CS209406B2 - Method of making the high quality lubricating oils - Google Patents
Method of making the high quality lubricating oils Download PDFInfo
- Publication number
- CS209406B2 CS209406B2 CS731005A CS100573A CS209406B2 CS 209406 B2 CS209406 B2 CS 209406B2 CS 731005 A CS731005 A CS 731005A CS 100573 A CS100573 A CS 100573A CS 209406 B2 CS209406 B2 CS 209406B2
- Authority
- CS
- Czechoslovakia
- Prior art keywords
- astm
- olefins
- oil
- titanium tetrachloride
- viscosity
- Prior art date
Links
- 239000010687 lubricating oil Substances 0.000 title claims description 7
- 238000004519 manufacturing process Methods 0.000 title description 2
- 239000003054 catalyst Substances 0.000 claims abstract description 27
- 150000001875 compounds Chemical class 0.000 claims abstract description 8
- 150000001336 alkenes Chemical class 0.000 claims description 33
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 28
- 238000006116 polymerization reaction Methods 0.000 claims description 19
- 239000004711 α-olefin Substances 0.000 claims description 19
- 239000000203 mixture Substances 0.000 claims description 17
- 238000005336 cracking Methods 0.000 claims description 14
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 12
- 239000002904 solvent Substances 0.000 claims description 12
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 9
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 claims description 9
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 claims description 6
- UAEPNZWRGJTJPN-UHFFFAOYSA-N methylcyclohexane Chemical compound CC1CCCCC1 UAEPNZWRGJTJPN-UHFFFAOYSA-N 0.000 claims description 6
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 5
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 claims description 4
- MVPPADPHJFYWMZ-UHFFFAOYSA-N chlorobenzene Chemical compound ClC1=CC=CC=C1 MVPPADPHJFYWMZ-UHFFFAOYSA-N 0.000 claims description 4
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 3
- 125000000129 anionic group Chemical group 0.000 claims description 3
- 150000008282 halocarbons Chemical class 0.000 claims description 3
- GYNNXHKOJHMOHS-UHFFFAOYSA-N methyl-cycloheptane Natural products CC1CCCCCC1 GYNNXHKOJHMOHS-UHFFFAOYSA-N 0.000 claims description 3
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 claims description 3
- 230000000379 polymerizing effect Effects 0.000 claims description 3
- 239000008096 xylene Substances 0.000 claims description 3
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 claims description 2
- 239000003849 aromatic solvent Substances 0.000 claims description 2
- 125000004432 carbon atom Chemical group C* 0.000 claims description 2
- PYLWMHQQBFSUBP-UHFFFAOYSA-N monofluorobenzene Chemical compound FC1=CC=CC=C1 PYLWMHQQBFSUBP-UHFFFAOYSA-N 0.000 claims description 2
- 239000012188 paraffin wax Substances 0.000 claims description 2
- 229930195734 saturated hydrocarbon Natural products 0.000 claims description 2
- NFPBAXDIZWHQNT-UHFFFAOYSA-N 4-ethyl-1,1-dimethylcyclohexane Chemical compound CCC1CCC(C)(C)CC1 NFPBAXDIZWHQNT-UHFFFAOYSA-N 0.000 claims 1
- 239000000178 monomer Substances 0.000 abstract description 4
- 229910052723 transition metal Inorganic materials 0.000 abstract description 2
- 150000003624 transition metals Chemical class 0.000 abstract description 2
- 150000001399 aluminium compounds Chemical class 0.000 abstract 2
- 239000003921 oil Substances 0.000 description 65
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 20
- 238000009835 boiling Methods 0.000 description 18
- 239000010936 titanium Substances 0.000 description 17
- AFFLGGQVNFXPEV-UHFFFAOYSA-N 1-decene Chemical compound CCCCCCCCC=C AFFLGGQVNFXPEV-UHFFFAOYSA-N 0.000 description 16
- 238000006243 chemical reaction Methods 0.000 description 15
- 229910052782 aluminium Inorganic materials 0.000 description 10
- 230000005484 gravity Effects 0.000 description 10
- 229910052757 nitrogen Inorganic materials 0.000 description 10
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 10
- 239000001993 wax Substances 0.000 description 10
- 230000009467 reduction Effects 0.000 description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 8
