DE2018244A1 - Verfahren zur Regenerierung von Hydrierungskatalysatoren - Google Patents
Verfahren zur Regenerierung von HydrierungskatalysatorenInfo
- Publication number
- DE2018244A1 DE2018244A1 DE19702018244 DE2018244A DE2018244A1 DE 2018244 A1 DE2018244 A1 DE 2018244A1 DE 19702018244 DE19702018244 DE 19702018244 DE 2018244 A DE2018244 A DE 2018244A DE 2018244 A1 DE2018244 A1 DE 2018244A1
- Authority
- DE
- Germany
- Prior art keywords
- catalyst
- hydrogenation
- deactivated
- hydrogen
- catalysts
- 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.)
- Pending
Links
- 239000003054 catalyst Substances 0.000 title claims description 95
- 238000005984 hydrogenation reaction Methods 0.000 title claims description 41
- 238000000034 method Methods 0.000 title claims description 33
- 230000008569 process Effects 0.000 title claims description 22
- 238000011069 regeneration method Methods 0.000 title claims description 22
- 230000008929 regeneration Effects 0.000 title claims description 21
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 34
- 239000001257 hydrogen Substances 0.000 claims description 25
- 229910052739 hydrogen Inorganic materials 0.000 claims description 25
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 23
- 238000011282 treatment Methods 0.000 claims description 23
- 229930195733 hydrocarbon Natural products 0.000 claims description 17
- 150000002430 hydrocarbons Chemical class 0.000 claims description 17
- 229910052759 nickel Inorganic materials 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000010941 cobalt Substances 0.000 claims description 13
- 229910017052 cobalt Inorganic materials 0.000 claims description 13
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 13
- 239000007789 gas Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 4
- 229910001882 dioxygen Inorganic materials 0.000 claims description 4
- 150000004945 aromatic hydrocarbons Chemical class 0.000 claims description 3
- 125000003118 aryl group Chemical group 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims 1
- 239000002184 metal Substances 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 claims 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 16
- 150000001336 alkenes Chemical class 0.000 description 13
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 12
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 12
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 12
- 229910052794 bromium Inorganic materials 0.000 description 12
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 11
- 229910052717 sulfur Inorganic materials 0.000 description 11
- 239000011593 sulfur Substances 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 10
- 239000000377 silicon dioxide Substances 0.000 description 7
- 150000001993 dienes Chemical class 0.000 description 6
- 125000004432 carbon atom Chemical group C* 0.000 description 5
- 235000012239 silicon dioxide Nutrition 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 4
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical class S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 150000002019 disulfides Chemical class 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 150000003568 thioethers Chemical class 0.000 description 3
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 2
- 241001026509 Kata Species 0.000 description 2
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- YTPLMLYBLZKORZ-UHFFFAOYSA-N Thiophene Chemical compound C=1C=CSC=1 YTPLMLYBLZKORZ-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 150000003464 sulfur compounds Chemical class 0.000 description 2
- 150000003577 thiophenes Chemical class 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- -1 alkyl aromatic hydrocarbons Chemical class 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 241001233037 catfish Species 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- UFMZWBIQTDUYBN-UHFFFAOYSA-N cobalt dinitrate Chemical compound [Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O UFMZWBIQTDUYBN-UHFFFAOYSA-N 0.000 description 1
- 229910001981 cobalt nitrate Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 150000005673 monoalkenes Chemical class 0.000 description 1
