EP0775881A2 - Procédé et dispositif pour la récupération d'oxygène et d'azote à pression superatmosphérique - Google Patents

Procédé et dispositif pour la récupération d'oxygène et d'azote à pression superatmosphérique Download PDF

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Publication number
EP0775881A2
EP0775881A2 EP96118281A EP96118281A EP0775881A2 EP 0775881 A2 EP0775881 A2 EP 0775881A2 EP 96118281 A EP96118281 A EP 96118281A EP 96118281 A EP96118281 A EP 96118281A EP 0775881 A2 EP0775881 A2 EP 0775881A2
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European Patent Office
Prior art keywords
pressure column
low
pressure
column
steam
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Legal status (The legal status 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 status listed.)
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Application number
EP96118281A
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German (de)
English (en)
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EP0775881A3 (fr
EP0775881B1 (fr
Inventor
Dietrich Dipl.-Ing. Rottmann
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Linde GmbH
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Linde GmbH
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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
    • F25J3/04763—Start-up or control of the process; Details of the apparatus used
    • F25J3/04866—Construction and layout of air fractionation equipments, e.g. valves, machines
    • F25J3/04896—Details of columns, e.g. internals, inlet/outlet devices
    • F25J3/04915—Combinations of different material exchange elements, e.g. within different columns
    • 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
    • F25J3/04084—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 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
    • F25J3/04006—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
    • F25J3/04006—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
    • F25J3/04103—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 using solely hydrostatic liquid head
    • 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
    • F25J3/04212—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 and simultaneously condensing vapor from a column serving as reflux within the or another 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
    • F25J3/04321—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 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
    • F25J3/04333—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
    • F25J3/04363—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 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
    • F25J3/04406—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 dual pressure main column system
    • F25J3/04424—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 dual pressure main column system without thermally coupled high and low pressure columns, i.e. a so-called split columns
    • 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
    • F25J3/04654—Producing crude argon in a crude argon column
    • F25J3/04666—Producing crude argon in a crude argon column as a parallel working rectification column of the low pressure column in a dual pressure main column system
    • F25J3/04672—Producing crude argon in a crude argon column as a parallel working rectification column of the low pressure column in a dual pressure main column system having a top condenser
    • F25J3/04678—Producing crude argon in a crude argon column as a parallel working rectification column of the low pressure column in a dual pressure main column system having a top condenser cooled by oxygen enriched liquid from high pressure column bottoms
    • 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
    • F25J3/04763—Start-up or control of the process; Details of the apparatus used
    • F25J3/04866—Construction and layout of air fractionation equipments, e.g. valves, machines
    • F25J3/04872—Vertical layout of cold equipments within in the cold box, e.g. columns, heat exchangers etc.
    • F25J3/04878—Side by side arrangement of multiple vessels in a main column system, wherein the vessels are normally mounted one upon the other or forming different sections of the same 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
    • F25J2235/00—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams
    • F25J2235/50—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams the fluid being oxygen

