DE3780590T2 - Gastrennung und gasreinigung. - Google Patents

Gastrennung und gasreinigung.

Info

Publication number
DE3780590T2
DE3780590T2 DE8787310920T DE3780590T DE3780590T2 DE 3780590 T2 DE3780590 T2 DE 3780590T2 DE 8787310920 T DE8787310920 T DE 8787310920T DE 3780590 T DE3780590 T DE 3780590T DE 3780590 T2 DE3780590 T2 DE 3780590T2
Authority
DE
Germany
Prior art keywords
bed
gas
layer
feed
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
Application number
DE8787310920T
Other languages
German (de)
English (en)
Other versions
DE3780590D1 (de
Inventor
Andrija Fuderer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honeywell UOP LLC
Original Assignee
UOP LLC
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 UOP LLC filed Critical UOP LLC
Application granted granted Critical
Publication of DE3780590D1 publication Critical patent/DE3780590D1/de
Publication of DE3780590T2 publication Critical patent/DE3780590T2/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B01D53/02—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 adsorption, e.g. preparative gas chromatography
    • B01D53/04—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 adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B01D53/047—Pressure swing adsorption
    • 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
    • B01D53/02—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 adsorption, e.g. preparative gas chromatography
    • B01D53/04—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 adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/102—Carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/104—Alumina
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/106—Silica or silicates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/106—Silica or silicates
    • B01D2253/108—Zeolites
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/30—Physical properties of adsorbents
    • B01D2253/302—Dimensions
    • B01D2253/304—Linear dimensions, e.g. particle shape, diameter
    • 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
    • B01D2256/10—Nitrogen
    • 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
    • B01D2256/22—Carbon dioxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/10—Single element gases other than halogens
    • B01D2257/104—Oxygen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/50—Carbon oxides
    • B01D2257/502—Carbon monoxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/50—Carbon oxides
    • B01D2257/504—Carbon dioxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • B01D2257/702—Hydrocarbons
    • B01D2257/7022—Aliphatic hydrocarbons
    • B01D2257/7025—Methane
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/40011—Methods relating to the process cycle in pressure or temperature swing adsorption
    • B01D2259/40028—Depressurization
    • B01D2259/4003—Depressurization with two sub-steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/40011—Methods relating to the process cycle in pressure or temperature swing adsorption
    • B01D2259/40028—Depressurization
    • B01D2259/40032—Depressurization with three sub-steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/40011—Methods relating to the process cycle in pressure or temperature swing adsorption
    • B01D2259/40035—Equalization
    • B01D2259/40041—Equalization with more than three sub-steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/40011—Methods relating to the process cycle in pressure or temperature swing adsorption
    • B01D2259/40043—Purging
    • B01D2259/4005—Nature of purge gas
    • B01D2259/40052—Recycled product or process gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/40011—Methods relating to the process cycle in pressure or temperature swing adsorption
    • B01D2259/40058—Number of sequence steps, including sub-steps, per cycle
    • B01D2259/40066—Six
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/40011—Methods relating to the process cycle in pressure or temperature swing adsorption
    • B01D2259/40058—Number of sequence steps, including sub-steps, per cycle
    • B01D2259/40067—Seven
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/40011—Methods relating to the process cycle in pressure or temperature swing adsorption
    • B01D2259/40058—Number of sequence steps, including sub-steps, per cycle
    • B01D2259/40071—Nine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/40011—Methods relating to the process cycle in pressure or temperature swing adsorption
    • B01D2259/40058—Number of sequence steps, including sub-steps, per cycle
    • B01D2259/40073—Ten
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/404—Further details for adsorption processes and devices using four beds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/406—Further details for adsorption processes and devices using more than four beds
    • B01D2259/4062—Further details for adsorption processes and devices using more than four beds using six beds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/406—Further details for adsorption processes and devices using more than four beds
    • B01D2259/4066—Further details for adsorption processes and devices using more than four beds using nine beds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/414—Further details for adsorption processes and devices using different types of adsorbents
    • B01D2259/4141—Further details for adsorption processes and devices using different types of adsorbents within a single bed
    • B01D2259/4145—Further details for adsorption processes and devices using different types of adsorbents within a single bed arranged in series
    • B01D2259/4146—Contiguous multilayered adsorbents
    • 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
    • B01D53/02—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 adsorption, e.g. preparative gas chromatography
    • B01D53/04—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 adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B01D53/047—Pressure swing adsorption
    • B01D53/0476—Vacuum pressure swing adsorption
    • 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
    • Y02C20/20—Capture or disposal of greenhouse gases of methane
    • 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)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separation Of Gases By Adsorption (AREA)
  • Treating Waste Gases (AREA)
  • Hydrogen, Water And Hydrids (AREA)
DE8787310920T 1986-12-11 1987-12-11 Gastrennung und gasreinigung. Expired - Lifetime DE3780590T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/940,612 US4723966A (en) 1986-12-11 1986-12-11 Gas separation by pressure swing adsorption

