Process for helium enrichment

Abstract A process is described for obtaining a helium-enriched fraction (16) from a fraction (1) comprising essentially 5 methane, nitrogen and helium, for example an LNG fraction. According to the invention, this process comprises the following process steps: 10 a) decompressing (a) and separating...

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Bibliographische Detailangaben
Hauptverfasser:	BAUER, HEINZ, SAPPER, RAINER, GWINNER, MARTIN
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING COMBINED HEATING AND REFRIGERATION SYSTEMS HEAT PUMP SYSTEMS HEATING LIGHTING LIQUEFACTION SOLIDIFICATION OF GASES LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS MANUFACTURE OR STORAGE OF ICE MECHANICAL ENGINEERING MIXTURES BY PRESSURE AND COLD TREATMENT REFRIGERATION OR COOLING WEAPONS
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Beschreibung
Zusammenfassung:	Abstract A process is described for obtaining a helium-enriched fraction (16) from a fraction (1) comprising essentially 5 methane, nitrogen and helium, for example an LNG fraction. According to the invention, this process comprises the following process steps: 10 a) decompressing (a) and separating (D3) the fraction (1) comprising essentially methane, nitrogen and helium into a helium-richer gas fraction (6) comprising methane and nitrogen and a liquid fraction (7) comprising methane and nitrogen, b) decompressing (d) and separating (D4) the liquid fraction (7) comprising methane and nitrogen into a nitrogen-rich gas fraction (8) and a methane-rich liquid fraction (17), c) cooling and partially condensing (E) the helium-richer gas fraction (6) comprising methane and nitrogen, d) separating (D7) the partially condensed helium-richer 25 fraction (6) comprising methane and nitrogen into a helium-enriched gas fraction (13) and a nitrogen/methane-rich liquid fraction (14), and e) decompressing (k) and evaporating the nitrogen/ 30 methane-rich liquid fraction (14) in indirect heat exchange (E) with the helium-richer fraction (6) which comprises methane and nitrogen and is to be partially condensed.