Definitions

  • the invention relates to a process for the production of oxygen and nitrogen under superatmospheric pressure by low-temperature separation of air in a rectification column system, which has a pressure column and a low-pressure column, with the steps (a) to (g) listed in claim 1.
  • the invention is therefore based on the object of specifying a method and a corresponding device of the type mentioned at the beginning, with which oxygen and nitrogen can be obtained simultaneously under superatmospheric pressure and which work particularly economically, in particular through a high yield of oxygen.
  • This object is achieved by increasing the pressure of the liquid from the lower region of the low pressure column upstream of the indirect heat exchange with condensing steam from the upper region of the pressure column and that part of the steam obtained in the indirect heat exchange which is returned to the low pressure column, is relaxed before the introduction into the low pressure column.
  • the pressures of the pressure column and the low-pressure column are thus decoupled, that is to say the pressure column can be operated under particularly high pressure (for example 8 bar, 10 bar or higher), whereas the pressure in the low-pressure column is only just above atmospheric pressure, for example at 1 , 2 to 2.0 bar, preferably 1.5 to 1.6 bar.
  • the pressure column pressure can depend on the desired nitrogen product pressure - so that the nitrogen product compressor is either made smaller or can be omitted or can be omitted entirely - and the low pressure column can still be operated with an optimal separation effect.
  • the pressure of the liquid from the lower region of the low pressure column can be raised by any of the known methods, for example by a pump and / or by a hydrostatic potential.
  • the final pressure must be sufficient for the liquid to evaporate from the pressure column during the indirect heat exchange with the steam condensing at the pressure column pressure.
  • Indirect heat exchange is used on the one hand to cool the head of the pressure column - liquid return is generated for the pressure column and, if necessary, for the low pressure column - on the other hand - via the detour of an oxygen circuit with pressure increase in the liquid and gaseous expansion - to generate rising steam for the low pressure column.
  • the steam obtained in the indirect heat exchange is preferably warmed against feed air.
  • only part of the warmed gas is expanded into the low pressure column.
  • the rest can then be further heated to ambient temperature and removed as a gaseous oxygen pressure product.
  • the two liquids that are led from the pressure column into the low-pressure column generally consist of sump liquid from the pressure column (first liquid fraction) or from liquid from the top of the pressure column or from an intermediate point that is 10 to 30, preferably 20, theoretical plates below the head the pressure column (second liquid fraction).
  • the expansion of the vapor obtained in the indirect heat exchange by evaporation of the liquid from the lower region of the low-pressure column is preferably carried out in a work-performing manner, for example in an expansion turbine. A lot of process cold can thus be obtained. It is favorable if a magnetically or gas-bearing turbine is used as the expansion turbine.
  • At least part of the energy generated in the expansion of the steam obtained in the indirect heat exchange can be used to compress a process stream, for example to compress a nitrogenous fraction from the low-pressure column to the pressure required to regenerate a molecular sieve system.
  • the devices for expansion or compression are preferably mechanically coupled, for example by a common shaft.
  • the steam obtained in the indirect heat exchange can be heated upstream of the expansion into the low-pressure column. This heating preferably takes place in a main heat exchanger, which also serves to cool the feed air.
  • the part of the steam to be expanded is generally removed from the main heat exchanger at a temperature which lies between the temperatures at the cold and warm ends of the main heat exchanger.
  • Part of the steam obtained in the indirect heat exchange - for example that which is not supplied for relaxation - is preferably obtained as an oxygen pressure product.
  • a single device usually an oxygen pump, is used to generate the increased pressure both for the product quantity and for the quantity circulated for the purpose of cooling.
  • the process according to the invention is also suitable for the production of argon.
  • an argon-containing fraction from the low pressure column can be introduced into a crude argon column. Details of such an argon production are described for example in EP-B-377117, EP-A-628777 or EP-A-669509.
  • the invention also relates to a device for extracting oxygen and nitrogen under superatmospheric pressure by low-temperature separation of air according to claims 7 to 11.
  • Compressed feed air 1, cleaned of water and carbon dioxide, is cooled in a main heat exchanger 2 to about dew point and fed via line 3 into a pressure column 4 under a pressure of 10 bar.
  • vaporous nitrogen which still contains about 1 ppm of impurities, is removed via line 10 and condensed to a portion 11 in a condenser-evaporator 12 designed as a top condenser; the rest is fed via line 14 to the main heat exchanger 2, warmed there to about ambient temperature and discharged at 15 as a gaseous pressure product.
  • the condensate 13 obtained in the condenser-evaporator 12 serves on the one hand as a return for the pressure column 4; on the other hand, it can be partially discharged as a liquid product 16.
  • Oxygen-enriched bottom liquid 5 is throttled as the first liquid fraction from the pressure column into a low-pressure column 7 (6).
  • a second liquid fraction 8 is drawn off 20 theoretical plates below the top of the pressure column and expanded into the low-pressure column 9 above the first liquid fraction, preferably at the top (alternatively or additionally, the liquid drawn off via line 16 could also be applied to the low-pressure column 7).
  • the bottom liquid of the low-pressure column 7 (third liquid fraction 17) is brought to a pressure of approximately 5 bar by a pump 18, subcooled in a countercurrent and introduced into the evaporation space of the condenser-evaporator 12. Part of the pumped liquid can be withdrawn as product 21 if required.
  • the steam 22 obtained in the condenser-evaporator 12 is in the main heat exchanger 2 introduced and partially recovered at the warm end 23 as a gaseous printed product. The rest is led out of the main heat exchanger 2 at an intermediate point (FIG. 24), expanded in a turbine 25 to work at approximately low pressure column pressure and fed back into the low pressure column 7 by the counterflow 19.
  • Nitrogen-containing residual gas 28 is drawn off from the top of the low-pressure column 7, first warmed against the two liquid fractions from the pressure column (29) and finally passed on to the main heat exchanger 2.
  • the heated residual gas 30 can, for example, be discarded or used as a regeneration gas for a molecular sieve system for air purification.
  • the two exemplary embodiments can additionally be equipped with a crude argon column 34; for the case of FIG. 1, this is detailed in FIG. 3.
  • An argon-containing vapor fraction 35 is led from a point of relatively high argon content in the low-pressure column 7 to the crude argon column 34 and broken down there into a crude argon fraction, which is liquidly discharged via line 36, and into a residual fraction 37.
  • the head cooling 39 of the crude argon column 34 is brought about by evaporation of part 38 of the bottom liquid 5 from the pressure column.
  • the resulting steam 40 is fed into the low pressure column 7.
  • the mass transfer elements in the pressure column are formed by still bottoms, those in the low pressure column and, if appropriate, in the crude argon column by orderly packing.
  • conventional still bottoms, packing elements (unordered packing) and / or ordered packing can be used in all columns in the invention. Combinations of different types of elements in one column are also possible. Because of the small Ordered packings are preferred, especially in the low pressure 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)
EP96118281A 1995-11-25 1996-11-14 Procédé et dispositif pour la récupération d'oxygène et d'azote à pression superatmosphérique Expired - Lifetime EP0775881B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19543953A DE19543953C1 (de) 1995-11-25 1995-11-25 Verfahren und Vorrichtung zur Gewinnung von Sauerstoff und Stickstoff unter überatmosphärischem Druck
DE19543953 1995-11-25

