DE102019107362A1 - Process for the fractionation of liquefied air or liquefied gas mixtures by membrane technology - Google Patents

Process for the fractionation of liquefied air or liquefied gas mixtures by membrane technology Download PDF

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Publication number
DE102019107362A1
DE102019107362A1 DE102019107362.6A DE102019107362A DE102019107362A1 DE 102019107362 A1 DE102019107362 A1 DE 102019107362A1 DE 102019107362 A DE102019107362 A DE 102019107362A DE 102019107362 A1 DE102019107362 A1 DE 102019107362A1
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Prior art keywords
liquefied
air
separation
gas mixture
fractionation
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German (de)
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Ulf Henkel
Anne Berger
Ananta Süß
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NIKKISO CRYOTEC GMBH, DE
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CRYOTEC Anlagenbau GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/0204—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the feed stream
    • F25J3/0209—Natural gas or substitute natural gas
    • F25J3/0214—Liquefied natural gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/0228—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream
    • F25J3/0233—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream separation of CnHm with 1 carbon atom or more
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/0228—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream
    • F25J3/0238—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream separation of CnHm with 2 carbon atoms or more
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/0228—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream
    • F25J3/0257—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream separation of nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04636—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a hybrid air separation unit, e.g. combined process by cryogenic separation and non-cryogenic separation techniques
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04642—Recovering noble gases from air
    • F25J3/04648—Recovering noble gases from air argon
    • F25J3/04721—Producing pure argon, e.g. recovered from a crude argon column
    • F25J3/04733—Producing pure argon, e.g. recovered from a crude argon column using a hybrid system, e.g. using adsorption, permeation or catalytic reaction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2256/00—Main component in the product gas stream after treatment
    • B01D2256/18—Noble gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/50—Carbon oxides
    • B01D2257/504—Carbon dioxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/40—Processes or apparatus using other separation and/or other processing means using hybrid system, i.e. combining cryogenic and non-cryogenic separation techniques
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/80—Processes or apparatus using other separation and/or other processing means using membrane, i.e. including a permeation step

Abstract

Die Erfindung betrifft ein Verfahren zur Fraktionierung verflüssigter Luft oder anderweitiger Gasgemische mittels kryogener Membranseparation, wobei eine verdichtete, vorgereinigte Gasmenge einer Verflüssigung unterzogen und dann der kryogenen Membranseparation unterworfen wird.The invention relates to a method for fractionating liquefied air or other gas mixtures by means of cryogenic membrane separation, wherein a compressed, pre-purified amount of gas is subjected to a liquefaction and then subjected to the cryogenic membrane separation.

Description

Die Erfindung betrifft ein Verfahren zur Fraktionierung verflüssigter Luft oder verflüssigter Gasgemische mittels Membrantechnologie gemäß der Lehre nach Anspruch 1.The invention relates to a method for fractionating liquefied air or liquefied gas mixtures by means of membrane technology according to the teaching of claim 1.

Allgemein wird unter Luftzerlegung eine Trennung von sauberer und trockener Luft in ihre Hauptbestandteile, insbesondere Stickstoff, Sauerstoff und Argon als Edelgas verstanden. Dabei werden verschiedene Technologien eingesetzt.In general, air separation means a separation of clean and dry air into its main constituents, in particular nitrogen, oxygen and argon as inert gas. Different technologies are used.

Bekannt sind drei Verfahren zur Luftzerlegung, die sich großtechnisch bewährt haben. Hier unterscheidet man die Tieftemperaturrektifikation als kryogene Destillation, die Druckwechsel-Adsorption (PSA) und die sogenannte Membrantechnik.Are known three methods for air separation, which have proven industrially. A distinction is made here between cryogenic rectification as cryogenic distillation, pressure swing adsorption (PSA) and so-called membrane technology.

Die kryogene Luftzerlegung ist für die Produktion kleiner und mittlerer Kapazitäten und bei geringen Anforderungen an die Reinheit der Gase nicht wirtschaftlich.Cryogenic air separation is not economical for the production of small and medium capacities and with low demands on the purity of the gases.

Für diese Problematik ist das PSA-Verfahren und die Technologie der Membrantechnik von Bedeutung.For this problem, the PSA process and the technology of membrane technology is of importance.

