DE3249675C2 - Verfahren zur Herstellung von Methylmethacrylat - Google Patents
Verfahren zur Herstellung von MethylmethacrylatInfo
- Publication number
- DE3249675C2 DE3249675C2 DE3249675A DE3249675A DE3249675C2 DE 3249675 C2 DE3249675 C2 DE 3249675C2 DE 3249675 A DE3249675 A DE 3249675A DE 3249675 A DE3249675 A DE 3249675A DE 3249675 C2 DE3249675 C2 DE 3249675C2
- Authority
- DE
- Germany
- Prior art keywords
- hydrofluoric acid
- esterification
- carbon monoxide
- anhydrous
- isobutyryl fluoride
- 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.)
- Expired
Links
- 238000000034 method Methods 0.000 title claims description 19
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 title claims description 5
- 238000002360 preparation method Methods 0.000 title claims description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 73
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 69
- FSQOYWQCIXSBNP-UHFFFAOYSA-N 2-methylpropanoyl fluoride Chemical compound CC(C)C(F)=O FSQOYWQCIXSBNP-UHFFFAOYSA-N 0.000 claims description 40
- BHIWKHZACMWKOJ-UHFFFAOYSA-N methyl isobutyrate Chemical compound COC(=O)C(C)C BHIWKHZACMWKOJ-UHFFFAOYSA-N 0.000 claims description 40
- 238000005886 esterification reaction Methods 0.000 claims description 34
- 230000032050 esterification Effects 0.000 claims description 26
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 25
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 25
- 239000000203 mixture Substances 0.000 claims description 21
- WDAXFOBOLVPGLV-UHFFFAOYSA-N isobutyric acid ethyl ester Natural products CCOC(=O)C(C)C WDAXFOBOLVPGLV-UHFFFAOYSA-N 0.000 claims description 20
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims description 19
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims description 13
- 239000003054 catalyst Substances 0.000 claims description 6
- 239000012808 vapor phase Substances 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 description 13
- 238000004821 distillation Methods 0.000 description 11
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 10
- 238000000926 separation method Methods 0.000 description 9
- 239000000047 product Substances 0.000 description 8
- 239000000376 reactant Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 239000011541 reaction mixture Substances 0.000 description 5
- 239000002904 solvent Substances 0.000 description 5
- 125000004429 atom Chemical group 0.000 description 4
- 150000001733 carboxylic acid esters Chemical class 0.000 description 4
- 239000012190 activator Substances 0.000 description 3
- 239000006227 byproduct Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 238000005810 carbonylation reaction Methods 0.000 description 2
- 150000001735 carboxylic acids Chemical class 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- KQNPFQTWMSNSAP-UHFFFAOYSA-N isobutyric acid Chemical compound CC(C)C(O)=O KQNPFQTWMSNSAP-UHFFFAOYSA-N 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- WGCJTTUVWKJDAX-UHFFFAOYSA-N 1-fluoro-2-methylpropane Chemical compound CC(C)CF WGCJTTUVWKJDAX-UHFFFAOYSA-N 0.000 description 1
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000011260 aqueous acid Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- VNWKTOKETHGBQD-YPZZEJLDSA-N carbane Chemical compound [10CH4] VNWKTOKETHGBQD-YPZZEJLDSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- RBHJBMIOOPYDBQ-UHFFFAOYSA-N carbon dioxide;propan-2-one Chemical compound O=C=O.CC(C)=O RBHJBMIOOPYDBQ-UHFFFAOYSA-N 0.000 description 1
- 230000006315 carbonylation Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000012043 crude product Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 150000005828 hydrofluoroalkanes Chemical class 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000003701 inert diluent Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- -1 methanol Chemical compound 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000001577 simple distillation Methods 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C1/00—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/10—Preparation of carboxylic acids or their salts, halides or anhydrides by reaction with carbon monoxide
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/347—Preparation of carboxylic acids or their salts, halides or anhydrides by reactions not involving formation of carboxyl groups
- C07C51/363—Preparation of carboxylic acids or their salts, halides or anhydrides by reactions not involving formation of carboxyl groups by introduction of halogen; by substitution of halogen atoms by other halogen atoms
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/58—Preparation of carboxylic acid halides
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C53/00—Saturated compounds having only one carboxyl group bound to an acyclic carbon atom or hydrogen
- C07C53/38—Acyl halides
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/03—Preparation of carboxylic acid esters by reacting an ester group with a hydroxy group
