SE432415B - Forfarande for framstellning av cyanvete - Google Patents
Forfarande for framstellning av cyanveteInfo
- Publication number
- SE432415B SE432415B SE8008186A SE8008186A SE432415B SE 432415 B SE432415 B SE 432415B SE 8008186 A SE8008186 A SE 8008186A SE 8008186 A SE8008186 A SE 8008186A SE 432415 B SE432415 B SE 432415B
- Authority
- SE
- Sweden
- Prior art keywords
- ammonia
- zeolites
- process according
- desorption
- hydrocarbon
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 30
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 122
- 229910021529 ammonia Inorganic materials 0.000 claims description 59
- LELOWRISYMNNSU-UHFFFAOYSA-N hydrogen cyanide Chemical compound N#C LELOWRISYMNNSU-UHFFFAOYSA-N 0.000 claims description 56
- 239000007789 gas Substances 0.000 claims description 51
- 239000010457 zeolite Substances 0.000 claims description 37
- 238000001179 sorption measurement Methods 0.000 claims description 27
- 238000010926 purge Methods 0.000 claims description 21
- 238000003795 desorption Methods 0.000 claims description 19
- 229930195733 hydrocarbon Natural products 0.000 claims description 16
- 150000002430 hydrocarbons Chemical class 0.000 claims description 16
- 239000004215 Carbon black (E152) Substances 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 13
- 229910052739 hydrogen Inorganic materials 0.000 claims description 10
- 239000001257 hydrogen Substances 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 238000003786 synthesis reaction Methods 0.000 claims description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 3
- 150000002431 hydrogen Chemical class 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- JYIBXUUINYLWLR-UHFFFAOYSA-N aluminum;calcium;potassium;silicon;sodium;trihydrate Chemical compound O.O.O.[Na].[Al].[Si].[K].[Ca] JYIBXUUINYLWLR-UHFFFAOYSA-N 0.000 claims description 2
- AWAUBADRMJIRAK-UHFFFAOYSA-N azane;methane Chemical compound C.N AWAUBADRMJIRAK-UHFFFAOYSA-N 0.000 claims description 2
- 229910001603 clinoptilolite Inorganic materials 0.000 claims description 2
- 229910052675 erionite Inorganic materials 0.000 claims description 2
- 229910052680 mordenite Inorganic materials 0.000 claims description 2
- 239000003570 air Substances 0.000 claims 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 16
- 229910021536 Zeolite Inorganic materials 0.000 description 15
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 15
- 238000002474 experimental method Methods 0.000 description 11
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 10
- 239000003463 adsorbent Substances 0.000 description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 239000002808 molecular sieve Substances 0.000 description 4
- JMANVNJQNLATNU-UHFFFAOYSA-N oxalonitrile Chemical compound N#CC#N JMANVNJQNLATNU-UHFFFAOYSA-N 0.000 description 4
- 230000008929 regeneration Effects 0.000 description 4
- 238000011069 regeneration method Methods 0.000 description 4
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 4
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 3
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 3
- 235000011130 ammonium sulphate Nutrition 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 101100298295 Drosophila melanogaster flfl gene Proteins 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical class OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000499 gel Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 2
- 239000012495 reaction gas Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 238000002336 sorption--desorption measurement Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 150000008043 acidic salts Chemical class 0.000 description 1
- 230000000274 adsorptive effect Effects 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 239000001166 ammonium sulphate Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical class OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- JYIMWRSJCRRYNK-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4] JYIMWRSJCRRYNK-UHFFFAOYSA-N 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- -1 hydrogen hydrogen Chemical class 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052756 noble gas Inorganic materials 0.000 description 1