- HZPNKQREYVVATQ-UHFFFAOYSA-L nickel(2+);diformate Chemical compound [Ni+2].[O-]C=O.[O-]C=O HZPNKQREYVVATQ-UHFFFAOYSA-L 0.000 description 1
- KBJMLQFLOWQJNF-UHFFFAOYSA-N nickel(ii) nitrate Chemical compound [Ni+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O KBJMLQFLOWQJNF-UHFFFAOYSA-N 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000004230 steam cracking Methods 0.000 description 1
- 229930192474 thiophene Natural products 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 150000003738 xylenes Chemical class 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C5/00—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms
- C07C5/02—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by hydrogenation
- C07C5/03—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by hydrogenation of non-aromatic carbon-to-carbon double bonds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/90—Regeneration or reactivation
- B01J23/94—Regeneration or reactivation of catalysts comprising metals, oxides or hydroxides of the iron group metals or copper
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C5/00—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms
- C07C5/02—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by hydrogenation
- C07C5/10—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by hydrogenation of aromatic six-membered rings
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2521/00—Catalysts comprising the elements, oxides or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium or hafnium
- C07C2521/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
- C07C2521/08—Silica
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2523/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group C07C2521/00
- C07C2523/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group C07C2521/00 of the iron group metals or copper
- C07C2523/74—Iron group metals
- C07C2523/75—Cobalt
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2523/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group C07C2521/00
- C07C2523/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group C07C2521/00 of the iron group metals or copper
- C07C2523/74—Iron group metals
- C07C2523/755—Nickel
-
- 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
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/584—Recycling of catalysts
-
- 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
- Y10S585/00—Chemistry of hydrocarbon compounds
- Y10S585/8995—Catalyst and recycle considerations
- Y10S585/901—Catalyst and recycle considerations with recycle, rehabilitation, or preservation of solvent, diluent, or mass action agent
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Catalysts (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR6912376A FR2036937B1 (enExample) | 1969-04-18 | 1969-04-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE2018244A1 true DE2018244A1 (de) | 1970-11-12 |
Family
ID=9032749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19702018244 Pending DE2018244A1 (de) | 1969-04-18 | 1970-04-16 | Verfahren zur Regenerierung von Hydrierungskatalysatoren |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US3661798A (enExample) |
| JP (1) | JPS4914474B1 (enExample) |
| BE (1) | BE749152A (enExample) |
| DE (1) | DE2018244A1 (enExample) |
| ES (1) | ES378768A1 (enExample) |
| FR (1) | FR2036937B1 (enExample) |
| GB (1) | GB1279554A (enExample) |
| NL (1) | NL7005543A (enExample) |
| OA (1) | OA03646A (enExample) |
| ZA (1) | ZA702543B (enExample) |
Families Citing this family (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4439544A (en) * | 1979-01-02 | 1984-03-27 | Exxon Research And Engineering Co. | Support cobalt-silica coprecipitated hydrogenation catalyst |
| US4420648A (en) * | 1979-01-02 | 1983-12-13 | Exxon Research And Engineering Co. | Process for hydrogenating organic compounds with a supported cobalt-silica coprecipitated hydrogenation catalyst |
| US4876402A (en) * | 1986-11-03 | 1989-10-24 | Union Carbide Chemicals And Plastics Company Inc. | Improved aldehyde hydrogenation process |
