RO85733B - PROCEDEU CRIOGENIC DE îNDEPARTARE A GAZELOR ACIDE DIN AMESTECURI GAZOASE - Google Patents
PROCEDEU CRIOGENIC DE îNDEPARTARE A GAZELOR ACIDE DIN AMESTECURI GAZOASEInfo
- Publication number
- RO85733B RO85733B RO108193A RO10819382A RO85733B RO 85733 B RO85733 B RO 85733B RO 108193 A RO108193 A RO 108193A RO 10819382 A RO10819382 A RO 10819382A RO 85733 B RO85733 B RO 85733B
- Authority
- RO
- Romania
- Prior art keywords
- solvent
- absorption
- solvents
- pressure
- mixture
- Prior art date
Links
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
- F25J3/0233—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
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- 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
- B01D53/1462—Removing mixtures of hydrogen sulfide and carbon dioxide
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- 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
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
- C01B3/50—Separation of hydrogen or hydrogen containing gases from gaseous mixtures, e.g. purification
- C01B3/52—Separation of hydrogen or hydrogen containing gases from gaseous mixtures, e.g. purification by contacting with liquids; Regeneration of used liquids
-
- 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
-
- 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
- F25J3/0266—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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
- C01B2203/04—Integrated processes for the production of hydrogen or synthesis gas containing a purification step for the hydrogen or the synthesis gas
- C01B2203/0415—Purification by absorption in liquids
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
- C01B2203/04—Integrated processes for the production of hydrogen or synthesis gas containing a purification step for the hydrogen or the synthesis gas
- C01B2203/0465—Composition of the impurity
- C01B2203/0475—Composition of the impurity the impurity being carbon dioxide
-
- 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
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- 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
-
- 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
- Y10S62/00—Refrigeration
- Y10S62/928—Recovery of carbon dioxide
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Inorganic Chemistry (AREA)
- Water Supply & Treatment (AREA)
- Gas Separation By Absorption (AREA)
- Industrial Gases (AREA)
- Treating Waste Gases (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Inventia se refera al un procedeu criogenic de îndepartare a gazelor acide din amestecuti gazoase, constînd din gaze naturale sau de sinteza, cu continuturi ridicate de H2S si CO2, prin absorbtie într-un solvent sau mai multi solventi selectivi, caracterizat prin aceea ca, în scopul obtinerii unui grad înalt de puritate a gazului natural sau de sinteza, printr-o tehnologie simpla si accesibila, gazul împartit, eventual, în doua sau mai multe fractiuni, prin condensare fractionata sau expandata, se alimenteaza într-o coloanade distilare sub o presiune de 30...75 at. avînd temperatura la partea superioara de -80-----30 degree C, iar la partea inferioara de -7.....+50 degree C, gazul partial purificat fiind trecut apoi într-o coloana de absorbtie, care functioneaza sun aceasi presiune si la temperatura de -100...-10 degree C, dupa care se regenereaza solventul sau amestecul de solventi evacuati pe la partea inferioara a coloanei de absorbtie, fie prin 2...6 faze de expansiune, presiunea în ultima faza de separare fiind de 0,2...2 at, componentele utile reciclîndu-se la faza de absorbtie, fie se regenereaza solventul sau amestecul de solventi într-o coloana de distilare regenerativa, care functioneaza sub o presiune de 1,1...3 at, avînd o temperatura la baza de 55...100 degree C, solventii regenerati recirculîndu-se în zona de absorbtie. Solventul selectiv la care se adauga apa sau/si metanol, dimetileter sau acetona, în proportie de 0,3...0,4%, raportata la amestecul rezultat, este ales dintre esteri de alcooli, esteri de glicoli, lactone, eteri ciclici, dieteri, monoeteri sau esteri-eteri.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT8123081A IT1211081B (it) | 1981-07-23 | 1981-07-23 | Procedimento criogenico di rimozione di gas acidi da misceledi gas. |
Publications (2)
Publication Number | Publication Date |
---|---|
RO85733A RO85733A (ro) | 1984-11-25 |
RO85733B true RO85733B (ro) | 1984-11-30 |
Family
ID=11203566
