ZA908000B - Process and apparatus for the production of gaseous oxygen with a variable flow by air distillation - Google Patents

Process and apparatus for the production of gaseous oxygen with a variable flow by air distillation

Info

Publication number
ZA908000B
ZA908000B ZA908000A ZA908000A ZA908000B ZA 908000 B ZA908000 B ZA 908000B ZA 908000 A ZA908000 A ZA 908000A ZA 908000 A ZA908000 A ZA 908000A ZA 908000 B ZA908000 B ZA 908000B
Authority
ZA
South Africa
Prior art keywords
production
variable flow
gaseous oxygen
air distillation
flow
Prior art date
Application number
ZA908000A
Other languages
English (en)
Inventor
Bernard Darredeau
Darredeau Bernard
Original Assignee
Air Liquide
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9386209&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=ZA908000(B) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Air Liquide filed Critical Air Liquide
Publication of ZA908000B publication Critical patent/ZA908000B/xx

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02Processes 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
    • F25J3/04Processes 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
    • F25J3/04006Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04078Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression
    • F25J3/0409Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression of oxygen
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02Processes 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
    • F25J3/04Processes 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
    • F25J3/04151Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
    • F25J3/04187Cooling of the purified feed air by recuperative heat-exchange; Heat-exchange with product streams
    • F25J3/04193Division of the main heat exchange line in consecutive sections having different functions
    • F25J3/04206Division of the main heat exchange line in consecutive sections having different functions including a so-called "auxiliary vaporiser" for vaporising and producing a gaseous product
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02Processes 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
    • F25J3/04Processes 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
    • F25J3/04248Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04284Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams
    • F25J3/0429Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams of feed air, e.g. used as waste or product air or expanded into an auxiliary column
    • F25J3/04303Lachmann expansion, i.e. expanded into oxygen producing or low pressure column
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02Processes 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
    • F25J3/04Processes 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
    • F25J3/04406Processes 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 dual pressure main column system
    • F25J3/04412Processes 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 dual pressure main column system in a classical double column flowsheet, i.e. with thermal coupling by a main reboiler-condenser in the bottom of low pressure respectively top of high pressure column
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02Processes 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
    • F25J3/04Processes 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
    • F25J3/04472Processes 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 the cold from cryogenic liquids produced within the air fractionation unit and stored in internal or intermediate storages
    • F25J3/04496Processes 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 the cold from cryogenic liquids produced within the air fractionation unit and stored in internal or intermediate storages for compensating variable air feed or variable product demand by alternating between periods of liquid storage and liquid assist
    • F25J3/04503Processes 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 the cold from cryogenic liquids produced within the air fractionation unit and stored in internal or intermediate storages for compensating variable air feed or variable product demand by alternating between periods of liquid storage and liquid assist by exchanging "cold" between at least two different cryogenic liquids, e.g. independently from the main heat exchange line of the air fractionation and/or by using external alternating storage systems
    • F25J3/04509Processes 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 the cold from cryogenic liquids produced within the air fractionation unit and stored in internal or intermediate storages for compensating variable air feed or variable product demand by alternating between periods of liquid storage and liquid assist by exchanging "cold" between at least two different cryogenic liquids, e.g. independently from the main heat exchange line of the air fractionation and/or by using external alternating storage systems within the cold part of the air fractionation, i.e. exchanging "cold" within the fractionation and/or main heat exchange line
    • F25J3/04515Simultaneously changing air feed and products output
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2205/00Processes or apparatus using other separation and/or other processing means
    • F25J2205/02Processes or apparatus using other separation and/or other processing means using simple phase separation in a vessel or drum
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2250/00Details related to the use of reboiler-condensers
    • F25J2250/30External or auxiliary boiler-condenser in general, e.g. without a specified fluid or one fluid is not a primary air component or an intermediate fluid
    • F25J2250/40One fluid being air
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2250/00Details related to the use of reboiler-condensers
    • F25J2250/30External or auxiliary boiler-condenser in general, e.g. without a specified fluid or one fluid is not a primary air component or an intermediate fluid
    • F25J2250/50One fluid being oxygen
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S62/00Refrigeration
    • Y10S62/939Partial feed stream expansion, air

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Oxygen, Ozone, And Oxides In General (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
ZA908000A 1989-10-09 1990-10-05 Process and apparatus for the production of gaseous oxygen with a variable flow by air distillation ZA908000B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8913159A FR2652887B1 (fr) 1989-10-09 1989-10-09 Procede et installation de production d'oxygene gazeux a debit variable par distillation d'air.