- 150000002835 noble gases Chemical class 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002594 sorbent Substances 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 238000010626 work up procedure Methods 0.000 description 1
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
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C3/00—Cyanogen; Compounds thereof
- C01C3/02—Preparation, separation or purification of hydrogen cyanide
- C01C3/0208—Preparation in gaseous phase
- C01C3/0229—Preparation in gaseous phase from hydrocarbons and ammonia in the absence of oxygen, e.g. HMA-process
- C01C3/0233—Preparation in gaseous phase from hydrocarbons and ammonia in the absence of oxygen, e.g. HMA-process making use of fluidised beds, e.g. the Shawinigan-process
-
- 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
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/406—Ammonia
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/408—Cyanides, e.g. hydrogen cyanide (HCH)
-
- 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
-
- 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
- B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
- B01D2259/40086—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by using a purge 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
- B01D2259/402—Further details for adsorption processes and devices using two beds
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Toxicology (AREA)
- Inorganic Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Separation Of Gases By Adsorption (AREA)
- Hydrogen, Water And Hydrids (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2947498A DE2947498C2 (de) | 1979-11-24 | 1979-11-24 | Verfahren zur Herstellung von Cyanwasserstoff |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| SE8008186L SE8008186L (sv) | 1981-05-25 |
| SE432415B true SE432415B (sv) | 1984-04-02 |
Family
ID=6086852
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE8008186A SE432415B (sv) | 1979-11-24 | 1980-11-21 | Forfarande for framstellning av cyanvete |
Country Status (22)
| Country | Link |
|---|---|
| US (1) | US4317808A (ru) |
| JP (1) | JPS5688823A (ru) |
| AT (1) | AT367374B (ru) |
| BE (1) | BE886307A (ru) |
| BR (1) | BR8007618A (ru) |
| CA (1) | CA1143133A (ru) |
| CH (1) | CH644825A5 (ru) |
| CS (1) | CS227317B2 (ru) |
| DD (1) | DD154602A5 (ru) |
| DE (1) | DE2947498C2 (ru) |
| ES (1) | ES495603A0 (ru) |
| FR (1) | FR2470092A1 (ru) |
| GB (1) | GB2063234B (ru) |
| IL (1) | IL61547A (ru) |
| IT (1) | IT1129890B (ru) |
| NL (1) | NL8005157A (ru) |
| PL (1) | PL129255B1 (ru) |
| RO (1) | RO81071A (ru) |
| SE (1) | SE432415B (ru) |
| SU (1) | SU1055328A3 (ru) |
| YU (1) | YU41449B (ru) |
| ZA (1) | ZA807174B (ru) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4831208A (en) * | 1987-03-05 | 1989-05-16 | Uop | Chemical processing with an operational step sensitive to a feedstream component |
| ATE234676T1 (de) | 1996-06-06 | 2003-04-15 | Du Pont | Verfahren zur trennung und selektiven entfernung von wasserstoff-verunreinigung aus verfahrensströmungen |
| US5817286A (en) * | 1997-07-25 | 1998-10-06 | Thermatrix Inc. | Processes for the synthesis of hydrogen cyanide |
| SG76635A1 (en) * | 1999-03-10 | 2000-11-21 | Japan Pionics | Process and apparatus for recovering ammonia |
| US6664740B2 (en) * | 2001-02-01 | 2003-12-16 | The Regents Of The University Of California | Formation of a field reversed configuration for magnetic and electrostatic confinement of plasma |
| US8031824B2 (en) * | 2005-03-07 | 2011-10-04 | Regents Of The University Of California | Inductive plasma source for plasma electric generation system |
| US8940077B2 (en) | 2009-12-04 | 2015-01-27 | The Board Of Trustees Of The University Of Illinois | Indirect real-time monitoring and control of electrical resistively heated adsorbent system |
| US8500853B2 (en) * | 2009-12-04 | 2013-08-06 | The Board Of Trustees Of The University Of Illinois | Gas purification system and method for liquefaction of dilute gas components |
| CN104736481B (zh) * | 2012-07-19 | 2018-03-02 | 英威达纺织（英国）有限公司 | 利用空气喷射控制氨提取中的腐蚀 |
