ES2110958T3 - Separacion de gases por medio de membranas adsorbentes. - Google Patents
Separacion de gases por medio de membranas adsorbentes.Info
- Publication number
- ES2110958T3 ES2110958T3 ES90121320T ES90121320T ES2110958T3 ES 2110958 T3 ES2110958 T3 ES 2110958T3 ES 90121320 T ES90121320 T ES 90121320T ES 90121320 T ES90121320 T ES 90121320T ES 2110958 T3 ES2110958 T3 ES 2110958T3
- Authority
- ES
- Spain
- Prior art keywords
- gases
- separation
- separation process
- membranes
- components
- Prior art date
- 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.)
- Expired - Lifetime
Links
- 239000012528 membrane Substances 0.000 title abstract 4
- 238000000926 separation method Methods 0.000 title abstract 3
- 239000007789 gas Substances 0.000 title abstract 2
- 239000003463 adsorbent Substances 0.000 title 1
- 238000010521 absorption reaction Methods 0.000 abstract 3
- 239000002131 composite material Substances 0.000 abstract 2
- 239000000463 material Substances 0.000 abstract 2
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- 239000000758 substrate Substances 0.000 abstract 1
- 230000002459 sustained effect Effects 0.000 abstract 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0081—After-treatment of organic or inorganic membranes
- B01D67/0088—Physical treatment with compounds, e.g. swelling, coating or impregnation
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B9/00—Simulators for teaching or training purposes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
- B01D53/228—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion characterised by specific membranes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
- B01D53/229—Integrated processes (Diffusion and at least one other process, e.g. adsorption, absorption)
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0039—Inorganic membrane manufacture
- B01D67/0072—Inorganic membrane manufacture by deposition from the gaseous phase, e.g. sputtering, CVD, PVD
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/10—Supported membranes; Membrane supports
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/10—Supported membranes; Membrane supports
- B01D69/108—Inorganic support material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/12—Composite membranes; Ultra-thin membranes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/12—Composite membranes; Ultra-thin membranes
- B01D69/1213—Laminated layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/14—Dynamic membranes
- B01D69/141—Heterogeneous membranes, e.g. containing dispersed material; Mixed matrix membranes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/14—Dynamic membranes
- B01D69/141—Heterogeneous membranes, e.g. containing dispersed material; Mixed matrix membranes
- B01D69/147—Heterogeneous membranes, e.g. containing dispersed material; Mixed matrix membranes containing embedded adsorbents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/02—Inorganic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/02—Inorganic material
- B01D71/028—Molecular sieves
- B01D71/0281—Zeolites
-
- 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
- C10G70/00—Working-up undefined normally gaseous mixtures obtained by processes covered by groups C10G9/00, C10G11/00, C10G15/00, C10G47/00, C10G51/00
- C10G70/04—Working-up undefined normally gaseous mixtures obtained by processes covered by groups C10G9/00, C10G11/00, C10G15/00, C10G47/00, C10G51/00 by physical processes
- C10G70/045—Working-up undefined normally gaseous mixtures obtained by processes covered by groups C10G9/00, C10G11/00, C10G15/00, C10G47/00, C10G51/00 by physical processes using membranes, e.g. selective permeation
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B9/00—Simulators for teaching or training purposes
- G09B9/003—Simulators for teaching or training purposes for military purposes and tactics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2256/00—Main component in the product gas stream after treatment
- B01D2256/16—Hydrogen
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2256/00—Main component in the product gas stream after treatment
- B01D2256/24—Hydrocarbons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2323/00—Details relating to membrane preparation
- B01D2323/08—Specific temperatures applied
- B01D2323/081—Heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2323/00—Details relating to membrane preparation
- B01D2323/08—Specific temperatures applied
- B01D2323/082—Cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2323/00—Details relating to membrane preparation
- B01D2323/15—Use of additives
- B01D2323/218—Additive materials
- B01D2323/2181—Inorganic additives
- B01D2323/21813—Metal oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/02—Details relating to pores or porosity of the membranes
- B01D2325/0283—Pore size
- B01D2325/02833—Pore size more than 10 and up to 100 nm
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/04—Characteristic thickness
-
- 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
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Theoretical Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Educational Technology (AREA)
- General Physics & Mathematics (AREA)
- Educational Administration (AREA)
- Physics & Mathematics (AREA)
- Business, Economics & Management (AREA)
- Manufacturing & Machinery (AREA)
- Dispersion Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
SE EXPONE UN COMPUESTO DE MEMBRANAS SEMIPERMEABLES QUE COMPRENDEN UN MATERIAL DE ABSORCION POROSO SOSTENIDO POR UN SUSTRATO POROSO, PARA UTILIZACION EN UN PROCESO PARA LA SEPARACION DE MEZCLAS DE GASES MULTICOMPONENTES. EN EL PROCESO DE SEPARACION, UNO O MAS COMPONENTES PRIMARIOS DE ABSORCION DENTRO DE LOS POROS DEL MATERIAL DE ABSORCION Y SE DIFUMINAN MEDIANTE EL FLUJO DE LA SUPERFICIE A TRAVES DE LA MEMBRANA PARA PRODUCIR UNA CORRIENTE PERMEABLE ENRIQUECIDA EN UNO O MAS COMPONENTES PRIMARIOS. SE DESCRIBEN LOS METODOS PARA FABRICAR LAS MEMBRANAS COMPUESTAS .
