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KR950003775A - 산소 및 가압 질소 제조용 3중 컬럼 증류 시스템 - Google Patents

산소 및 가압 질소 제조용 3중 컬럼 증류 시스템 Download PDF

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Publication number
KR950003775A
KR950003775A KR1019940000458A KR19940000458A KR950003775A KR 950003775 A KR950003775 A KR 950003775A KR 1019940000458 A KR1019940000458 A KR 1019940000458A KR 19940000458 A KR19940000458 A KR 19940000458A KR 950003775 A KR950003775 A KR 950003775A
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South Korea
Prior art keywords
pressure column
oxygen
stream
column
medium pressure
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KR1019940000458A
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English (en)
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아그라왈 라케쉬
스티븐 랭스톤 제프리
로저스 폴
슈 지앙구오
Original Assignee
윌리암 에프. 마쉬
에어 프로덕츠 앤드 케미칼스, 인코오포레이티드
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Publication of KR950003775A publication Critical patent/KR950003775A/ko

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    • 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
    • F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
    • F25J3/04187—Cooling of the purified feed air by recuperative heat-exchange; Heat-exchange with product streams
    • F25J3/04193—Division of the main heat exchange line in consecutive sections having different functions
    • F25J3/04206—Division 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
    • 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
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04078—Providing 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
    • F25J3/0409—Providing 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
    • 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
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04284—Generation 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
    • F25J3/0429—Generation 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
    • F25J3/04303—Lachmann expansion, i.e. expanded into oxygen producing or low pressure column
    • 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
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04284—Generation 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
    • F25J3/04309—Generation 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 nitrogen
    • F25J3/04315—Lowest pressure or impure nitrogen, so-called waste nitrogen expansion
    • 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
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04333—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams
    • F25J3/04351—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams 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
    • F25J3/04436—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 at least a triple pressure main column system
    • F25J3/04454—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 at least a triple pressure main column system a main column system not otherwise provided, e.g. serially coupling of columns or more than three pressure levels
    • 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
    • F25J2200/00—Processes or apparatus using separation by rectification
    • F25J2200/20—Processes or apparatus using separation by rectification in an elevated pressure multiple column system wherein the lowest pressure column is at a pressure well above the minimum pressure needed to overcome pressure drop to reject the products to atmosphere
    • 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
    • F25J2200/00—Processes or apparatus using separation by rectification
    • F25J2200/50—Processes or apparatus using separation by rectification using multiple (re-)boiler-condensers at different heights of the column
    • 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
    • F25J2205/02—Processes or apparatus using other separation and/or other processing means using simple phase separation in a vessel or drum
    • 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
    • F25J2250/00—Details related to the use of reboiler-condensers
    • F25J2250/30—External 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
    • F25J2250/40—One fluid being air
    • 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
    • F25J2250/00—Details related to the use of reboiler-condensers
    • F25J2250/30—External 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
    • F25J2250/50—One fluid being oxygen
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S62/00—Refrigeration
    • Y10S62/90—Triple column

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  • 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)

Abstract

본 발명은 공기를 분리시켜 산소 생성물과 질소 생성물을 생성시키기 위한 개선된 극저온 방법에 관한 것이다. 본 발명은, 세개의 증류 컬럼, 즉 저압 컬럼, 중앙 컬럼 및 고압 컬럼을 가진 증류 컬럼 시스템을 사용한다. 본 발명의 3중 컬럼 시스템 방법은,(a)98% 순도 산소 이하의 생성물 순도를 가진 산소 생성물을 생성시키고 아르곤 생성물은 생성시키지 않으며: (b)공급원료 공기의 35%이상을 나타내며 중압 및/또는 고압 컬럼으로부터 배출된 기체상 질소 생성물을 생성시키고 : (c)대부분의 산소 생성물을 저압 컬럼으로부터 회수하며 : 고압 컬럼에서 유래한 고압 질소 헤드부 유출물의 최소한 일부를 중압 컬럼의 액체 스트림에 대하여 열교환시킴으로써 응축된 분량의 최소한 일부를 이용해서 고압 컬럼에 환류물을 제공하는 것을 포함한다.

Description

산소 및 가압 질소 제조용 3중 컬럼 증류 시스템
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제 1 도 및 제 2 도는 본 발명의 방법의 2가지 실시양태를 도식화한 다이아그램이다.

Claims (26)

