NO880812L - Fremstilling av zeolitt l. - Google Patents

Fremstilling av zeolitt l.

Info

Publication number
NO880812L
NO880812L NO88880812A NO880812A NO880812L NO 880812 L NO880812 L NO 880812L NO 88880812 A NO88880812 A NO 88880812A NO 880812 A NO880812 A NO 880812A NO 880812 L NO880812 L NO 880812L
Authority
NO
Norway
Prior art keywords
zeolitt
preparation
Prior art date
Application number
NO88880812A
Other languages
English (en)
Other versions
NO175300C (no
NO880812D0 (no
NO175300B (no
Inventor
Johannes Petrus Verduijn
Pieter Ernst Gellings
Original Assignee
Exxon Chemical Patents Inc
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 Exxon Chemical Patents Inc filed Critical Exxon Chemical Patents Inc
Publication of NO880812D0 publication Critical patent/NO880812D0/no
Publication of NO880812L publication Critical patent/NO880812L/no
Publication of NO175300B publication Critical patent/NO175300B/no
Publication of NO175300C publication Critical patent/NO175300C/no

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
    • B01J29/00—Catalysts comprising molecular sieves
    • B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
    • B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • B01J29/60—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the type L, as exemplified by patent document US3216789
    • 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
    • B01J29/00—Catalysts comprising molecular sieves
    • B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
    • B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • B01J29/60—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the type L, as exemplified by patent document US3216789
    • B01J29/61—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the type L, as exemplified by patent document US3216789 containing iron group metals, noble metals or copper
    • B01J29/62—Noble metals
    • 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
    • B01J29/00—Catalysts comprising molecular sieves
    • B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
    • B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • B01J29/70—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65
    • B01J29/7011—MAZ-type, e.g. Mazzite, Omega, ZSM-4 or LZ-202
    • 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
    • B01J29/00—Catalysts comprising molecular sieves
    • B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
    • B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • B01J29/80—Mixtures of different zeolites
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B39/00—Compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites; Their preparation; After-treatment, e.g. ion-exchange or dealumination
    • C01B39/02—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof; Direct preparation thereof; Preparation thereof starting from a reaction mixture containing a crystalline zeolite of another type, or from preformed reactants; After-treatment thereof
    • C01B39/32—Type L
    • 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
    • C07C5/22—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by isomerisation
    • C07C5/2206—Catalytic processes not covered by C07C5/23 - C07C5/31
    • C07C5/226—Catalytic processes not covered by C07C5/23 - C07C5/31 with metals
    • 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
    • C07C5/32—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by dehydrogenation with formation of free hydrogen
    • C07C5/373—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by dehydrogenation with formation of free hydrogen with simultaneous isomerisation
    • C07C5/393—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by dehydrogenation with formation of free hydrogen with simultaneous isomerisation with cyclisation to an aromatic six-membered ring, e.g. dehydrogenation of n-hexane to benzene
    • C07C5/41—Catalytic processes
    • C07C5/415—Catalytic processes with metals
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G35/00—Reforming naphtha
    • C10G35/04—Catalytic reforming
    • C10G35/06—Catalytic reforming characterised by the catalyst used
    • C10G35/095—Catalytic reforming characterised by the catalyst used containing crystalline alumino-silicates, e.g. molecular sieves
    • 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
    • B01J2229/00—Aspects of molecular sieve catalysts not covered by B01J29/00
    • B01J2229/10—After treatment, characterised by the effect to be obtained
    • B01J2229/26—After treatment, characterised by the effect to be obtained to stabilize the total catalyst structure
    • 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
    • B01J2229/00—Aspects of molecular sieve catalysts not covered by B01J29/00
    • B01J2229/30—After treatment, characterised by the means used
    • B01J2229/42—Addition of matrix or binder particles
    • 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
    • B01J29/00—Catalysts comprising molecular sieves
    • B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
    • B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • B01J29/50—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the erionite or offretite type, e.g. zeolite T, as exemplified by patent document US2950952
    • 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
    • B01J29/00—Catalysts comprising molecular sieves
    • B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
    • B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • B01J29/70—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2529/00—Catalysts comprising molecular sieves
    • C07C2529/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites, pillared clays
    • C07C2529/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • C07C2529/60—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the type L
    • C07C2529/61—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the type L containing iron group metals, noble metals or copper
    • 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
    • Y10S423/00—Chemistry of inorganic compounds
    • Y10S423/28—LTL, e.g. BA-G, L, AG-1, AG-2, AG-4, BA-6

