NL7508637A - OXIDATION CATALYSTS. - Google Patents

OXIDATION CATALYSTS.

Info

Publication number
NL7508637A
NL7508637A NL7508637A NL7508637A NL7508637A NL 7508637 A NL7508637 A NL 7508637A NL 7508637 A NL7508637 A NL 7508637A NL 7508637 A NL7508637 A NL 7508637A NL 7508637 A NL7508637 A NL 7508637A
Authority
NL
Netherlands
Prior art keywords
oxidation catalysts
catalysts
oxidation
Prior art date
Application number
NL7508637A
Other languages
Dutch (nl)
Other versions
NL188016B (en
Original Assignee
Standard Oil Co Ohio
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
Application filed by Standard Oil Co Ohio filed Critical Standard Oil Co Ohio
Publication of NL7508637A publication Critical patent/NL7508637A/en
Publication of NL188016B publication Critical patent/NL188016B/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
    • B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/84—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • B01J23/85—Chromium, molybdenum or tungsten
    • B01J23/88—Molybdenum
    • B01J23/887—Molybdenum containing in addition other metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/002—Mixed oxides other than spinels, e.g. perovskite
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
    • B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/84—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • B01J23/85—Chromium, molybdenum or tungsten
    • B01J23/88—Molybdenum
    • B01J23/887—Molybdenum containing in addition other metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/8876—Arsenic, antimony or bismuth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
    • B01J27/02—Sulfur, selenium or tellurium; Compounds thereof
    • B01J27/057—Selenium or tellurium; Compounds thereof
    • B01J27/0576—Tellurium; Compounds thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
    • B01J27/14—Phosphorus; Compounds thereof
    • B01J27/186—Phosphorus; Compounds thereof with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
    • B01J27/14—Phosphorus; Compounds thereof
    • B01J27/186—Phosphorus; Compounds thereof with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • B01J27/188—Phosphorus; Compounds thereof with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium with chromium, molybdenum, tungsten or polonium
    • B01J27/19—Molybdenum
    • B01J27/192—Molybdenum with bismuth
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C253/00—Preparation of carboxylic acid nitriles
    • C07C253/24—Preparation of carboxylic acid nitriles by ammoxidation of hydrocarbons or substituted hydrocarbons
    • C07C253/26—Preparation of carboxylic acid nitriles by ammoxidation of hydrocarbons or substituted hydrocarbons containing carbon-to-carbon multiple bonds, e.g. unsaturated aldehydes
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
    • C07C45/27—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation
    • C07C45/32—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen
    • C07C45/33—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen of CHx-moieties
    • C07C45/34—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen of CHx-moieties in unsaturated compounds
    • C07C45/35—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen of CHx-moieties in unsaturated compounds in propene or isobutene
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C5/00—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms
    • C07C5/42—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by dehydrogenation with a hydrogen acceptor
    • C07C5/48—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by dehydrogenation with a hydrogen acceptor with oxygen as an acceptor
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/16—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
    • C07C51/21—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen
    • C07C51/25—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of unsaturated compounds containing no six-membered aromatic ring
    • C07C51/252—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of unsaturated compounds containing no six-membered aromatic ring of propene, butenes, acrolein or methacrolein
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2523/00—Constitutive chemical elements of heterogeneous catalysts
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals
    • Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Catalysts (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
NLAANVRAGE7508637,A 1974-07-22 1975-07-18 METHOD FOR PREPARING OXIDIZATION CATALYSTS CONTAINING IRON, BISMUT, MOLYBDENES AND OXYGEN NL188016B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US49053274A 1974-07-22 1974-07-22

Publications (2)

Publication Number Publication Date
NL7508637A true NL7508637A (en) 1976-01-26
NL188016B NL188016B (en) 1991-10-16

Family

ID=23948462

Family Applications (1)

Application Number Title Priority Date Filing Date
NLAANVRAGE7508637,A NL188016B (en) 1974-07-22 1975-07-18 METHOD FOR PREPARING OXIDIZATION CATALYSTS CONTAINING IRON, BISMUT, MOLYBDENES AND OXYGEN