  1. 압축된 공급원료 공기 스트림을 분리시켜 98% 이하의 순도를 가진 기체상 산소와 높은 회수율을 가진 질소를 제조하는 방법으로서,(a)저압 컬럼, 저압 컬럼보다 높은 압력하에 작동하는 중압 컬럼 및 중압 컬럼보다 높은 압력하에 작동하는 고압 컬럼으로 이루어진 3개의 증류 컬럼을 이용하며 : (b)압축된 공급원료 공기 스트림의 일부를 고압 컬럼에 공급하여, 바닥부 잔액인 고압 산소-농후 액체와 헤드부 유출물인 고압 질소로 증류시키는 단계: (c)상기 고압 산소-농후 액체 바닥부 잔액의 최소한 일부를 중압 컬럼으로 공급하는 단계 : (d)상기 고압 질소 헤드부 유출물의 최소한 일부를 중압 컬럼의 액체 스트림에 대해서 열교환시킴으로써 응축시키고 응축된 고압 질소의 최소한 일부를 사용해서 상기 고압 컬럼으로 환류시키는 단계 : (e)상기 중압 컬럼으로부터 중압 산소-농후 액체를 고압 산소-농후 액체 바닥부 잔액 공급 지점보다 낮은 위치에서 제거하고, 그 제거된 중압 산소-농후 액체를 저압 증류 컬럼의 중간 지점에 공급하는 단계 : (f)상기 저압 컬럼의 바닥부로부터 최소한 일부의 산소 생성물을 생성시키는 단계 : 및 (g)증류 컬럼 시스템에 공급한 공기 유량의 35% 이상을 질소 생성물로 회수하되, 이때 질소 생성물을 고압 컬럼, 중압 컬럼 또는 고압 컬럼과 중압 컬럼의 양자로부터 회수하는 단계를 포함하는 방법.
  2. 제 1 항에 있어서, 상기 단계(d)에서 고압 질소 헤드부 유출물 스트림의 일부를 중압 컬럼의 중간 위치에서 액체와 열교환시킴으로써 응축시키는 방법.
  3. 제 2 항에 있어서, 상기 중압 컬럼의 바닥부에서의 비등은 적당한 가공 스트림의 응축에 의해 발생시키는 방법.
  4. 제 3 항에 있어서, 상기 응축시키고자 하는 적당한 가공 스트림이 고압 컬럼의 압력보다 더 높은 압력하의 질소 스트림인 방법.
  5. 제 4 항에 있어서, 상기 중압 컬럼으로부터 질소-농후 액체 스트림을 고압 산소-농후 액체 바닥부 잔액의 공급 지점보다 높은 위치에서 상기 회수하여 저압 컬럼에 환류물로서 공급하는 방법.
  6. 제 4 항에 있어서, 상기 중압 컬럼의 상단으로부터 기체상 질소 생성물 스트림을 생성시키는 방법.
  7. 제 4 항에 있어서, 상기 저압 컬럼의 바닥부에서의 비등이 적당한 가공 스트림의 응축에 의해 제공되는 방법.
  8. 제 7 항에 있어서, 상기 응축되는 가공 스트림이 질소 스트림인 방법.
  9. 제 8 항에 있어서, 상기 응축되는 질소 스트림이 중압 컬럼의 상단에서 유래한 질소의 일부분인 방법.
  10. 제 6 항에 있어서, 상기 중압 컬럼의 중간 위치로부터 또 다른 질소-농후 스트림을 공동생성물로서 회수하는 방법.
  11. 제 1 항에 있어서, 상기 저압 컬럼의 바닥부터 산소 생성물을 액체로서 회수하여 승압시킨 후에 적당한 가공 스트림과의 열교환에 의해 비등시키는 방법.
  12. 제11항에 있어서, 압축된 공급원료 공기 스트림 일부의 완전 응축에 의해 열교환을 제공하는 방법.
  13. 제11항에 있어서, 공급원료 공기 스트림 일부의 부분 응축에 의해 열교환을 제공하는 방법.
  14. 제 1 항에 있어서, 상기 단계(e)에서 중압 산소-농후 액체를 중압 컬럼의 바닥부에서 생성시키는 방법.
  15. 제 1 항에 있어서, 상기 단계(e)에서 중압 산소-농후 액체를 중압 컬럼의 중간 위치로부터 생성시키는 방법.
  16. 제15항에 있어서, 상기 중압 컬럼의 바닥부로부터 상소 생성을 스트림을 생성시키는 방법.
  17. 제 1 항에 있어서, 상기 단계(g)에서 생성된 질소 생성물을 통합된 기화 전력 발생 시스템으로 급송하는 방법.
  18. 제 4 항에 있어서, 상기 저압 컬럼의 바닥부로부터 산소 생성물을 회수한 후에, 적당한 가공 스트림과의 열교환에 의해 비등시키는 방법.
  19. 제18항에 있어서, 공급원료 공기 스트림 일부분의 완전 응축에 의해 열교환을 제공하는 방법.
  20. 제19항에 있어서, 액체 산소 생성물을 열교환시키기 전에 고압으로 상승시키는 방법.
  21. 제18항에 있어서, 공급원료 공기 스트림 일부분의 부분 응축에 의해 열교환을 제공하는 방법.
  22. 제 4 항에 있어서, 상기 단계(e)에서 중압 산소-농후 액체를 중압 컬럼의 바닥부에서 생성시키는 방법.
  23. 제 4 항이 있어서, 상가 단계(e)에서 중압 산소-농후 액체를 중압 컬럼의 중간 위치로부터 생성시키는 방법.
  24. 제 1 항에 있어서, 상기 단계(g)에서 생성된 질소 생성물을 통합된 기화 전력 발생 시스템으로 복귀시키는 방법.
  25. 제 1 항에 있어서, 상기 단계(d)에서 중압 컬럼의 액체 스트림은 중압 컬럼의 압력으로 또는 그 부근의 압력으로 감소된 압력을 가진, 중압 컬럼에 공급하고자 하는 고압 산소-농후 액체 바닥부 잔액이며, 상기 감압된 산소-농후 액체 바닥부 잔액을 최소한 부분적으로 증기화시키는 방법.
  26. 제 25항에 있어서, 상기 감압된, 고압 산소-농후 액체 바닥부 잔액을 증기화시키는데 사용된 리보일러/응축기가 중압 컬럼 외부에 위치한 것인 방법.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019940000458A 1993-07-15 1994-01-13 산소 및 가압 질소 제조용 3중 컬럼 증류 시스템 KR950003775A (ko)

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