FR2539322A1 - Procede cryogenique pour l'elimination de gaz acides a partir de melanges de gaz au moyen d'un solvant - Google Patents

Procede cryogenique pour l'elimination de gaz acides a partir de melanges de gaz au moyen d'un solvant Download PDF

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Publication number
FR2539322A1
FR2539322A1 FR8400131A FR8400131A FR2539322A1 FR 2539322 A1 FR2539322 A1 FR 2539322A1 FR 8400131 A FR8400131 A FR 8400131A FR 8400131 A FR8400131 A FR 8400131A FR 2539322 A1 FR2539322 A1 FR 2539322A1
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FR
France
Prior art keywords
solvent
process according
gas
absorption column
absorption
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.)
Withdrawn
Application number
FR8400131A
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English (en)
French (fr)
Inventor
Luigi Gazzi
Roberto D Ambra
Roberto Di Cintio
Carlo Rescalli
Alessandro Vetere
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.)
SnamProgetti SpA
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SnamProgetti SpA
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 SnamProgetti SpA filed Critical SnamProgetti SpA
Publication of FR2539322A1 publication Critical patent/FR2539322A1/fr
Withdrawn legal-status Critical Current

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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
    • F25J3/0228—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 characterised by the separated product stream
    • F25J3/0266—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 characterised by the separated product stream separation of carbon dioxide
    • 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
    • B01D53/14—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 absorption
    • B01D53/1425—Regeneration of liquid absorbents
    • 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
    • B01D53/14—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 absorption
    • B01D53/1456—Removing acid components
    • 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
    • B01D53/14—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 absorption
    • B01D53/1493—Selection of liquid materials for use as absorbents
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C7/00—Purification; Separation; Use of additives
    • C07C7/11—Purification; Separation; Use of additives by absorption, i.e. purification or separation of gaseous hydrocarbons with the aid of liquids
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
    • C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
    • C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
    • C10L3/10—Working-up natural gas or synthetic natural gas
    • 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
    • F25J3/0204—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 characterised by the feed stream
    • F25J3/0209—Natural gas or substitute natural gas
    • 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
    • F25J3/0204—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 characterised by the feed stream
    • F25J3/0223—H2/CO mixtures, i.e. synthesis gas; Water gas or shifted synthesis gas
    • 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
    • F25J3/0228—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 characterised by the separated product stream
    • F25J3/0233—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 characterised by the separated product stream separation of CnHm with 1 carbon atom or more
    • 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
    • F25J3/0228—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 characterised by the separated product stream
    • F25J3/0271—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 characterised by the separated product stream separation of H2/CO mixtures, i.e. of synthesis gas
    • 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
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/02—Processes or apparatus using other separation and/or other processing means using simple phase separation in a vessel or drum
    • 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
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/50—Processes or apparatus using other separation and/or other processing means using absorption, i.e. with selective solvents or lean oil, heavier CnHm and including generally a regeneration step for the solvent or lean oil
    • 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
    • F25J2220/00—Processes or apparatus involving steps for the removal of impurities
    • F25J2220/60—Separating impurities from natural gas, e.g. mercury, cyclic hydrocarbons
    • F25J2220/66—Separating acid gases, e.g. CO2, SO2, H2S or RSH
    • 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
    • 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
    • Y02P20/151—Reduction of greenhouse gas [GHG] emissions, e.g. CO2

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Chemical & Material Sciences (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Water Supply & Treatment (AREA)
  • Gas Separation By Absorption (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Treating Waste Gases (AREA)
FR8400131A 1983-01-19 1984-01-05 Procede cryogenique pour l'elimination de gaz acides a partir de melanges de gaz au moyen d'un solvant Withdrawn FR2539322A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT19177/83A IT1193602B (it) 1983-01-19 1983-01-19 Procedimento criogenico di rimozione di gas acidi da miscele di gas mediante solvente

Publications (1)

Publication Number Publication Date
FR2539322A1 true FR2539322A1 (fr) 1984-07-20

Family

ID=11155539

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8400131A Withdrawn FR2539322A1 (fr) 1983-01-19 1984-01-05 Procede cryogenique pour l'elimination de gaz acides a partir de melanges de gaz au moyen d'un solvant

Country Status (18)