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US43656689A | 1989-11-14 | 1989-11-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ES2110958T3 true ES2110958T3 (es) | 1998-03-01 |
Family
ID=23732930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES90121320T Expired - Lifetime ES2110958T3 (es) | 1989-11-14 | 1990-11-07 | Separacion de gases por medio de membranas adsorbentes. |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0428052B1 (es) |
| KR (1) | KR930001603B1 (es) |
| CA (1) | CA2029484C (es) |
| DE (1) | DE69031973T2 (es) |
| ES (1) | ES2110958T3 (es) |
| MY (1) | MY104776A (es) |
Families Citing this family (29)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4107089A1 (de) * | 1991-03-06 | 1992-09-10 | Deutsche Forsch Luft Raumfahrt | Verfahren und vorrichtung zum trennen und transportieren von gasen und/oder von durch dissoziation an oberflaechen entstandenen gasmolekuel-bruchstuecken durch oberflaechendiffusion |
| JPH05105420A (ja) * | 1991-03-29 | 1993-04-27 | Ngk Insulators Ltd | ゼオライト結晶体の合成膜およびその製造方法 |
| DE4117284A1 (de) * | 1991-05-27 | 1992-12-03 | Studiengesellschaft Kohle Mbh | Verfahren zur herstellung von mikroporoesen keramikmembranen fuer die trennung von gas- und fluessigkeitsgemischen |
| TW242120B (es) * | 1992-06-24 | 1995-03-01 | Air Prod & Chem | |
| IL105442A (en) * | 1993-04-19 | 1996-01-19 | Carbon Membranes Ltd | Method for the separation of gases at low temperatures |
| EP0711202B1 (en) * | 1993-07-27 | 1999-12-22 | The University Of Arizona | Reactive membrane for filtration and purification of gases of impurities and method utilizing the same |
| US5332424A (en) * | 1993-07-28 | 1994-07-26 | Air Products And Chemicals, Inc. | Hydrocarbon fractionation by adsorbent membranes |
| WO1996034677A1 (en) * | 1995-05-03 | 1996-11-07 | Pall Corporation | Devices and methods related to the filtration and/or purification of fluids |
| US5634354A (en) * | 1996-05-08 | 1997-06-03 | Air Products And Chemicals, Inc. | Olefin recovery from olefin-hydrogen mixtures |
| US5897915A (en) * | 1996-10-28 | 1999-04-27 | Corning Incorporated | Coated substrates, method for producing same, and use therefor |
| ES2151781B1 (es) * | 1997-05-14 | 2001-08-16 | Consejo Superior Investigacion | Procedimiento para la preparacion de membranas de carbono. |
| ES2151815B1 (es) * | 1998-05-18 | 2001-08-16 | Consejo Superior Investigacion | Procedimiento para la preparacion de membranas de carbono para la separacion de gases permanentes. |
| DE19849216A1 (de) | 1998-10-26 | 2000-04-27 | Andreas Noack | Verfahren und Vorrichtung zur Trennung von Fluidgemischen (Thermomembranverfahren) |
| ES2155381B1 (es) * | 1999-04-15 | 2001-12-01 | Consejo Superior Investigacion | Procedimiento para la preparacion de membranas de carbono para la separacion de gases. |
| US7465692B1 (en) | 2000-03-16 | 2008-12-16 | Pall Corporation | Reactive media, methods of use and assemblies for purifying |
| EP1292380B1 (en) | 2000-06-22 | 2005-12-28 | E.I. Dupont De Nemours And Company | Mixed matrix nanoporous carbon membranes |
| DE10051910A1 (de) | 2000-10-19 | 2002-05-02 | Membrana Mundi Gmbh | Flexible, poröse Membranen und Adsorbentien, und Verfahren zu deren Herstellung |
| KR100466250B1 (ko) * | 2002-09-30 | 2005-01-14 | 한국과학기술원 | 다양한 형태의 콜로이드 결정 및 다공성 구조체의 제조방법 |
| DE102006034601B3 (de) | 2006-07-26 | 2008-02-07 | Schmidt, Klaus, Prof. Dr. | Rückhaltung von Edelgasen im Atemgas bei beatmeten Patienten mit Hilfe von Membranseparation |
