Process to recover liquid methane

To recover liquid methane from a feed gas mixture (1) essentially consisting of methane, C2+ hydrocarbons, carbon dioxide and nitrogen, the feed gas mixture (1) is fed first to an adsorption unit (E) and freed from water; dried feed gas mixture (2) is fed to a membrane separating unit (F), wherein t...

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Bibliographische Detailangaben
Hauptverfasser:	FOERG, WOLFGANG, STOCKMAN, RUDOLF
Format:	Patent
Sprache:	eng
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS BLASTING CHEMISTRY 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 METALLURGY MIXTURES BY PRESSURE AND COLD TREATMENT ORGANIC CHEMISTRY REFRIGERATION OR COOLING WEAPONS
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Beschreibung
Zusammenfassung:	To recover liquid methane from a feed gas mixture (1) essentially consisting of methane, C2+ hydrocarbons, carbon dioxide and nitrogen, the feed gas mixture (1) is fed first to an adsorption unit (E) and freed from water; dried feed gas mixture (2) is fed to a membrane separating unit (F), wherein the carbon dioxide is separated down to a residual content less than 2% by volume (9) and resultant gas mixture (3) now essentially consisting of methane, C2+ hydrocarbons and nitrogen is fed to a low-temperature distillation (A) wherein the C2+ hydrocarbons as well as the residual content of carbon dioxide are separated by distillation.