back into the method (). The invention also relates to a corresponding system.

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Munich, Germany

Patrick Schiffmann