Publications (1)

Publication Number Publication Date
ZA908000B true ZA908000B (en) 1991-08-28

Family

ID=9386209

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA908000A ZA908000B (en) 1989-10-09 1990-10-05 Process and apparatus for the production of gaseous oxygen with a variable flow by air distillation

Country Status (10)

Country Link
US (1) US5082482A (fr)
EP (1) EP0422974B1 (fr)
JP (1) JP3117702B2 (fr)
AT (1) ATE85696T1 (fr)
AU (1) AU625950B2 (fr)
CA (1) CA2027071C (fr)
DE (1) DE69000903T2 (fr)
ES (1) ES2037535T3 (fr)
FR (1) FR2652887B1 (fr)
ZA (1) ZA908000B (fr)

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2670278B1 (fr) * 1990-12-06 1993-01-22 Air Liquide Procede et installation de distillation d'air en regime variable de production d'oxygene gazeux.
CN1071444C (zh) * 1992-02-21 2001-09-19 普拉塞尔技术有限公司 生产气体氧的低温空气分离系统
GB2274407B (en) * 1993-01-22 1996-06-12 Boc Group Plc The separation of gas mixtures
FR2706195B1 (fr) 1993-06-07 1995-07-28 Air Liquide Procédé et unité de fourniture d'un gaz sous pression à une installation consommatrice d'un constituant de l'air.
FR2706595B1 (fr) * 1993-06-18 1995-08-18 Air Liquide Procédé et installation de production d'oxygène et/ou d'azote sous pression à débit variable.
US5471843A (en) * 1993-06-18 1995-12-05 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process and installation for the production of oxygen and/or nitrogen under pressure at variable flow rate
US5379598A (en) * 1993-08-23 1995-01-10 The Boc Group, Inc. Cryogenic rectification process and apparatus for vaporizing a pumped liquid product
FR2723184B1 (fr) * 1994-07-29 1996-09-06 Grenier Maurice Procede et installation de production d'oxygene gazeux sous pression a debit variable
US5666823A (en) 1996-01-31 1997-09-16 Air Products And Chemicals, Inc. High pressure combustion turbine and air separation system integration
FR2751737B1 (fr) * 1996-07-25 1998-09-11 Air Liquide Procede et installation de production d'un gaz de l'air a debit variable
GB9807833D0 (en) * 1998-04-09 1998-06-10 Boc Group Plc Separation of air
GB9925097D0 (en) * 1999-10-22 1999-12-22 Boc Group Plc Air separation
US6253576B1 (en) * 1999-11-09 2001-07-03 Air Products And Chemicals, Inc. Process for the production of intermediate pressure oxygen
US6233970B1 (en) 1999-11-09 2001-05-22 Air Products And Chemicals, Inc. Process for delivery of oxygen at a variable rate
FR2842124B1 (fr) * 2002-07-09 2005-03-25 Air Liquide Procede de conduite d'une installation de production de gaz alimentee en electricite et cette installation de production
GB0219415D0 (en) * 2002-08-20 2002-09-25 Air Prod & Chem Process and apparatus for cryogenic separation process
US7228715B2 (en) * 2003-12-23 2007-06-12 L'air Liquide, Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude Cryogenic air separation process and apparatus
FR2929697B1 (fr) * 2008-04-07 2010-05-07 Air Liquide Procede de production d'azote gazeux variable et d'oxygene gazeux variable par distillation d'air
US8726691B2 (en) * 2009-01-30 2014-05-20 Praxair Technology, Inc. Air separation apparatus and method
US20100192628A1 (en) * 2009-01-30 2010-08-05 Richard John Jibb Apparatus and air separation plant
US20100192629A1 (en) * 2009-01-30 2010-08-05 Richard John Jibb Oxygen product production method
FR2949845B1 (fr) * 2009-09-09 2011-12-02 Air Liquide Procede d'operation d'au moins un appareil de separation d'air et d'une unite de combustion de combustibles carbones
FR2961586B1 (fr) * 2010-06-18 2014-02-14 Air Liquide Installation et procede de separation d'air par distillation cryogenique
EP2591300A2 (fr) * 2010-07-05 2013-05-15 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Appareil et procede de separation d'air par distillation cryogenique
JP6464399B2 (ja) * 2014-10-03 2019-02-06 神鋼エア・ウォーター・クライオプラント株式会社 空気分離装置