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 7
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 6
- 239000000539 dimer Substances 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 6
- 239000011541 reaction mixture Substances 0.000 description 6
- 230000035484 reaction time Effects 0.000 description 6
- 150000003623 transition metal compounds Chemical class 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 4
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 4
- 238000005984 hydrogenation reaction Methods 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- -1 alkyl radical Chemical group 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 238000006386 neutralization reaction Methods 0.000 description 3
- 229910052763 palladium Inorganic materials 0.000 description 3
- QEGNUYASOUJEHD-UHFFFAOYSA-N 1,1-dimethylcyclohexane Chemical compound CC1(C)CCCCC1 QEGNUYASOUJEHD-UHFFFAOYSA-N 0.000 description 2
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 2
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 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
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 2
- 229910052794 bromium Inorganic materials 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- DIOQZVSQGTUSAI-UHFFFAOYSA-N decane Chemical compound CCCCCCCCCC DIOQZVSQGTUSAI-UHFFFAOYSA-N 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 125000004177 diethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 2
- 238000004821 distillation Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000011630 iodine Substances 0.000 description 2
- 229910052740 iodine Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000010689 synthetic lubricating oil Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- 235000004431 Linum usitatissimum Nutrition 0.000 description 1
- 240000006240 Linum usitatissimum Species 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910003074 TiCl4 Inorganic materials 0.000 description 1
- 239000008346 aqueous phase Substances 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000009918 complex formation Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- LSXWFXONGKSEMY-UHFFFAOYSA-N di-tert-butyl peroxide Chemical compound CC(C)(C)OOC(C)(C)C LSXWFXONGKSEMY-UHFFFAOYSA-N 0.000 description 1
- 239000012969 di-tertiary-butyl peroxide Substances 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- MGDOJPNDRJNJBK-UHFFFAOYSA-N ethylaluminum Chemical compound [Al].C[CH2] MGDOJPNDRJNJBK-UHFFFAOYSA-N 0.000 description 1
- 239000011790 ferrous sulphate Substances 0.000 description 1
- 235000003891 ferrous sulphate Nutrition 0.000 description 1
- 235000004426 flaxseed Nutrition 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 229920006158 high molecular weight polymer Polymers 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000010688 mineral lubricating oil Substances 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000005325 percolation Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 150000003682 vanadium compounds Chemical class 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M3/00—Liquid compositions essentially based on lubricating components other than mineral lubricating oils or fatty oils and their use as lubricants; Use as lubricants of single liquid substances
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F10/00—Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F10/14—Monomers containing five or more carbon atoms
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Polymers & Plastics (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
- Lubricants (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT20564/72A IT953411B (it) | 1972-02-15 | 1972-02-15 | Produzione di lubrificanti sinteti ci da alfa olefine con un sistema catalitico ternario |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CS209406B2 true CS209406B2 (en) | 1981-12-31 |
Family
ID=11168849
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CS731005A CS209406B2 (en) | 1972-02-15 | 1973-02-12 | Method of making the high quality lubricating oils |
Country Status (17)
