NO834422L - Fremstilling av nitrogen ved kryogen separering av luft - Google Patents

Fremstilling av nitrogen ved kryogen separering av luft

Info

Publication number
NO834422L
NO834422L NO834422A NO834422A NO834422L NO 834422 L NO834422 L NO 834422L NO 834422 A NO834422 A NO 834422A NO 834422 A NO834422 A NO 834422A NO 834422 L NO834422 L NO 834422L
Authority
NO
Norway
Prior art keywords
nitrogen
preparation
air
cryogen
separation
Prior art date
Application number
NO834422A
Other languages
English (en)
Other versions
NO162258B (no
Inventor
Ravindra Fulchand Pahade
John Harold Ziemer
Harry Cheung
Original Assignee
Union Carbide Corp
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=23772305&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=NO834422(L) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Union Carbide Corp filed Critical Union Carbide Corp
Publication of NO834422L publication Critical patent/NO834422L/no
Publication of NO162258B publication Critical patent/NO162258B/no

Links

Classifications

    • 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
    • F25J3/04151—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
    • 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
    • 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
    • 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
    • F25J3/04406—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
    • F25J3/04412—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 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
    • 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
    • F25J2200/54—Processes or apparatus using separation by rectification using multiple (re-)boiler-condensers at different heights of the column in the low pressure column of a double pressure main column system
    • 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
    • F25J2215/00—Processes characterised by the type or other details of the product stream
    • F25J2215/40—Air or oxygen enriched air, i.e. generally less than 30mol% of O2

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)
  • Ceramic Products (AREA)
  • Glass Compositions (AREA)
  • Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
NO834422A 1982-12-02 1983-12-01 Fremgangsm te for fremstilling av nitrogengass. NO162258B (no)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/446,363 US4453957A (en) 1982-12-02 1982-12-02 Double column multiple condenser-reboiler high pressure nitrogen process

Publications (2)

Publication Number Publication Date
NO834422L true NO834422L (no) 1984-06-04
NO162258B NO162258B (no) 1989-08-21

Family

ID=23772305

Family Applications (1)

Application Number Title Priority Date Filing Date
NO834422A NO162258B (no) 1982-12-02 1983-12-01 Fremgangsm te for fremstilling av nitrogengass.

Country Status (6)

Country Link
US (1) US4453957A (no)
CA (1) CA1210315A (no)
DK (1) DK161084C (no)
GB (1) GB2131147B (no)
NL (1) NL8304118A (no)
NO (1) NO162258B (no)

Families Citing this family (48)