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Catalysts (AREA)
  • Silicates, Zeolites, And Molecular Sieves (AREA)
  • Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
NO880812A 1987-02-25 1988-02-24 Fremgangsmåte for fremstilling av zeolitt L partikler inneholdende små mengder ikke-zeolittisk bindemiddel, zeolitt L partikler samt katalysator inneholdende disse NO175300C (no)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB878704365A GB8704365D0 (en) 1987-02-25 1987-02-25 Zeolite l preparation

Publications (4)

Publication Number Publication Date
NO880812D0 NO880812D0 (no) 1988-02-24
NO880812L true NO880812L (no) 1988-08-26
NO175300B NO175300B (no) 1994-06-20
NO175300C NO175300C (no) 1994-10-05

Family

ID=10612879

Family Applications (1)

Application Number Title Priority Date Filing Date
NO880812A NO175300C (no) 1987-02-25 1988-02-24 Fremgangsmåte for fremstilling av zeolitt L partikler inneholdende små mengder ikke-zeolittisk bindemiddel, zeolitt L partikler samt katalysator inneholdende disse

Country Status (14)

Country Link
US (4) US5486348A (no)
EP (1) EP0284206B1 (no)
JP (1) JP2547813B2 (no)
AR (1) AR245426A1 (no)
AT (1) ATE72660T1 (no)
AU (2) AU597796B2 (no)
BR (1) BR8800775A (no)
CA (1) CA1327561C (no)
DE (1) DE3868420D1 (no)
EG (1) EG18582A (no)
ES (1) ES2032011T3 (no)
GB (1) GB8704365D0 (no)
MX (1) MX169203B (no)
NO (1) NO175300C (no)

Families Citing this family (45)