Publications (3)

Publication Number Publication Date
EP0775881A2 true EP0775881A2 (fr) 1997-05-28
EP0775881A3 EP0775881A3 (fr) 1997-08-20
EP0775881B1 EP0775881B1 (fr) 2000-05-17

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Application Number Title Priority Date Filing Date
EP96118281A Expired - Lifetime EP0775881B1 (fr) 1995-11-25 1996-11-14 Procédé et dispositif pour la récupération d'oxygène et d'azote à pression superatmosphérique

Country Status (9)

Country Link
US (1) US5749246A (fr)
EP (1) EP0775881B1 (fr)
JP (1) JPH09170874A (fr)
KR (1) KR970028406A (fr)
BR (1) BR9605678A (fr)
CA (1) CA2191161A1 (fr)
DE (2) DE19543953C1 (fr)
TW (1) TW332856B (fr)
ZA (1) ZA969797B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1045154A1 (fr) 1999-04-15 2000-10-18 Ford Global Technologies, Inc., A subsidiary of Ford Motor Company Dispositif de connexion pour l'extrémité d'un câble de commande à monter sur le téton d'un actionneur

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2860576A1 (fr) * 2003-10-01 2005-04-08 Air Liquide Appareil et procede de separation d'un melange gazeux par distillation cryogenique
WO2022058043A1 (fr) * 2020-09-17 2022-03-24 Linde Gmbh Procédé et appareil de séparation cryogénique d'air, à turbine à gaz mixte

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4224045A (en) 1978-08-23 1980-09-23 Union Carbide Corporation Cryogenic system for producing low-purity oxygen
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DE59605238D1 (de) 2000-06-21
CA2191161A1 (fr) 1997-05-26
ZA969797B (en) 1997-06-10
EP0775881A3 (fr) 1997-08-20
EP0775881B1 (fr) 2000-05-17
DE19543953C1 (de) 1996-12-19
TW332856B (en) 1998-06-01
JPH09170874A (ja) 1997-06-30
MX9605785A (es) 1998-05-31
US5749246A (en) 1998-05-12
BR9605678A (pt) 1998-08-18
KR970028406A (ko) 1997-06-24

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