Membranbasierte Gastrennverfahren haben in den letzten Jahrzehnten eine zunehmende Bedeutung und Anwendung erfahren. Aufgrund ihrer wesentlichen Vorteile, wie niedriger Energieverbrauch, keine Verwendung von Chemikalien und weniger beweglichen Teilen in den Anlagen, ergeben sich potentiell geringere Betriebs- und Wartungskosten.Membrane-based gas separation processes have gained increasing importance and application in recent decades. Due to their significant advantages, such as low energy consumption, no use of chemicals and less moving parts in the equipment, potentially lower operating and maintenance costs.

Aus dem Stand der Technik ist gemäß DE 10 2015 012 317 A1 ein Verfahren zur trenntechnischen Bearbeitung eines überwiegend oder ausschließlich Kohlenmonoxid und Wasserstoff enthaltenden Einsatzgemisches bekannt, bei dem das Einsatzgemisch einem kryogenen Trennprozess unterworfen wird, in dem eine kohlenmonoxidreiche Flüssigkeit und wenigstens ein gegenüber dem Einsatzgemisch an Kohlenmonoxid abgereichertes und ein Wasserstoff angereichertes Restgasgemisch gebildet werden.From the prior art is according to DE 10 2015 012 317 A1 a process for the separation processing of a predominantly or exclusively carbon monoxide and hydrogen-containing feed mixture known in which the feed mixture is subjected to a cryogenic separation process in which a carbon monoxide-rich liquid and at least one compared to the feed mixture of carbon monoxide depleted and a hydrogen-enriched residual gas mixture are formed.

Die GB 2 181 528 A1 zeigt ein Verfahren zum Trennen von Luft, umfassend die Schritte des Extrahierens von Wasserdampf und Kohlendioxid aus der Luft in eine Extraktionseinrichtung, Abkühlen der Luft auf eine kryogene Temperatur und Durchführen einer Fraktionierung zur Erzeugung von Sauerstoff und Stickstoffprodukten und eines Stickstoffstroms, wobei wenigstens ein Teil des Stickstoffstroms verwendet wird, um Wasserdampf und Kohlendioxid aus der Extraktionseinrichtung einer Reinigung zu unterziehen und wenigstens einen Teil des resultierenden, verunreinigungsbeladenen Stickstoffstroms einer Reinigung zu unterwerfen. Auch wird offenbart, dass die mit Verunreinigungen beladene Substanz durch Membrantrennung gereinigt werden kann.The GB 2 181 528 A1 shows a process for separating air, comprising the steps of extracting water vapor and carbon dioxide from the air into an extractor, cooling the air to a cryogenic temperature, and performing fractionation to produce oxygen and nitrogen products and a nitrogen stream, wherein at least part of the Nitrogen stream is used to purify water vapor and carbon dioxide from the extraction device to a purification and to subject at least a portion of the resulting pollution-laden nitrogen stream to a purification. It is also disclosed that the contaminated substance can be purified by membrane separation.

Die US 4 595 405 B betrifft ein Verfahren zum Trennen von Komponenten eines Gasstromes durch Integrieren einer kryogenen Trenneinheit mit einer Membrantrenneinheit. Zudem wird die Erzeugung eines oder mehrerer stickstoffreicher Ströme in der Gas- oder Flüssigphase oder beides aus einem aus Sauerstoff und Stickstoff bestehenden Strom, zum Beispiel Luft, aufgezeigt.The US 4,595,405 B relates to a method of separating components of a gas stream by integrating a cryogenic separation unit with a membrane separation unit. In addition, the production of one or more nitrogen-rich streams in the gas or liquid phase or both from a current consisting of oxygen and nitrogen, for example air, is shown.

Die US 5 049 174 A bezieht sich auf ein Verfahren zum Trennen ausgewählter Komponenten eines Gasstromes unter Rückgriff auf eine kryogene Trenneinheit nebst Membraneinrichtung. Die gleichzeitige Erzeugung eines argonreichen Stromes in der Gas- oder Flüssigphase zusammen mit einem stickstoffreichen Produktstrom, die beide aus einem Strom erzeugt werden, der normalerweise Sauerstoff, Stickstoff und Argon, zum Beispiel Luft, enthält, wird ebenfalls offenbart. Das bekannte System verwendet eine Membraneinrichtung, um vorzugsweise die Sauerstoffkomponente aus dem Rückführstrom der kryogenen Einheit abzusondern, wobei gleichzeitig die Argon-Komponente akkumuliert wird, um deren Abtrennung als einen mit Argon angereicherten Produktstrom zu ermöglichen.The US 5 049 174 A refers to a method for separating selected components of a gas stream using a cryogenic separation unit and membrane device. Co-generation of an argon-rich gas or liquid phase stream together with a nitrogen-rich product stream, both of which are generated from a stream which normally contains oxygen, nitrogen and argon, for example air, is also disclosed. The known system employs membrane means to preferentially separate the oxygen component from the cryogenic unit recycle stream while concurrently accumulating the argon component to permit its separation as an argon-enriched product stream.