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Publication number Priority date Publication date Assignee Title
US4604117A (en) * 1984-11-15 1986-08-05 Union Carbide Corporation Hybrid nitrogen generator with auxiliary column drive
FR2578532B1 (fr) * 1985-03-11 1990-05-04 Air Liquide Procede et installation de production d'azote
GB8512562D0 (en) * 1985-05-17 1985-06-19 Boc Group Plc Liquid-vapour contact method
DE3528374A1 (de) * 1985-08-07 1987-02-12 Linde Ag Verfahren und vorrichtung zur erzeugung von stickstoff mit ueberatmosphaerischem druck
US4617036A (en) * 1985-10-29 1986-10-14 Air Products And Chemicals, Inc. Tonnage nitrogen air separation with side reboiler condenser
AT386279B (de) * 1986-04-02 1988-07-25 Voest Alpine Ag Vorrichtung zur zerlegung von gasen mittels koaxial ineinander angeordneter rektifikationskolonnen
US4715874A (en) * 1986-09-08 1987-12-29 Erickson Donald C Retrofittable argon recovery improvement to air separation
US4775399A (en) * 1987-11-17 1988-10-04 Erickson Donald C Air fractionation improvements for nitrogen production
US4783210A (en) * 1987-12-14 1988-11-08 Air Products And Chemicals, Inc. Air separation process with modified single distillation column nitrogen generator
US4822395A (en) * 1988-06-02 1989-04-18 Union Carbide Corporation Air separation process and apparatus for high argon recovery and moderate pressure nitrogen recovery
US4869742A (en) * 1988-10-06 1989-09-26 Air Products And Chemicals, Inc. Air separation process with waste recycle for nitrogen and oxygen production
US4848996A (en) * 1988-10-06 1989-07-18 Air Products And Chemicals, Inc. Nitrogen generator with waste distillation and recycle of waste distillation overhead
US5116396A (en) * 1989-05-12 1992-05-26 Union Carbide Industrial Gases Technology Corporation Hybrid prepurifier for cryogenic air separation plants
US4934148A (en) * 1989-05-12 1990-06-19 Union Carbide Corporation Dry, high purity nitrogen production process and system
US4931070A (en) * 1989-05-12 1990-06-05 Union Carbide Corporation Process and system for the production of dry, high purity nitrogen
US5004482A (en) * 1989-05-12 1991-04-02 Union Carbide Corporation Production of dry, high purity nitrogen
US4957524A (en) * 1989-05-15 1990-09-18 Union Carbide Corporation Air separation process with improved reboiler liquid cleaning circuit
US5006137A (en) * 1990-03-09 1991-04-09 Air Products And Chemicals, Inc. Nitrogen generator with dual reboiler/condensers in the low pressure distillation column
US5069699A (en) * 1990-09-20 1991-12-03 Air Products And Chemicals, Inc. Triple distillation column nitrogen generator with plural reboiler/condensers
US5098457A (en) * 1991-01-22 1992-03-24 Union Carbide Industrial Gases Technology Corporation Method and apparatus for producing elevated pressure nitrogen
FR2685459B1 (fr) * 1991-12-18 1994-02-11 Air Liquide Procede et installation de production d'oxygene impur.
US5233838A (en) * 1992-06-01 1993-08-10 Praxair Technology, Inc. Auxiliary column cryogenic rectification system
US6205374B1 (en) * 1993-07-01 2001-03-20 Mazda Motor Corporation Vehicle characteristic change system and method
US5402647A (en) * 1994-03-25 1995-04-04 Praxair Technology, Inc. Cryogenic rectification system for producing elevated pressure nitrogen
GB9500120D0 (en) * 1995-01-05 1995-03-01 Boc Group Plc Air separation
US5697229A (en) * 1996-08-07 1997-12-16 Air Products And Chemicals, Inc. Process to produce nitrogen using a double column plus an auxiliary low pressure separation zone
US5682762A (en) * 1996-10-01 1997-11-04 Air Products And Chemicals, Inc. Process to produce high pressure nitrogen using a high pressure column and one or more lower pressure columns
US5682764A (en) * 1996-10-25 1997-11-04 Air Products And Chemicals, Inc. Three column cryogenic cycle for the production of impure oxygen and pure nitrogen
US5761927A (en) * 1997-04-29 1998-06-09 Air Products And Chemicals, Inc. Process to produce nitrogen using a double column and three reboiler/condensers
US6009723A (en) * 1998-01-22 2000-01-04 Air Products And Chemicals, Inc. Elevated pressure air separation process with use of waste expansion for compression of a process stream
US6065306A (en) * 1998-05-19 2000-05-23 The Boc Group, Inc. Method and apparatus for purifying ammonia
US5934104A (en) * 1998-06-02 1999-08-10 Air Products And Chemicals, Inc. Multiple column nitrogen generators with oxygen coproduction
DE19902255A1 (de) * 1999-01-21 2000-07-27 Linde Tech Gase Gmbh Verfahren und Vorrichtung zur Gewinnung von Druckstickstoff
GB0119500D0 (en) * 2001-08-09 2001-10-03 Boc Group Inc Nitrogen generation
US6499312B1 (en) 2001-12-04 2002-12-31 Praxair Technology, Inc. Cryogenic rectification system for producing high purity nitrogen
US7114352B2 (en) * 2003-12-24 2006-10-03 Praxair Technology, Inc. Cryogenic air separation system for producing elevated pressure nitrogen
US8640496B2 (en) * 2008-08-21 2014-02-04 Praxair Technology, Inc. Method and apparatus for separating air
US20110138856A1 (en) * 2009-12-10 2011-06-16 Henry Edward Howard Separation method and apparatus
US8820115B2 (en) * 2009-12-10 2014-09-02 Praxair Technology, Inc. Oxygen production method and apparatus
EP3059536A1 (de) * 2015-02-19 2016-08-24 Linde Aktiengesellschaft Verfahren und Vorrichtung zur Gewinnung eines Druckstickstoffprodukts
EP3290843A3 (de) 2016-07-12 2018-06-13 Linde Aktiengesellschaft Verfahren und vorrichtung zur erzeugung von druckstickstoff und flüssigstickstoff durch tieftemperaturzerlegung von luft
AU2018269511A1 (en) 2017-05-16 2019-11-28 Terrence J. Ebert Apparatus and process for liquefying gases
DE102018000842A1 (de) * 2018-02-02 2019-08-08 Linde Aktiengesellschaft Verfahren und Vorrichtung zur Gewinnung von Druckstickstoff durch Tieftemperaturzerlegung von Luft
EP3757493A1 (de) 2019-06-25 2020-12-30 Linde GmbH Verfahren und anlage zur gewinnung eines stickstoffreichen und eines sauerstoffreichen luftprodukts unter einsatz einer tieftemperaturzerlegung von luft
WO2021242308A1 (en) 2020-05-26 2021-12-02 Praxair Technology, Inc. Enhancements to a dual column nitrogen producing cryogenic air separation unit
WO2021242309A1 (en) 2020-05-26 2021-12-02 Praxair Technology, Inc. Enhancements to a dual column nitrogen producing cryogenic air separation unit
WO2021242307A1 (en) 2020-05-28 2021-12-02 Praxair Technology, Inc. Enhancements to a dual column nitrogen producing cryogenic air separation unit
US11674750B2 (en) 2020-06-04 2023-06-13 Praxair Technology, Inc. Dual column nitrogen producing air separation unit with split kettle reboil and integrated condenser-reboiler