| Country | Link |
|---|---|
| US (1) | US3884988A (en:Method) |
| BE (1) | BE795283A (en:Method) |
| BG (1) | BG22847A3 (en:Method) |
| CA (1) | CA997697A (en:Method) |
| CS (1) | CS209406B2 (en:Method) |
| DD (1) | DD106865A5 (en:Method) |
| ES (1) | ES411947A1 (en:Method) |
| FR (1) | FR2172192B1 (en:Method) |
| GB (1) | GB1410894A (en:Method) |
| HU (1) | HU165433B (en:Method) |
| IT (1) | IT953411B (en:Method) |
| LU (1) | LU67023A1 (en:Method) |
| NL (1) | NL154222B (en:Method) |
| PL (1) | PL79555B1 (en:Method) |
| SU (1) | SU474997A3 (en:Method) |
| TR (1) | TR17848A (en:Method) |
| YU (1) | YU35039B (en:Method) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| LU74570A1 (en:Method) * | 1976-03-16 | 1977-09-27 | ||
| LU74571A1 (en:Method) * | 1976-03-16 | 1977-09-27 | ||
| WO1998003558A1 (en) * | 1996-07-23 | 1998-01-29 | The Dow Chemical Company | Olefin polymerization catalyst composition comprising group 13 compound |
| US6465383B2 (en) | 2000-01-12 | 2002-10-15 | Eastman Chemical Company | Procatalysts, catalyst systems, and use in olefin polymerization |
| BRPI0107604B1 (pt) | 2000-01-12 | 2015-03-31 | Westlake Longview Corp | Pró-catalisador sólido, sistema catalisador, e, processo para a polimerização de pelo menos uma ou mais olefinas |
| US6696380B2 (en) | 2000-01-12 | 2004-02-24 | Darryl Stephen Williams | Procatalysts, catalyst systems, and use in olefin polymerization |
| US20060180091A1 (en) * | 2005-02-17 | 2006-08-17 | Odom Rete R Jr | Peanut hull gypsum product and method of making same |
| CA2908773C (en) | 2014-05-08 | 2022-09-13 | Ineos Usa Llc | Drilling fluid and process of making the same |
| CA3094401A1 (en) | 2018-04-25 | 2019-11-07 | Ineos Oligomers Usa Llc | Synthetic fluids with improved biodegradability |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE586328A (en:Method) * | 1959-01-08 | |||
| US3259668A (en) * | 1964-01-13 | 1966-07-05 | Sun Oil Co | Preparation of synthetic lubricating oil |
| NL125866C (en:Method) * | 1965-02-03 | |||
| US3489736A (en) * | 1965-04-23 | 1970-01-13 | Showa Denko Kk | Polymerization of olefins |
| CA937952A (en) * | 1969-12-30 | 1973-12-04 | Floris Telemaco | Process for the preparation of synthetic lubricating oils from olefines and products so obtained |
-
1972
- 1972-02-15 IT IT20564/72A patent/IT953411B/it active
-
1973
- 1973-01-31 TR TR17848A patent/TR17848A/xx unknown
- 1973-02-07 GB GB612273A patent/GB1410894A/en not_active Expired
- 1973-02-12 BE BE795283D patent/BE795283A/xx not_active IP Right Cessation
- 1973-02-12 DD DD169280A patent/DD106865A5/xx unknown
- 1973-02-12 CS CS731005A patent/CS209406B2/cs unknown
- 1973-02-13 YU YU368/73A patent/YU35039B/xx unknown
- 1973-02-13 BG BG022714A patent/BG22847A3/xx unknown
- 1973-02-13 PL PL1973160728A patent/PL79555B1/pl unknown
- 1973-02-14 LU LU67023A patent/LU67023A1/xx unknown
- 1973-02-14 FR FR7305104A patent/FR2172192B1/fr not_active Expired
- 1973-02-14 SU SU1881934A patent/SU474997A3/ru active
- 1973-02-14 HU HUSA2464A patent/HU165433B/hu unknown
- 1973-02-14 ES ES0411947A patent/ES411947A1/es not_active Expired
- 1973-02-15 US US332627A patent/US3884988A/en not_active Expired - Lifetime
- 1973-02-15 NL NL737302164A patent/NL154222B/xx not_active IP Right Cessation
- 1973-02-15 CA CA163,966A patent/CA997697A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ES411947A1 (es) | 1976-05-16 |
| BE795283A (fr) | 1973-05-29 |
| DE2307470B2 (de) | 1976-11-25 |
| SU474997A3 (ru) | 1975-06-25 |
| TR17848A (tr) | 1976-04-13 |
| LU67023A1 (en:Method) | 1973-04-19 |
| BG22847A3 (bg) | 1977-04-20 |
| DD106865A5 (en:Method) | 1974-07-05 |
| YU35039B (en) | 1980-06-30 |
| US3884988A (en) | 1975-05-20 |
| HU165433B (en:Method) | 1974-08-28 |
| IT953411B (it) | 1973-08-10 |
| DE2307470A1 (de) | 1973-10-18 |
| FR2172192B1 (en:Method) | 1976-09-10 |
| CA997697A (en) | 1976-09-28 |
| FR2172192A1 (en:Method) | 1973-09-28 |
| NL7302164A (en:Method) | 1973-08-17 |
| PL79555B1 (en:Method) | 1975-06-30 |
| YU36873A (en) | 1979-12-31 |
| NL154222B (nl) | 1977-08-15 |
| GB1410894A (en) | 1975-10-22 |
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