* Cited by examiner, † Cited by third party
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GB8704365D0 (en) * 1987-02-25 1987-04-01 Exxon Chemical Patents Inc Zeolite l preparation
DE3850946T2 (de) * 1987-12-15 1994-12-01 Uop Inc Ersatz von Aluminium durch Chrom und/oder Zinn im Gerüst eines Molekularsiebes mittels einer Behandlung mit Fluoridsalzen.
GB8801067D0 (en) * 1988-01-19 1988-02-17 Exxon Chemical Patents Inc Zeolite l preparation
GB8924410D0 (en) * 1989-10-30 1989-12-20 Exxon Chemical Patents Inc Zeolite l
GB9101456D0 (en) * 1991-01-23 1991-03-06 Exxon Chemical Patents Inc Process for producing substantially binder-free zeolite
FI952954A0 (fi) * 1992-12-16 1995-06-15 Chevron Res & Tech Alumosilikaattizeoliittien valmistus
DE69511575T2 (de) 1994-11-23 2000-04-27 Exxon Chemical Patents, Inc. Verfahren zur umwandlung von kohlenwasserstoffen unter verwendung eines durch zeolith gebundenen zeolithkatalysators
MX9701814A (es) 1995-07-10 1997-11-29 Exxon Chemical Patents Inc Zeolitas y procesos para su fabricacion.
BR9709381A (pt) 1996-05-29 1999-08-10 Exxon Chemical Patents Inc Processos de convers o aromática e catalisador de zeólito útil nos mesmos
ID18446A (id) * 1996-05-29 1998-04-09 Exxon Chemical Patents Inc Proses untuk isomerisasi hidrokarbon-hidrokarbon alkilaromatik
ZA974712B (en) 1996-05-29 1998-11-17 Exxon Chemical Patents Inc Zeolite catalyst and use for hydrocarbon conversion
BR9709622A (pt) * 1996-05-29 1999-08-10 Exxon Chemical Patents Inc Processo para produção de compostos aromáticos a partir de hidrocarbonetos alifáticos
US6040259A (en) * 1996-05-29 2000-03-21 Exxon Chemical Patents Inc. Metal-containing zeolite catalyst, preparation thereof and use for hydrocarbon conversion
US5785945A (en) * 1996-07-31 1998-07-28 Chevron Chemical Company Llc Preparation of zeolite L
US6919491B1 (en) * 1997-05-08 2005-07-19 Exxonmobil Oil Corporation Process for preparing short chain alkyl aromatic compounds
US5851379A (en) * 1997-12-22 1998-12-22 Chevron Chemical Company Reforming process using monofunctional catalyst containing bismuth
US6063724A (en) * 1998-04-06 2000-05-16 The Board Of Regents Of The University Of Oklahoma Sulfur-tolerant aromatization catalysts
ATE240266T1 (de) 1998-09-22 2003-05-15 Exxonmobil Chem Patents Inc Verfahren zur herstellung von durch zeolith gebundenen zeolithen mit hohem sio2-gehalt und ihre verwendung
US6261534B1 (en) 1999-11-24 2001-07-17 Chevron U.S.A. Inc. Method for making ZSM-5 zeolites
ATE450621T2 (de) 2000-03-30 2009-12-15 Whitehead Biomedical Inst Mediatoren von rns-interferenz, die rns- sequenzspezifisch sind
KR100872437B1 (ko) * 2000-12-01 2008-12-05 막스-플랑크-게젤샤프트 츄어 푀르더룽 데어 비쎈샤프텐 에.파우. Rna 간섭을 매개하는 작은 rna 분자
US6632415B2 (en) 2001-04-09 2003-10-14 Chevron U.S.A. Inc. Methods for making molecular sieves
US6653518B2 (en) 2001-06-15 2003-11-25 Exxonmobil Chemical Patents Inc Reforming process for manufacture of para-xylene
US20050063901A1 (en) * 2003-09-24 2005-03-24 Miller Stephen J. Preparation of molecular sieves involving spray drying
JP2006305408A (ja) * 2005-04-26 2006-11-09 Tosoh Corp 芳香族化反応触媒とその触媒を用いた芳香族炭化水素の製造方法
CN101384361A (zh) 2006-02-14 2009-03-11 埃克森美孚化学专利公司 用于制备mfs结构型分子筛的方法及其应用
CN101384366B (zh) 2006-02-14 2011-12-14 埃克森美孚化学专利公司 一种用于制造分子筛的高生产量的方法
CN101384367B (zh) 2006-02-14 2012-05-30 埃克森美孚化学专利公司 一种制造mcm-22族分子筛的方法
US7846418B2 (en) 2006-02-14 2010-12-07 Exxonmobil Chemical Patents Inc. MCM-22 family molecular sieve composition
US8859836B2 (en) 2006-02-14 2014-10-14 Exxonmobil Chemical Patents Inc. Hydrocarbon conversion process using molecular sieve of MFS framework type
WO2007094955A1 (en) 2006-02-14 2007-08-23 Exxonmobil Chemical Patents Inc. A molecular sieve composition
CN102527428B (zh) 2006-02-14 2014-11-26 埃克森美孚化学专利公司 制备分子筛组合物的方法
US7902105B2 (en) * 2007-10-11 2011-03-08 Chevron Phillips Chemical Company Lp Aromatization catalyst comprising prolongated silica and methods of making and using same
WO2009055216A2 (en) 2007-10-26 2009-04-30 Exxonmobil Chemical Patents Inc. Method of preparing a molecular sieve composition
DE102010034005A1 (de) * 2010-08-11 2012-02-16 Süd-Chemie AG Hydrothermale Synthese von Zeolithen oder zeolithähnlichen Materialien unter Verwendung von modifizierten Mischoxiden
CN102476809B (zh) * 2010-11-29 2013-08-21 中国科学院大连化学物理研究所 一种高岭土预成型制备含钡l沸石的方法
US8557028B2 (en) * 2011-03-31 2013-10-15 Uop Llc Binderless zeolitic adsorbents, methods for producing binderless zeolitic adsorbents, and adsorptive separation processes using the binderless zeolitic adsorbents
US9573122B2 (en) * 2014-08-29 2017-02-21 Chevron U.S.A. Inc. Small crystal LTL framework type zeolites
CA3022086A1 (en) 2016-04-25 2017-11-02 Exxonmobil Chemical Patents Inc. Catalytic aromatization
CN110214048B (zh) 2017-02-16 2023-06-06 埃克森美孚技术与工程公司 用于轻质链烷烃转化的固定床径流式反应器
US11186784B2 (en) * 2018-10-15 2021-11-30 Uop Llc Dehydrogenation process having improved run time
US11097257B2 (en) 2019-09-10 2021-08-24 Saudi Arabian Oil Company Catalytic hydrocarbon dehydrogenation
US11338269B2 (en) 2019-09-10 2022-05-24 Saudi Arabian Oil Company Catalytic hydrocarbon dehydrogenation
FR3123811A1 (fr) * 2021-06-11 2022-12-16 IFP Energies Nouvelles Procede de preparation d'un materiau composite a haute teneur en zeolithe kl et ayant une bonne resistance mecanique
FR3125727B1 (fr) * 2021-07-29 2025-08-01 Ifp Energies Now Procede de preparation d'un materiau zeolithique a haute teneur en zeolithe kl et de haute resistance mecanique