Country Status (19)

Country Link
JP (2) JPS6036812B2 (en)
AT (1) AT354408B (en)
BE (1) BE831530A (en)
BR (1) BR7504680A (en)
CA (1) CA1075672A (en)
CH (1) CH616861A5 (en)
CS (1) CS195708B2 (en)
DD (1) DD122065A5 (en)
DE (1) DE2530959C2 (en)
EG (1) EG12556A (en)
ES (1) ES439592A1 (en)
FR (1) FR2279465A1 (en)
GB (1) GB1523772A (en)
IN (1) IN144016B (en)
IT (1) IT1039883B (en)
NL (1) NL188016B (en)
NO (1) NO145184C (en)
RO (1) RO70128A (en)
YU (1) YU37273B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0000663A1 (en) * 1977-07-28 1979-02-07 The Standard Oil Company Process for the oxidation of olefins using molybdenum containing catalysts containing various promoter elements
EP0000564A1 (en) * 1977-07-28 1979-02-07 The Standard Oil Company Catalysts containing iron and molybdenum and the use of these catalysts in the preparation of acrylonitrile or methacrylonitrile

Families Citing this family (57)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL175175C (en) * 1970-10-30 1984-10-01 Standard Oil Co Ohio PROCESS FOR CONVERTING PROPENE AND / OR ISOBUTENE WITH A MOLECULAR OXYGEN-CONTAINING GAS AND AMMONIA IN THE PRESENCE OF A CATALYST.
GB1523772A (en) * 1974-07-22 1978-09-06 Standard Oil Co Oxidation catalysts
JPS51113807A (en) * 1975-03-31 1976-10-07 Mitsubishi Rayon Co Ltd Process for preparation of methacrolein and methacrylic acid and or 1, 3-butadiene
JPS527904A (en) * 1975-07-04 1977-01-21 Mitsubishi Rayon Co Ltd Process for preparation of methacrolein, methacrylic acid or 1,3-butad iene
US4118419A (en) * 1975-12-03 1978-10-03 Mitsubishi Rayon Company, Ltd. Catalytic process for the preparation of an unsaturated carboxylic acid
JPS5353613A (en) * 1976-10-26 1978-05-16 Nippon Zeon Co Ltd Preparation of methacrylic acid
CA1127137A (en) * 1977-12-20 1982-07-06 Dev D. Suresh Ammoxidation of olefins with novel antimonate catalysts
JPS5416409A (en) * 1978-06-26 1979-02-07 Mitsubishi Rayon Co Ltd Preparation of 1,3-futadiene
JPS5416410A (en) * 1978-06-26 1979-02-07 Mitsubishi Rayon Co Ltd Preparation of methacrolein, methacrylic acid and 1,3-butadiene
JPS5517306A (en) * 1978-07-20 1980-02-06 Standard Oil Co Olefin oxidation using catalyst containing various promoter elements
JPS5538330A (en) * 1978-09-13 1980-03-17 Ube Ind Ltd Preparation of acrylonitrile
DE2841712A1 (en) * 1978-09-25 1980-04-10 Basf Ag PROCESS FOR THE PREPARATION OF P-SUBSTITUTED BENZALDEHYDE
JPS6122040A (en) * 1984-07-10 1986-01-30 Mitsubishi Rayon Co Ltd Production of methacrolein and methacrylic acid
JPS6338417A (en) * 1986-08-01 1988-02-19 松下電器産業株式会社 Rice cooker
JPH04136537A (en) * 1990-09-26 1992-05-11 Kobe Steel Ltd Vibration control device for structure
JPH04140530A (en) * 1990-09-28 1992-05-14 Kobe Steel Ltd Vibration damping device for structure
JPH04133043U (en) * 1991-06-03 1992-12-10 富士ポリマテツク株式会社 Variable spring constant dynamic vibration damper
DE4200248A1 (en) * 1992-01-08 1993-07-15 Basf Ag METHOD FOR REGENERATING METAL OXIDE CATALYSTS
JPH05302643A (en) * 1992-04-15 1993-11-16 Kobe Steel Ltd Floor panel for housing