| EP3301075A1 (en) | 2016-09-28 | 2018-04-04 | Evonik Degussa GmbH | Method for producing hydrogen cyanide |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1134298A (fr) * | 1953-01-13 | 1957-04-09 | Otto & Co Gmbh Dr C | Procédé et installation pour la séparation des gaz obtenus par la synthèse de l'acide cyanhydrique |
| US2995423A (en) * | 1957-09-20 | 1961-08-08 | Union Carbide Corp | Crystalline zeolite m |
| US3112177A (en) * | 1959-11-11 | 1963-11-26 | Toyo Koatsu Ind Inc | Method of separating ammonia from hydrogen cyanide |
| US3184518A (en) * | 1960-08-22 | 1965-05-18 | Standard Oil Co | Increased efficiency in molecular sieve adsorption system |
| BE617822A (ru) * | 1961-05-19 | |||
| US3517484A (en) * | 1968-03-13 | 1970-06-30 | Union Carbide Corp | Selective adsorption process |
| US3508382A (en) * | 1968-03-13 | 1970-04-28 | Union Carbide Corp | Adsorption process for acidic gases |
| US3732326A (en) * | 1970-05-19 | 1973-05-08 | Mobil Oil Corp | Selective sorption of less polar molecules with crystalline zeolites of high silica/alumina ratio |
| US3719026A (en) * | 1971-06-01 | 1973-03-06 | Zeochem Corp | Selective sorption of non-polar molecules |
| JPS548196B2 (ru) * | 1972-08-12 | 1979-04-13 | ||
| US4056370A (en) * | 1973-06-07 | 1977-11-01 | Bayer Aktiengesellschaft | Zeolite A with improved properties |
| DE2902503A1 (de) * | 1979-01-23 | 1980-07-24 | Alkem Gmbh | Verfahren zur beseitigung von ammoniak aus prozessabgasen |
| DE2913925C2 (de) * | 1979-04-06 | 1982-06-03 | Degussa Ag, 6000 Frankfurt | Verfahren zur Herstellung von Cyanwasserstoff |
-
1979
- 1979-11-24 DE DE2947498A patent/DE2947498C2/de not_active Expired
-
1980
- 1980-09-15 NL NL8005157A patent/NL8005157A/nl not_active Application Discontinuation
- 1980-09-18 YU YU2382/80A patent/YU41449B/xx unknown
- 1980-09-23 SU SU802984493A patent/SU1055328A3/ru active
- 1980-10-03 ES ES495603A patent/ES495603A0/es active Granted
- 1980-10-24 FR FR8022858A patent/FR2470092A1/fr active Granted
- 1980-11-13 RO RO80102580A patent/RO81071A/ro unknown
- 1980-11-18 ZA ZA00807174A patent/ZA807174B/xx unknown
- 1980-11-18 DD DD80225291A patent/DD154602A5/de unknown
- 1980-11-18 US US06/208,026 patent/US4317808A/en not_active Expired - Lifetime
- 1980-11-18 GB GB8036952A patent/GB2063234B/en not_active Expired
- 1980-11-20 CS CS807923A patent/CS227317B2/cs unknown
- 1980-11-21 SE SE8008186A patent/SE432415B/sv not_active IP Right Cessation
- 1980-11-21 BR BR8007618A patent/BR8007618A/pt unknown
- 1980-11-21 BE BE6/47324A patent/BE886307A/fr not_active IP Right Cessation
- 1980-11-21 CA CA000365253A patent/CA1143133A/en not_active Expired
- 1980-11-21 PL PL1980228013A patent/PL129255B1/pl unknown
- 1980-11-21 IT IT68787/80A patent/IT1129890B/it active
- 1980-11-21 AT AT0569780A patent/AT367374B/de active
- 1980-11-21 CH CH863980A patent/CH644825A5/de not_active IP Right Cessation
- 1980-11-24 IL IL61547A patent/IL61547A/xx unknown
- 1980-11-25 JP JP16476580A patent/JPS5688823A/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| US4317808A (en) | 1982-03-02 |
| YU238280A (en) | 1983-02-28 |
| ES8106466A1 (es) | 1981-07-16 |
| ES495603A0 (es) | 1981-07-16 |
| RO81071B (ro) | 1983-07-30 |
| JPS5688823A (en) | 1981-07-18 |
| BR8007618A (pt) | 1981-06-02 |
| FR2470092A1 (fr) | 1981-05-29 |
| FR2470092B1 (ru) | 1985-04-19 |
| RO81071A (ro) | 1983-08-03 |
| CS227317B2 (en) | 1984-04-16 |
| CH644825A5 (de) | 1984-08-31 |
| PL228013A1 (ru) | 1981-07-10 |
| ATA569780A (de) | 1981-11-15 |
| BE886307A (fr) | 1981-05-21 |
| DE2947498A1 (de) | 1981-05-27 |
| SU1055328A3 (ru) | 1983-11-15 |
| CA1143133A (en) | 1983-03-22 |
| IT1129890B (it) | 1986-06-11 |
| GB2063234A (en) | 1981-06-03 |
| SE8008186L (sv) | 1981-05-25 |
| ZA807174B (en) | 1981-11-25 |
| DD154602A5 (de) | 1982-04-07 |
| IL61547A0 (en) | 1980-12-31 |
| YU41449B (en) | 1987-06-30 |
| GB2063234B (en) | 1983-10-12 |
| IL61547A (en) | 1984-05-31 |
| NL8005157A (nl) | 1981-06-16 |
| DE2947498C2 (de) | 1982-01-21 |
| IT8068787A0 (it) | 1980-11-21 |
| AT367374B (de) | 1982-06-25 |
| PL129255B1 (en) | 1984-04-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| NUG | Patent has lapsed |
Ref document number: 8008186-2 Effective date: 19880322 Format of ref document f/p: F |