Aus dem Vorgenannten ist es Aufgabe der Erfindung, ein weiterentwickeltes Verfahren zur Trennung von Gasen oder Gasgemischen in flüssiger Form mittels Membranen zu entwickeln, um die Erzeugung hochreiner Gase mit kleiner und mittlerer Kapazität wirtschaftlich durchführen zu können.From the foregoing, it is an object of the invention to develop a further developed process for the separation of gases or gas mixtures in liquid form by means of membranes in order to carry out the production of high purity gases with small and medium capacity economically.

Das erfindungsgemäße Verfahren ist nicht nur zur Trennung von Luft in deren Gasbestandteile geeignet, sondern kann auch zur Trennung von N2 bei LNG, zur Eliminierung des Hydrokarbons von LNG, aber auch zur CO2-Rückgewinnung bei der Extraktion mit überkritischen CO2 Anwendung finden.The process according to the invention is not only suitable for the separation of air in its gas components, but can also be used for the separation of N 2 in LNG, for the elimination of the hydrocarbons of LNG, but also for CO 2 recovery in the extraction with supercritical CO 2 application.

Das erfindungsgemäße Verfahren umfasst folgende Schritte.The method according to the invention comprises the following steps.

Das Gasgemisch, insbesondere Luft, wird zunächst einer Kompression unterzogen.The gas mixture, in particular air, is first subjected to compression.

Nach einer derartigen Verdichtung erfolgt eine Reinigung und Trocknung des Gasgemisches, wobei CO2 und H2O abgetrennt werden.After such compression, a cleaning and drying of the gas mixture, wherein CO 2 and H 2 O are separated.

Das derart gereinigte Gemisch unterliegt dann einer Verflüssigung.The thus purified mixture is then subject to liquefaction.

Die verflüssigte Komponente wird dann einer kryogenen Membran-Separation unterzogen, so dass im Falle von Luft Stickstoff und Sauerstoff sowie Argon als Edelgas in flüssiger Form separierbar sind.The liquefied component is then subjected to a cryogenic membrane separation, so in the case of air, nitrogen and oxygen as well as argon are separable as inert gas in liquid form.

ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION

Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Zitierte PatentliteraturCited patent literature

  • DE 102015012317 A1 [0007]DE 102015012317 A1 [0007]
  • GB 2181528 A1 [0008]GB 2181528 A1 [0008]
  • US 4595405 [0009]US 4595405 [0009]
  • US 5049174 A [0010]US 5049174A [0010]

Claims (3)

Verfahren zur Fraktionierung verflüssigter Luft oder verflüssigter Gasgemische mittels Membrantechnologie mit folgenden Schritten: - Verdichtung des Gasgemisches; - Reinigung und Trocknung des Gasgemisches; - Verflüssigung des gereinigten und getrockneten Gasgemisches; - Durchführung einer kryogenen Membranseparation unter Erhalt einzelner, verflüssigter Gase aus dem ursprünglichen Gasgemisch.Process for the fractionation of liquefied air or liquefied gas mixtures by membrane technology, comprising the following steps: - compression of the gas mixture; - cleaning and drying of the gas mixture; - liquefaction of the purified and dried gas mixture; - Carrying out a cryogenic membrane separation to obtain individual, liquefied gases from the original gas mixture. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Schritt der Reinigung das Abscheiden störender Bestandteile, wie insbesondere CO2 und/oder H2O umfasst.Method according to Claim 1 , characterized in that the step of cleaning comprises the separation of interfering constituents, in particular CO 2 and / or H 2 O. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Schritt der kryogenen Membranseparation im Falle eines Gasgemisches in Form von Luft die Abtrennung von Stickstoff, Sauerstoff und Edelgasen, insbesondere Argon, umfasst.Method according to Claim 1 or 2 , characterized in that the step of the cryogenic membrane separation in the case of a gas mixture in the form of air, the separation of nitrogen, oxygen and noble gases, in particular argon comprises.
DE102019107362.6A 2018-04-30 2019-03-22 Process for the fractionation of liquefied air or liquefied gas mixtures by membrane technology Pending DE102019107362A1 (en)

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