KR100186659B1 (en) * 1994-06-22 1999-05-15 유미꾸라 레이이찌 Process for producing methacrolein
US6136998A (en) * 1996-10-15 2000-10-24 Mitsubishi Rayon Co., Ltd. Retention of activity of molybdenum-containing metallic oxide catalyst
FR2756499B1 (en) * 1996-12-03 1999-01-22 Atochem Elf Sa CATALYTIC SYSTEM IN PARTICULAR FOR THE HOUSEHOLD AND SELECTIVE OXIDATION OF ALKANES IN ALKENES AND UNSATURATED ALDEHYDES
DE19957416A1 (en) * 1999-11-29 2001-06-13 Aventis Res & Tech Gmbh & Co Process for the catalytic production of halobenzaldehydes and catalysts for carrying out the process
DE10137534A1 (en) 2001-08-01 2003-02-13 Basf Ag Maleic anhydride production useful as an intermediate in the production of e.g. gamma-butyrolactone, comprises the heterogeneous catalyzed gas phase oxidation of n-butene
JP4030740B2 (en) 2001-10-11 2008-01-09 ダイヤニトリックス株式会社 Method for producing ammoxidation catalyst
JP4503444B2 (en) * 2004-02-05 2010-07-14 ダイヤニトリックス株式会社 Catalyst for producing acrylonitrile and method for producing acrylonitrile
DE102007003076A1 (en) * 2007-01-16 2008-07-17 Basf Se Process for the preparation of a multielement oxide composition containing the element iron in oxidic form
JP2008267759A (en) * 2007-04-25 2008-11-06 Dainichi Co Ltd Humidifier
CA2685679A1 (en) * 2007-05-03 2008-11-13 Shell Internationale Research Maatschappij B.V. A catalyst, its preparation and use
CA2685692A1 (en) * 2007-05-03 2008-11-13 Shell Internationale Research Maatschappij B.V. A catalyst, its preparation and use
WO2014086768A1 (en) 2012-12-06 2014-06-12 Basf Se Method for oxidative dehydrogenation of n-butenes to butadiene
US9399606B2 (en) 2012-12-06 2016-07-26 Basf Se Catalyst and process for the oxidative dehydrogenation of N-butenes to butadiene
US10144681B2 (en) 2013-01-15 2018-12-04 Basf Se Process for the oxidative dehydrogenation of N-butenes to butadiene
KR20150105456A (en) 2013-01-15 2015-09-16 바스프 에스이 Method for producing 1,3-butadiene from n-butenes by oxidative dehydrogenation
KR20150105455A (en) 2013-01-16 2015-09-16 바스프 에스이 Method for producing butadiene by oxidative dehydrogenation of n-butenes by monitoring the peroxide-content during product processing
WO2015004042A2 (en) 2013-07-10 2015-01-15 Basf Se Method for the oxidative dehydrogenation of n-butenes to butadiene
EA201690893A1 (en) 2013-10-30 2016-10-31 Басф Се METHOD OF OBTAINING 1,3-BUTADIENE FROM H-BUTENES THROUGH OXIDATIVE DEGYDERATION
WO2015104397A1 (en) 2014-01-13 2015-07-16 Basf Se Method of starting up a reactor for the oxidative dehydrogenation of n-butenes
DE102014203725A1 (en) 2014-02-28 2015-09-03 Basf Se Oxidation catalyst with saddle-shaped carrier shaped body
JP2017524011A (en) 2014-08-12 2017-08-24 ビーエーエスエフ ソシエタス・ヨーロピアＢａｓｆ Ｓｅ Process for producing 1,3-butadiene from n-butenes by oxidative dehydrogenation
JP6608916B2 (en) 2014-09-26 2019-11-20 ビーエーエスエフ ソシエタス・ヨーロピア Process for producing 1,3-butadiene from n-butenes by oxidative dehydrogenation
KR20170080642A (en) 2014-11-03 2017-07-10 바스프 에스이 Process for preparing 1,3-butadiene from n-butenes by oxidative dehydrogenation