Publications (2)

Publication Number Publication Date
DE3780590D1 DE3780590D1 (de) 1992-08-27
DE3780590T2 true DE3780590T2 (de) 1992-12-17

Family

ID=25475148

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8787310920T Expired - Lifetime DE3780590T2 (de) 1986-12-11 1987-12-11 Gastrennung und gasreinigung.

Country Status (11)

Country Link
US (1) US4723966A (OSRAM)
EP (1) EP0271356B1 (OSRAM)
JP (1) JPS63240915A (OSRAM)
KR (1) KR920002081B1 (OSRAM)
CN (1) CN1008065B (OSRAM)
AT (1) ATE78419T1 (OSRAM)
BR (1) BR8706710A (OSRAM)
CA (1) CA1314494C (OSRAM)
DE (1) DE3780590T2 (OSRAM)
ES (1) ES2033885T3 (OSRAM)
IN (1) IN171647B (OSRAM)

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4783203A (en) * 1987-10-22 1988-11-08 Union Carbide Corporation Integrated pressure swing adsorption/membrane separation process
JPH02129014A (ja) * 1988-11-04 1990-05-17 Mitsui Eng & Shipbuild Co Ltd 一酸化炭素ガス製造法
US5013337A (en) * 1988-12-06 1991-05-07 Uop Process for separating a mixture of molecular species using crystalline microporous metal sulfide compositions
US5126120A (en) * 1990-10-02 1992-06-30 Uop Crystalline microporous zinc phosphate compositions
US5203888A (en) * 1990-11-23 1993-04-20 Uop Pressure swing adsorption process with multiple desorption steps
US5122357A (en) * 1991-03-18 1992-06-16 Uop Crystalline microporous metal oxysulfide compositions
US5128025A (en) * 1991-03-18 1992-07-07 Uop Hydrocarbon conversion processes using a novel crystalline microporous metal oxysulfide composition
US5302362A (en) * 1992-04-10 1994-04-12 Uop Crystalline microporous metallo-zinc phosphate compositions
US5449450A (en) * 1992-04-10 1995-09-12 Uop Hydrocarbon conversion process using a crystalline microporous metallo-zinc phosphate composition
US5294247A (en) * 1993-02-26 1994-03-15 Air Products And Chemicals, Inc. Adsorption process to recover hydrogen from low pressure feeds
US5411578A (en) * 1994-05-10 1995-05-02 Air Products And Chemicals, Inc. Vacuum swing adsorption process with mixed repressurization and provide product depressurization
US6048384A (en) * 1997-12-09 2000-04-11 Smolarek; James PSA process and system using simultaneous top and bottom evacuation of absorbent bed
US5997612A (en) * 1998-07-24 1999-12-07 The Boc Group, Inc. Pressure swing adsorption process and apparatus
US6245127B1 (en) 1999-05-27 2001-06-12 Praxair Technology, Inc. Pressure swing adsorption process and apparatus
US6660064B2 (en) * 2002-03-08 2003-12-09 Air Products And Chemicals, Inc. Activated carbon as sole absorbent in rapid cycle hydrogen PSA
WO2005032693A2 (en) * 2003-08-29 2005-04-14 Velocys Inc. Process for separating nitrogen from methane using microchannel process technology
US8241400B2 (en) * 2009-07-15 2012-08-14 L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process for the production of carbon dioxide utilizing a co-purge pressure swing adsorption unit
US8752390B2 (en) * 2010-07-13 2014-06-17 Air Products And Chemicals, Inc. Method and apparatus for producing power and hydrogen
US8778051B2 (en) 2012-03-15 2014-07-15 Air Products And Chemicals, Inc. Pressure swing adsorption process
US8715617B2 (en) 2012-03-15 2014-05-06 Air Products And Chemicals, Inc. Hydrogen production process with low CO2 emissions
FR3011480B1 (fr) * 2013-10-04 2017-01-27 Air Liquide Procede d'adsorption a modulation de pression avec elution supplementaire
US9808755B2 (en) 2015-07-24 2017-11-07 Air Products And Chemicals, Inc. Sour pressure swing adsorption process
CN107456845B (zh) * 2017-08-25 2023-04-04 西南化工研究设计院有限公司 一种变压吸附装置及其控制方法
KR101987804B1 (ko) * 2017-11-17 2019-06-12 한국에너지기술연구원 압력순환흡착방법 및 압력순환흡착장치
US11613866B1 (en) 2019-06-14 2023-03-28 Nusfc, Llc Retainer for closure device