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
RO108193A RO85733B (ro) | 1981-07-23 | 1982-07-19 | PROCEDEU CRIOGENIC DE îNDEPARTARE A GAZELOR ACIDE DIN AMESTECURI GAZOASE |
Country Status (18)
Country | Link |
---|---|
US (1) | US4514203A (ro) |
AU (1) | AU557319B2 (ro) |
BR (1) | BR8204065A (ro) |
CA (1) | CA1177381A (ro) |
DE (1) | DE3227477C2 (ro) |
DK (1) | DK328682A (ro) |
ES (1) | ES8402868A1 (ro) |
GB (1) | GB2102696B (ro) |
GR (1) | GR76184B (ro) |
IN (1) | IN158235B (ro) |
IT (1) | IT1211081B (ro) |
MT (1) | MTP912B (ro) |
NO (1) | NO822145L (ro) |
NZ (1) | NZ201064A (ro) |
OA (1) | OA07157A (ro) |
PL (1) | PL237515A1 (ro) |
RO (1) | RO85733B (ro) |
YU (1) | YU160482A (ro) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1193601B (it) * | 1983-01-19 | 1988-07-21 | Snam Progetti | Procedimento criogenico di rimozione selettiva di gas acidi da miscele di gas mediante solvente |
IT1193602B (it) * | 1983-01-19 | 1988-07-21 | Snam Progetti | Procedimento criogenico di rimozione di gas acidi da miscele di gas mediante solvente |
IT1190357B (it) * | 1985-05-24 | 1988-02-16 | Snam Progetti | Procedimento criogenito di rimozione di gas acidi da miscele di gas mediante solventi |
NO874821L (no) * | 1986-12-02 | 1988-06-03 | Norton Co | Fremgangsmaate for aa fjerne karbondioksyd fra en gass. |
ZA899705B (en) * | 1989-01-26 | 1990-09-26 | Aeci Ltd | Purification of gases |
DE4336790C2 (de) * | 1993-10-28 | 1995-08-17 | Ruhr Oel Gmbh | Verfahren zum Reinigen von Druckgasen |
US5927103A (en) * | 1998-06-17 | 1999-07-27 | Praxair Technology, Inc. | Carbon dioxide production system with integral vent gas condenser |
US6070431A (en) * | 1999-02-02 | 2000-06-06 | Praxair Technology, Inc. | Distillation system for producing carbon dioxide |
ATE473796T1 (de) * | 2002-09-17 | 2010-07-15 | Fluor Corp | Konfigurationen und verfahren zur entfernung von sauren gasen |
EP3960265A1 (de) * | 2020-08-31 | 2022-03-02 | Linde GmbH | Verfahren und anlage zur herstellung von dimethylether |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1732371A (en) * | 1926-07-05 | 1929-10-22 | Ig Farbenindustrie Ag | Purifying oil |
US2045321A (en) * | 1932-04-19 | 1936-06-23 | Texas Co | Solvent extraction of hydrocarbon oil |
US2139375A (en) * | 1937-06-14 | 1938-12-06 | Shell Dev | Removal of so from gases |
IT1056904B (it) * | 1976-03-05 | 1982-02-20 | Snam Progetti | Procedimento per la purificazione di gas naturali ad alto contenuto di gas acidi |
DE2923012A1 (de) * | 1979-06-07 | 1980-12-18 | Basf Ag | Verfahren zur gleichzeitigen entfernung von wasser und schwefelwasserstoff aus gasen |
-
1981
- 1981-07-23 IT IT8123081A patent/IT1211081B/it active
-
1982
- 1982-06-23 US US06/391,282 patent/US4514203A/en not_active Expired - Lifetime
- 1982-06-24 NZ NZ201064A patent/NZ201064A/en unknown
- 1982-06-24 GR GR68555A patent/GR76184B/el unknown
- 1982-06-25 NO NO82822145A patent/NO822145L/no unknown
- 1982-06-28 MT MT912A patent/MTP912B/xx unknown
- 1982-07-02 AU AU85567/82A patent/AU557319B2/en not_active Withdrawn - After Issue
- 1982-07-12 BR BR8204065A patent/BR8204065A/pt unknown
- 1982-07-15 CA CA000407330A patent/CA1177381A/en not_active Expired
- 1982-07-15 GB GB08220605A patent/GB2102696B/en not_active Expired
- 1982-07-16 PL PL23751582A patent/PL237515A1/xx unknown
- 1982-07-19 RO RO108193A patent/RO85733B/ro unknown
- 1982-07-20 OA OA57749A patent/OA07157A/xx unknown
- 1982-07-20 ES ES514718A patent/ES8402868A1/es not_active Expired
- 1982-07-21 IN IN843/CAL/82A patent/IN158235B/en unknown
- 1982-07-21 DK DK328682A patent/DK328682A/da not_active Application Discontinuation
- 1982-07-22 YU YU01604/82A patent/YU160482A/xx unknown
- 1982-07-22 DE DE3227477A patent/DE3227477C2/de not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DK328682A (da) | 1983-01-24 |
NZ201064A (en) | 1986-05-09 |
CA1177381A (en) | 1984-11-06 |
IN158235B (ro) | 1986-10-04 |
ES514718A0 (es) | 1984-03-01 |
YU160482A (en) | 1985-03-20 |
DE3227477A1 (de) | 1983-02-10 |
ES8402868A1 (es) | 1984-03-01 |
PL237515A1 (en) | 1983-02-28 |
IT8123081A0 (it) | 1981-07-23 |
GB2102696A (en) | 1983-02-09 |
IT1211081B (it) | 1989-09-29 |
GR76184B (ro) | 1984-08-03 |
AU8556782A (en) | 1983-01-27 |
BR8204065A (pt) | 1983-12-20 |
GB2102696B (en) | 1985-05-09 |
AU557319B2 (en) | 1986-12-18 |
RO85733A (ro) | 1984-11-25 |
NO822145L (no) | 1983-01-24 |
US4514203A (en) | 1985-04-30 |
DE3227477C2 (de) | 1987-05-14 |
OA07157A (fr) | 1984-03-31 |
MTP912B (en) | 1984-04-10 |
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