WO2016075065A1 (en) 2014-11-14 2016-05-19 Basf Se Method for producing 1,3-butadiene by dehydrogenating n-butenes, a material flow containing butanes and 2-butenes being provided
WO2016150940A1 (en) 2015-03-26 2016-09-29 Basf Se Process for preparing 1,3-butadiene from n-butenes by oxidative dehydrogenation
WO2016151074A1 (en) 2015-03-26 2016-09-29 Basf Se Method for preparing 1,3-butadiene from n-butenes by oxidative dehydrogenation
US20180072638A1 (en) 2015-03-26 2018-03-15 Basf Se Process for preparing 1,3-butadiene from n-butenes by oxidative dehydrogenation
EP3274320B1 (en) 2015-03-26 2019-02-27 Basf Se Method for preparing 1.3-butadiene from n-butenes by oxidative dehydrogenation
EP3383831B1 (en) 2015-12-03 2019-10-23 Basf Se Method for preparing butadiene through the oxidative dehydration of n-butenes
WO2017121739A1 (en) 2016-01-13 2017-07-20 Basf Se Method for preparing 1,3-butadiene from n-butenes by oxidative dehydrogenation
US10647639B2 (en) 2016-02-04 2020-05-12 Basf Se Method for preparing 1,3-butadiene from N-butenes by oxidative dehydrogeneation
JP2019528264A (en) 2016-08-09 2019-10-10 ビーエーエスエフ ソシエタス・ヨーロピアＢａｓｆ Ｓｅ Method for starting a reactor for oxidative dehydrogenation of n-butene
WO2018095856A1 (en) 2016-11-22 2018-05-31 Basf Se Method for preparing 1,3-butadiene from n-butenes through oxidative dehydrogenation comprising methacrolein removal during processing
WO2018095840A1 (en) 2016-11-22 2018-05-31 Basf Se Method for producing 1,3-butadiene from n-butenes by oxidative dehydrogenation, comprising furan removal in the processing
WO2018095776A1 (en) 2016-11-22 2018-05-31 Basf Se Method for producing 1,3-butadiene from n-butenes by oxidative dehydrogenation, comprising aqueous scrubbing of the c4 product gas flow
EP3323797A1 (en) 2016-11-22 2018-05-23 Basf Se Method for preparing 1,3-butadiene from n-butenes by oxidative dehydrogenation comprising an acidic washing of a c4 product gas flow
WO2018219996A1 (en) 2017-06-02 2018-12-06 Basf Se Process for preparing 1,3-butadiene from n-butenes by oxidative dehydrogenation in recycle gas mode with co2-enriched recycle gas
WO2018234158A1 (en) 2017-06-19 2018-12-27 Basf Se Method for producing 1,3-butadiene from n-butenes by means of oxidative dehydrogenation, including a scrubbing of the c4 product gas flow

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EG12556A (en) 1979-09-30
JPS6242654B2 (en) 1987-09-09
DD122065A5 (en) 1976-09-12
JPS6118435A (en) 1986-01-27
YU37273B (en) 1984-08-31
DE2530959A1 (en) 1976-02-05
JPS5140391A (en) 1976-04-05
ES439592A1 (en) 1977-06-01
JPS6036812B2 (en) 1985-08-22
NO145184C (en) 1982-02-03
DE2530959C2 (en) 1986-03-20
IN144016B (en) 1978-03-11
CA1075672A (en) 1980-04-15
RO70128A (en) 1982-10-11
CS195708B2 (en) 1980-02-29
AT354408B (en) 1979-01-10
FR2279465A1 (en) 1976-02-20
FR2279465B1 (en) 1981-08-28
ATA544975A (en) 1979-06-15
BE831530A (en) 1975-11-17
YU186375A (en) 1983-04-27
BR7504680A (en) 1976-07-06
IT1039883B (en) 1979-12-10
NL188016B (en) 1991-10-16
NO752572L (en) 1976-01-23
CH616861A5 (en) 1980-04-30
GB1523772A (en) 1978-09-06
NO145184B (en) 1981-10-26

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