Family Cites Families (18)

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Publication number Priority date Publication date Assignee Title
US2944627A (en) * 1958-02-12 1960-07-12 Exxon Research Engineering Co Method and apparatus for fractionating gaseous mixtures by adsorption
US2978407A (en) * 1958-05-28 1961-04-04 Exxon Research Engineering Co Molecular sieve separation process
FR1306111A (fr) * 1960-09-16 1962-10-13 Union Carbide Corp Procédé de séparation par adsorption
NL297067A (OSRAM) * 1962-09-04 1900-01-01
US3430418A (en) * 1967-08-09 1969-03-04 Union Carbide Corp Selective adsorption process
FR2044058A5 (OSRAM) * 1969-05-07 1971-02-19 Air Liquide
US3738087A (en) * 1971-07-01 1973-06-12 Union Carbide Corp Selective adsorption gas separation process
US4011065A (en) * 1974-01-09 1977-03-08 Bergwerksverband Gmbh Process for the enrichment of gases
US3986849A (en) * 1975-11-07 1976-10-19 Union Carbide Corporation Selective adsorption process
US4093429A (en) * 1975-12-19 1978-06-06 General Electric Company Gas separation system
DE2604305A1 (de) * 1976-02-04 1977-08-11 Linde Ag Verfahren zum zerlegen von gasgemischen
US4264338A (en) * 1977-11-02 1981-04-28 Monsanto Company Method for separating gases
US4354859A (en) * 1981-08-06 1982-10-19 Union Carbide Corporation Enhanced gas separation by selective adsorption
US4398926A (en) * 1982-04-23 1983-08-16 Union Carbide Corporation Enhanced hydrogen recovery from low purity gas streams
US4512780A (en) * 1983-11-08 1985-04-23 Union Carbide Corporation Pressure swing adsorption with intermediate product recovery
ZA849756B (en) * 1983-12-15 1986-06-25 Bergwerksverband Gmbh Process for isolating and recovering gases which are relatively strongly adsorbable on adsorbents from gas mixtures which otherwise essentially contain only less strongly adsorbable gases
US4589888A (en) * 1984-10-05 1986-05-20 Union Carbide Corporation Pressure swing adsorption process
DE3528909A1 (de) * 1985-08-12 1987-02-19 Linde Ag Druckwechseladsorptionsverfahren

Also Published As

Publication number Publication date
EP0271356B1 (en) 1992-07-22
CA1314494C (en) 1993-03-16
JPH0321207B2 (OSRAM) 1991-03-22
ES2033885T3 (es) 1993-04-01
IN171647B (OSRAM) 1992-11-28
BR8706710A (pt) 1988-07-19
JPS63240915A (ja) 1988-10-06
KR880007110A (ko) 1988-08-26
CN87107532A (zh) 1988-08-03
ATE78419T1 (de) 1992-08-15
KR920002081B1 (ko) 1992-03-10
EP0271356A2 (en) 1988-06-15
CN1008065B (zh) 1990-05-23
US4723966A (en) 1988-02-09
DE3780590D1 (de) 1992-08-27
EP0271356A3 (en) 1989-05-31

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