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1250848B (de) * 1967-09-28 Linde Aktiengesellschaft, Wiesbaden Verfahren und Vorrichtung zur Tieftemperaturzerlegung von Luft bei Sauerstoffabnahmeschwankungen
US2846853A (en) * 1954-06-01 1958-08-12 Union Carbide Corp High pressure scrubber liquefier in air separation systems
BE547614A (fr) * 1955-05-31
USRE25193E (en) * 1957-08-16 1962-07-03 Method and apparatus for separating gaseous mixtures
GB864855A (en) * 1958-05-19 1961-04-12 Air Prod Inc Improvements in and relating to methods and apparatus for fractionating gaseous mixtures
US3174293A (en) * 1960-11-14 1965-03-23 Linde Eismasch Ag System for providing gas separation products at varying rates
DE1112997B (de) * 1960-08-13 1961-08-24 Linde Eismasch Ag Verfahren und Einrichtung zur Gaszerlegung durch Rektifikation bei tiefer Temperatur
FR1479561A (fr) * 1966-03-25 1967-05-05 Air Liquide Procédé de preoduction d'un gaz en débit variable
DE2557453C2 (de) * 1975-12-19 1982-08-12 Linde Ag, 6200 Wiesbaden Verfahren zur Gewinnung von gasförmigem Sauerstoff
GB2080929B (en) * 1980-07-22 1984-02-08 Air Prod & Chem Producing gaseous oxygen

Also Published As

Publication number Publication date
EP0422974B1 (fr) 1993-02-10
ATE85696T1 (de) 1993-02-15
CA2027071C (fr) 2000-07-18
AU6388290A (en) 1991-04-11
JPH03134481A (ja) 1991-06-07
DE69000903D1 (de) 1993-03-25
FR2652887A1 (fr) 1991-04-12
US5082482A (en) 1992-01-21
DE69000903T2 (de) 1993-07-01
ES2037535T3 (es) 1993-06-16
JP3117702B2 (ja) 2000-12-18
CA2027071A1 (fr) 1991-04-10
AU625950B2 (en) 1992-07-16
FR2652887B1 (fr) 1993-12-24
EP0422974A1 (fr) 1991-04-17

Similar Documents

Publication Publication Date Title
ZA908000B (en) Process and apparatus for the production of gaseous oxygen with a variable flow by air distillation
ATE23515T1 (de) Anlage zur herstellung von gasfoermigem stickstoff.
EP0102190A3 (fr) Installation pour la production d'oxygène gazeux
CA2128565A1 (fr) Procede de rectification cryogenique et appareil pour vaporiser un produit d'oxygene liquide pompe
KR930018254A (ko) 기체 산소를 생성시키기 위한 저온 공기 분리 시스템
CA2040796A1 (fr) Procede de separation de l'air
FR2542421B1 (fr) Procede et appareil pour produire un gaz a haute purete par vaporisation d'un liquide cryogenique
DE59209795D1 (de) Anlage zur Tieftemperaturzerlegung von Luft
AU1615092A (en) Air separation method for supplying gaseous oxygen in accordance with a variable demand pattern
ZA200007750B (en) Method for extracting xenon.
KR860001329A (ko) 고순도 질소가스 제조장치
TW327204B (en) Method and apparatus for producing liquid products from air in various proportions
DE3567528D1 (en) Reservoir for a cryogenic mixture and process for drawing off the liquid
KR930000280B1 (ko) 가스상 피이드로부터 초고순도산소를 제조하는 방법 및 그 장치
US4869741A (en) Ultra pure liquid oxygen cycle
KR850005606A (ko) 고순도 질소가스 제조장치
KR930000281B1 (ko) 액체피이드로부터 초고순도산소를 제조하는 방법 및 그 장치
TW237436B (fr)
US3960519A (en) Method and system for generating a dehydrated inert gas stream
GB1528428A (en) Production of gaseous oxygen by the two stage low-temperature rectification of air
KR970007267A (ko) 고순도 질소 가스 발생기
DE59204108D1 (de) Vorrichtung zur Herstellung eines unter Druck stehenden kalten Gasstromes.
GB1231328A (fr)
KR850000652A (ko) 공기분리방법
JPS5578899A (en) Low temperature generating device