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DE1203238B (de) * 1964-01-04 1965-10-21 Bayer Ag Verfahren zur Herstellung von Molekularsiebformlingen
NL151957C (no) * 1964-04-13
US3650687A (en) * 1965-12-20 1972-03-21 Grace W R & Co Process for preparing binderless molecular sieve aggregates
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GB1511892A (en) * 1974-06-06 1978-05-24 Grace W R & Co Preparation of hard shaped zeolite bodies
US4381255A (en) * 1981-01-14 1983-04-26 W. R. Grace & Co. Binderless zeolite extrudates and method of producing
US4544539A (en) * 1982-05-14 1985-10-01 Exxon Research & Engineering Co. Zeolite L with cylindrical morphology
CA1236817A (en) * 1983-11-10 1988-05-17 David E.W.. Vaughan Stoichiometric process for preparing a zeolite of the l type
CA1225387A (en) * 1983-11-10 1987-08-11 David E.W. Vaughan Process for preparing type l zeolites by nucleation technique
FR2565847B1 (fr) * 1984-06-18 1986-08-29 Inst Francais Du Petrole Synthese et utilisation de zeolithes preformees
NO170924C (no) * 1984-12-17 1992-12-30 Exxon Research Engineering Co Fremgangsmaate for fremstilling av zeolitt l
NZ215949A (en) * 1985-05-08 1988-09-29 Mobil Oil Corp Production of zeolite catalyst and converting hydrocarbons to lower hydrocarbons
GB8525404D0 (en) * 1985-10-15 1985-11-20 Exxon Chemical Patents Inc Zeolite l
US5486498A (en) * 1986-10-14 1996-01-23 Exxon Research & Engineering Company Zeolite L
GB8704365D0 (en) * 1987-02-25 1987-04-01 Exxon Chemical Patents Inc Zeolite l preparation
US5491119A (en) * 1989-10-30 1996-02-13 Exxon Chemical Patents Inc. Zeolite L
GB9101456D0 (en) * 1991-01-23 1991-03-06 Exxon Chemical Patents Inc Process for producing substantially binder-free zeolite
CA2099194A1 (en) * 1992-07-08 1994-01-09 Gustavo Larsen Sulfur tolerant bimetallic zeolitic reforming catalysts
EP0681870B1 (en) * 1992-11-12 1999-07-28 Uop Multimetallic and multigradient reforming catalyst for converting paraffins to aromatics
US5523271A (en) * 1994-12-13 1996-06-04 Intevep, S.A. Catalyst for the simultaneous selective hydrogenation of diolefins and nitriles and method of making same

Also Published As

Publication number Publication date
NO175300C (no) 1994-10-05
JPS63285115A (ja) 1988-11-22
NO880812D0 (no) 1988-02-24
JP2547813B2 (ja) 1996-10-23
ES2032011T3 (es) 1993-01-01
US5624656A (en) 1997-04-29
US5919722A (en) 1999-07-06
CA1327561C (en) 1994-03-08
AU5135290A (en) 1990-07-12
AU614222B2 (en) 1991-08-22
DE3868420D1 (de) 1992-03-26
MX169203B (es) 1993-06-24
NO175300B (no) 1994-06-20
AU597796B2 (en) 1990-06-07
EG18582A (en) 1993-08-30
GB8704365D0 (en) 1987-04-01
EP0284206A1 (en) 1988-09-28
AR245426A1 (es) 1994-01-31
EP0284206B1 (en) 1992-02-19
AU1216688A (en) 1988-09-01
US5849967A (en) 1998-12-15
ATE72660T1 (de) 1992-03-15
BR8800775A (pt) 1988-10-04
US5486348A (en) 1996-01-23

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