Country Link
US (1) US4591370A (enExample)
AU (1) AU2280083A (enExample)
BR (1) BR8400286A (enExample)
CA (1) CA1220411A (enExample)
DE (1) DE3401593A1 (enExample)
ES (1) ES8506204A1 (enExample)
FR (1) FR2539322A1 (enExample)
GB (1) GB2133717B (enExample)
GR (1) GR81688B (enExample)
IN (1) IN159634B (enExample)
IT (1) IT1193602B (enExample)
MT (1) MTP942B (enExample)
MY (1) MY101548A (enExample)
NO (1) NO840156L (enExample)
NZ (1) NZ206616A (enExample)
OA (1) OA07635A (enExample)
PL (1) PL245780A1 (enExample)
YU (1) YU8984A (enExample)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1190357B (it) * 1985-05-24 1988-02-16 Snam Progetti Procedimento criogenito di rimozione di gas acidi da miscele di gas mediante solventi
DE3709363C1 (de) * 1987-03-21 1988-08-18 Metallgesellschaft Ag Verfahren zum Behandeln zweier beladener Waschloesungsstroeme
FR2615184B1 (fr) * 1987-05-15 1989-06-30 Elf Aquitaine Procede cryogenique de desulfuration selective et de degazolinage simultanes d'un melange gazeux consistant principalement en methane et renfermant egalement h2s ainsi que des hydrocarbures en c2 et plus
US5019143A (en) * 1987-09-23 1991-05-28 Mehrta Yuv R Low pressure noncryogenic processing for ethylene recovery
USH825H (en) 1988-05-20 1990-10-02 Exxon Production Research Company Process for conditioning a high carbon dioxide content natural gas stream for gas sweetening
ZA899705B (en) * 1989-01-26 1990-09-26 Aeci Ltd Purification of gases
JPH0418911A (ja) * 1990-05-14 1992-01-23 Toho Chem Ind Co Ltd ガスから酸性成分を除去する方法
AT394953B (de) * 1990-07-23 1992-08-10 Schmid Peter J Verfahren zur abtrennung von schwefelwasserstoff aus gasgemischen
JP2792777B2 (ja) * 1992-01-17 1998-09-03 関西電力株式会社 燃焼排ガス中の炭酸ガスの除去方法
DE19829389C1 (de) * 1998-07-01 2000-01-05 Krupp Uhde Gmbh Verfahren zur Rückgewinnung von Gasen
US7147691B2 (en) * 2002-09-27 2006-12-12 1058238 Alberta Ltd. Acid gas enrichment process
CA2405719A1 (en) * 2002-09-27 2004-03-27 Gary Palmer Acid gas enrichment process
FR2960287A1 (fr) * 2010-05-20 2011-11-25 Air Liquide Procede et appareil de separation d'un melange d'hydrogene et de monoxyde de carbone par distillation et/ou lavage cryogenique
KR101663670B1 (ko) * 2010-06-17 2016-10-07 유니온 엔지니어링 아/에스 액체 이산화탄소를 사용하여 이산화탄소를 정제하기 위한 방법 및 장치
EP3666365A1 (de) * 2018-12-14 2020-06-17 L'air Liquide, Société Anonyme Pour L'Étude Et L'exploitation Des Procédés Georges Claude Verfahren zur regenerierung eines beladenen waschmittels aus einer physikalisch wirkenden gaswäsche und vorrichtung für eine physikalisch wirkende gaswäsche
EP4245402B1 (de) 2022-03-18 2025-01-29 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Verfahren und anlage zur entfernung von kohlendioxid und wasser aus synthesegas
EP4245401A1 (de) * 2022-03-18 2023-09-20 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Verfahren und anlage zur entfernung von kohlendioxid aus synthesegas
US20250249402A1 (en) * 2024-02-05 2025-08-07 Saudi Arabian Oil Company Systems and methods for eliminating flaring in amine sweetening
WO2025257390A1 (en) 2024-06-14 2025-12-18 Basf Se Gas treatment process in ammonia plants with a heat pump system utilizing heat from the lean amine solution

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL68945C (enExample) * 1946-11-04
GB728444A (en) * 1950-12-09 1955-04-20 Linde Eismasch Ag Improvements in or relating to drying or purifying natural gases or waste gases fromhydrogenating or cracking processes
BE520083A (enExample) * 1952-05-21
US2926753A (en) * 1958-10-06 1960-03-01 Fluor Corp Process for carbon dioxide absorption
DE1567690B2 (de) * 1965-11-15 1974-02-14 Metallgesellschaft Ag, 6000 Frankfurt Verfahren zur Herstellung von Wasserstoff aus CO- und H tief 2-reichen, CO tief 2 und Schwefelverbindungen enthaltenden Rohgasen
GB1196610A (en) * 1966-10-11 1970-07-01 Lummus Co Purification of Gases
US3718006A (en) * 1968-12-11 1973-02-27 Linde Ag Process for selective absorption
IT1056904B (it) * 1976-03-05 1982-02-20 Snam Progetti Procedimento per la purificazione di gas naturali ad alto contenuto di gas acidi
GB1545855A (en) * 1977-01-31 1979-05-16 Groom H Machine and guard assembly therefor
DE2909335A1 (de) * 1979-03-09 1980-09-18 Linde Ag Verfahren und vorrichtung zur zerlegung von erdgas
IT1211081B (it) * 1981-07-23 1989-09-29 Snam Progetti Procedimento criogenico di rimozione di gas acidi da misceledi gas.
MTP913B (en) * 1981-07-23 1984-04-10 Snam Progetti Cryogenic process for fracionally removing audie gases from gas mixtures

Also Published As

Publication number Publication date
MTP942B (en) 1984-07-16
CA1220411A (en) 1987-04-14
NO840156L (no) 1984-07-20
GR81688B (enExample) 1984-12-12
IT8319177A0 (it) 1983-01-19
IT1193602B (it) 1988-07-21
BR8400286A (pt) 1984-08-28
GB2133717B (en) 1987-02-25
DE3401593A1 (de) 1984-07-19
ES529394A0 (es) 1985-07-01
AU2280083A (en) 1984-07-26
MY101548A (en) 1991-12-17
ES8506204A1 (es) 1985-07-01
IN159634B (enExample) 1987-05-30
US4591370A (en) 1986-05-27
NZ206616A (en) 1986-11-12
PL245780A1 (en) 1984-08-27
GB2133717A (en) 1984-08-01
OA07635A (fr) 1985-05-23
YU8984A (en) 1986-06-30
GB8400060D0 (en) 1984-02-08

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