| US4762817A (en) * | 1986-11-03 | 1988-08-09 | Union Carbide Corporation | Aldehyde hydrogenation catalyst |
| JP3715893B2 (ja) * | 1998-09-29 | 2005-11-16 | 出光興産株式会社 | 水素化処理触媒の再生方法 |
| US6300268B1 (en) * | 1999-09-10 | 2001-10-09 | Exxon Research And Engineering Company | Process for the reactivation of sulfur deactivated cobalt titania catalysts |
| US6465529B1 (en) | 2000-08-01 | 2002-10-15 | Exxonmobil Research And Engineering Company | Process for increasing cobalt catalyst hydrogenation activity via aqueous low temperature oxidation |
| US6521565B1 (en) | 2000-08-01 | 2003-02-18 | Exxonmobil Research And Engineering Company | Cobalt catalyst compositions useful for conducting carbon monoxide hydrogenation reactions |
| US6355593B1 (en) | 2000-09-01 | 2002-03-12 | Exxonmobil Research And Engineering Company | Fischer-Tropsch catalyst enhancement |
| US6531518B1 (en) | 2000-09-01 | 2003-03-11 | Exxonmobil Research And Engineering Co. | Fischer-Tropsch catalyst enhancement |
| US6706661B1 (en) * | 2000-09-01 | 2004-03-16 | Exxonmobil Research And Engineering Company | Fischer-Tropsch catalyst enhancement |
| US6624204B1 (en) | 2000-09-01 | 2003-09-23 | Exxonmobil Research And Engineering Company | Carbon monoxide hydrogenation process |
| US6787496B2 (en) | 2002-01-29 | 2004-09-07 | Exxonmobil Research And Engineering Company | Supported catalyst treatment |
| US6753286B2 (en) | 2002-01-29 | 2004-06-22 | Exxonmobil Research And Engineering Company | Supported catalyst regeneration |
| US6753354B2 (en) | 2002-01-29 | 2004-06-22 | Exxonmobil Research And Engineering Company | Fischer-tropsch catalyst enhancement |
| US6753351B2 (en) | 2002-01-29 | 2004-06-22 | Exxonmobil Research And Engineering Company | Supported catalyst activation |
| US6777451B2 (en) * | 2002-01-29 | 2004-08-17 | Exxonmobil Research And Engineering Company | Catalyst enhancement |
| US6800579B2 (en) | 2002-01-29 | 2004-10-05 | Exxonmobil Research And Engineering Company | Catalyst regeneration |
| US7419928B2 (en) * | 2003-04-11 | 2008-09-02 | Exxonmobil Research And Engineering Company | Fischer-Tropsch catalyst production |
| US7361619B2 (en) * | 2003-04-11 | 2008-04-22 | Exxonmobil Research And Engineering Company | Fischer-Tropsch catalyst production |
| EP1920836A1 (en) * | 2006-10-27 | 2008-05-14 | Shell Internationale Researchmaatschappij B.V. | Process for regenerating a cobalt catalyst |
| WO2008122636A2 (en) * | 2007-04-10 | 2008-10-16 | Shell Internationale Research Maatschappij B.V. | Steam or water treatment of a catalyst precursor in order to obtain an egg shell ft catalyst |
| US8487011B2 (en) * | 2009-11-24 | 2013-07-16 | Phillips 66 Company | Sulfided fischer-tropsch catalyst |
| RU2539986C2 (ru) * | 2013-04-29 | 2015-01-27 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Чеченский государственный университет" (ФГБОУ ВПО "Чеченский государственный университет") | Способ регенерации никелевого катализатора |
| AU2024225941A1 (en) | 2023-02-20 | 2025-09-04 | Johnson Matthey Davy Technologies Limited | Systems and methods for wet air oxidation regeneration of catalysts with ion exchange |
-
1969
- 1969-04-18 FR FR6912376A patent/FR2036937B1/fr not_active Expired
-
1970
- 1970-04-02 OA OA53892A patent/OA03646A/xx unknown
- 1970-04-14 US US28527A patent/US3661798A/en not_active Expired - Lifetime
- 1970-04-15 GB GB08020/70A patent/GB1279554A/en not_active Expired
- 1970-04-15 JP JP45032625A patent/JPS4914474B1/ja active Pending
- 1970-04-16 DE DE19702018244 patent/DE2018244A1/de active Pending
- 1970-04-16 ZA ZA702543A patent/ZA702543B/xx unknown
- 1970-04-17 NL NL7005543A patent/NL7005543A/xx unknown
- 1970-04-17 BE BE749152D patent/BE749152A/xx unknown
- 1970-04-17 ES ES378768A patent/ES378768A1/es not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ES378768A1 (es) | 1973-02-01 |
| FR2036937B1 (enExample) | 1976-04-16 |
| NL7005543A (enExample) | 1970-10-20 |
| US3661798A (en) | 1972-05-09 |
| OA03646A (fr) | 1971-12-24 |
| FR2036937A1 (enExample) | 1970-12-31 |
| BE749152A (fr) | 1970-10-01 |
| ZA702543B (en) | 1971-06-30 |
| JPS4914474B1 (enExample) | 1974-04-08 |
| GB1279554A (en) | 1972-06-28 |
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