| US8118914B2 (en) * | 2008-09-05 | 2012-02-21 | Alstom Technology Ltd. | Solid materials and method for CO2 removal from gas stream |
| WO2014094139A1 (en) | 2012-12-22 | 2014-06-26 | Dmf Medical Incorporated | An anesthetic circuit having a hollow fiber membrane |
| KR101634653B1 (ko) * | 2014-03-26 | 2016-06-29 | 국방과학연구소 | 분석대상가스 농축용 흡착제 및 제조방법, 분석대상가스의 검출방법 |
| US10086337B2 (en) | 2014-11-30 | 2018-10-02 | L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Composite carbon molecular sieve membranes having anti-substructure collapse particles loaded in a core thereof |
| RU2596257C1 (ru) * | 2015-04-29 | 2016-09-10 | Открытое акционерное общество "Нефтяная компания "Роснефть" | Способ фракционирования смесей низкомолекулярных углеводородов с использованием капиллярной конденсации на микропористых мембранах |
| TWI746476B (zh) * | 2015-11-13 | 2021-11-21 | 美商艾克頌美孚硏究工程公司 | 混合之二甲苯的分離 |
| JP7074679B2 (ja) * | 2016-03-16 | 2022-05-24 | ダウ グローバル テクノロジーズ エルエルシー | 炭化塩化ビニリデンコポリマーガス分離膜を介するガスの分離及び膜の調製のためのプロセス |
| US12036518B2 (en) * | 2019-01-25 | 2024-07-16 | Dow Global Technologies Llc | Carbon molecular sieve membrane produced from a carbon forming polymer-polyvinylidene chloride copolymer blend |
| CN114370596B (zh) * | 2021-12-08 | 2023-07-14 | 中国航空工业集团公司北京长城计量测试技术研究所 | 一种提升碱金属纯度的气室及实现方法 |
| CN114956057B (zh) * | 2022-06-24 | 2023-07-04 | 闪速优科(深圳)新材料有限公司 | 一种柔性石墨烯薄膜的制备方法 |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2924630A (en) * | 1957-06-28 | 1960-02-09 | Union Oil Co | Fluid diffusion fractionation |
| NL126633C (es) * | 1958-02-24 | 1900-01-01 | ||
| FR2079460A5 (en) * | 1970-02-02 | 1971-11-12 | Rhone Poulenc Sa | Polyorganosiloxane elastomer membranes - contng zeolite for gaseous separation procedures in conventional appts |
| US4230463A (en) * | 1977-09-13 | 1980-10-28 | Monsanto Company | Multicomponent membranes for gas separations |
| JPS585688B2 (ja) * | 1979-03-09 | 1983-02-01 | 若尾 法昭 | クヌッセン細孔拡散膜の移動式ガス混合物成分濃縮装置 |
| JPS6028826A (ja) * | 1983-07-26 | 1985-02-14 | Hiroshi Suzuki | かご型ゼオライト薄膜表層を有する複合膜及びその製造法 |
| US4685940A (en) * | 1984-03-12 | 1987-08-11 | Abraham Soffer | Separation device |
| JPH0628706B2 (ja) * | 1984-10-30 | 1994-04-20 | 宏志 鈴木 | ゼオライト,層間利用化合物又は結晶格子間利用化合物を多孔質支持体の細孔内に保有する複合体及びその製造法 |
| JPH0824815B2 (ja) * | 1987-08-21 | 1996-03-13 | 住友精化株式会社 | ガスの分離方法 |
| FR2625690B1 (fr) * | 1988-01-11 | 1993-04-23 | Inst Francais Du Petrole | Procede de separation des constituants d'un melange en phase gazeuse au moyen d'une membrane composite |
-
1990
- 1990-11-07 CA CA002029484A patent/CA2029484C/en not_active Expired - Fee Related
- 1990-11-07 DE DE69031973T patent/DE69031973T2/de not_active Expired - Fee Related
- 1990-11-07 EP EP90121320A patent/EP0428052B1/en not_active Expired - Lifetime
- 1990-11-07 ES ES90121320T patent/ES2110958T3/es not_active Expired - Lifetime
- 1990-11-12 MY MYPI90001989A patent/MY104776A/en unknown
- 1990-11-13 KR KR1019900018307A patent/KR930001603B1/ko not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE69031973T2 (de) | 1998-04-30 |
| CA2029484C (en) | 1999-04-27 |
| CA2029484A1 (en) | 1991-05-15 |
| KR930001603B1 (ko) | 1993-03-06 |
| EP0428052A3 (en) | 1991-09-11 |
| MY104776A (en) | 1994-05-31 |
| KR910009328A (ko) | 1991-06-28 |
| EP0428052A2 (en) | 1991-05-22 |
| DE69031973D1 (de) | 1998-02-26 |
| EP0428052B1 (en) | 1998-01-21 |
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