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US2873583A (en) * 1954-05-04 1959-02-17 Union Carbide Corp Dual pressure cycle for air separation
US3210947A (en) * 1961-04-03 1965-10-12 Union Carbide Corp Process for purifying gaseous streams by rectification
US3203193A (en) * 1963-02-06 1965-08-31 Petrocarbon Dev Ltd Production of nitrogen
US3217502A (en) * 1963-04-22 1965-11-16 Hydrocarbon Research Inc Liquefaction of air
US3270514A (en) * 1963-04-23 1966-09-06 Gas Equipment Engineering Corp Separation of gas mixtures
US3348385A (en) * 1964-12-23 1967-10-24 Gas Equipment Engineering Corp Separation of gas mixtures
GB1180904A (en) * 1966-06-01 1970-02-11 British Oxygen Co Ltd Air Separation Process.
US3375673A (en) * 1966-06-22 1968-04-02 Hydrocarbon Research Inc Air separation process employing work expansion of high and low pressure nitrogen
FR2064440B1 (no) * 1969-10-20 1973-11-23 Kobe Steel Ltd
GB1576910A (en) * 1978-05-12 1980-10-15 Air Prod & Chem Process and apparatus for producing gaseous nitrogen

Also Published As

Publication number Publication date
DK161084C (da) 1991-11-18
NL8304118A (nl) 1984-07-02
DK161084B (da) 1991-05-27
DK551983D0 (da) 1983-12-01
DK551983A (da) 1984-06-03
CA1210315A (en) 1986-08-26
GB8332133D0 (en) 1984-01-11
US4453957A (en) 1984-06-12
NO162258B (no) 1989-08-21
GB2131147A (en) 1984-06-13
GB2131147B (en) 1986-05-08

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