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/04—Preparation of carboxylic acid esters by reacting carboxylic acids or symmetrical anhydrides onto unsaturated carbon-to-carbon bonds
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/08—Preparation of carboxylic acid esters by reacting carboxylic acids or symmetrical anhydrides with the hydroxy or O-metal group of organic compounds
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/10—Preparation of carboxylic acid esters by reacting carboxylic acids or symmetrical anhydrides with ester groups or with a carbon-halogen bond
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/14—Preparation of carboxylic acid esters from carboxylic acid halides
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/30—Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group
- C07C67/317—Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group by splitting-off hydrogen or functional groups; by hydrogenolysis of functional groups
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/36—Preparation of carboxylic acid esters by reaction with carbon monoxide or formates
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/48—Separation; Purification; Stabilisation; Use of additives
- C07C67/52—Separation; Purification; Stabilisation; Use of additives by change in the physical state, e.g. crystallisation
- C07C67/54—Separation; Purification; Stabilisation; Use of additives by change in the physical state, e.g. crystallisation by distillation
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C69/00—Esters of carboxylic acids; Esters of carbonic or haloformic acids
- C07C69/02—Esters of acyclic saturated monocarboxylic acids having the carboxyl group bound to an acyclic carbon atom or to hydrogen
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C69/00—Esters of carboxylic acids; Esters of carbonic or haloformic acids
- C07C69/02—Esters of acyclic saturated monocarboxylic acids having the carboxyl group bound to an acyclic carbon atom or to hydrogen
- C07C69/12—Acetic acid esters
- C07C69/14—Acetic acid esters of monohydroxylic compounds
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C69/00—Esters of carboxylic acids; Esters of carbonic or haloformic acids
- C07C69/02—Esters of acyclic saturated monocarboxylic acids having the carboxyl group bound to an acyclic carbon atom or to hydrogen
- C07C69/22—Esters of acyclic saturated monocarboxylic acids having the carboxyl group bound to an acyclic carbon atom or to hydrogen having three or more carbon atoms in the acid moiety
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C69/00—Esters of carboxylic acids; Esters of carbonic or haloformic acids
- C07C69/02—Esters of acyclic saturated monocarboxylic acids having the carboxyl group bound to an acyclic carbon atom or to hydrogen
- C07C69/22—Esters of acyclic saturated monocarboxylic acids having the carboxyl group bound to an acyclic carbon atom or to hydrogen having three or more carbon atoms in the acid moiety
- C07C69/24—Esters of acyclic saturated monocarboxylic acids having the carboxyl group bound to an acyclic carbon atom or to hydrogen having three or more carbon atoms in the acid moiety esterified with monohydroxylic compounds
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C69/00—Esters of carboxylic acids; Esters of carbonic or haloformic acids
- C07C69/52—Esters of acyclic unsaturated carboxylic acids having the esterified carboxyl group bound to an acyclic carbon atom
- C07C69/533—Monocarboxylic acid esters having only one carbon-to-carbon double bond
- C07C69/54—Acrylic acid esters; Methacrylic acid esters
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Crystallography & Structural Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US28212281A | 1981-07-10 | 1981-07-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE3249675A1 DE3249675A1 (enExample) | 1985-04-18 |
| DE3249675C2 true DE3249675C2 (de) | 1987-01-08 |
Family
ID=23080195
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE3249675A Expired DE3249675C2 (de) | 1981-07-10 | 1982-06-04 | Verfahren zur Herstellung von Methylmethacrylat |
| DE3221175A Expired DE3221175C2 (de) | 1981-07-10 | 1982-06-04 | Verfahren zur Herstellung von Methylisobutyrat |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE3221175A Expired DE3221175C2 (de) | 1981-07-10 | 1982-06-04 | Verfahren zur Herstellung von Methylisobutyrat |
Country Status (12)
| Country | Link |
|---|---|
| JP (1) | JPS5810538A (enExample) |
| KR (1) | KR850001915B1 (enExample) |
| AT (1) | AT390056B (enExample) |
| AU (1) | AU535364B2 (enExample) |
| BE (1) | BE893416A (enExample) |
| CA (1) | CA1156256A (enExample) |
| CH (2) | CH657845A5 (enExample) |
| DE (2) | DE3249675C2 (enExample) |
| FR (1) | FR2509293B1 (enExample) |
| GB (1) | GB2101592B (enExample) |
| IT (1) | IT1195929B (enExample) |
| NL (1) | NL187015C (enExample) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6135980U (ja) * | 1984-07-31 | 1986-03-05 | 東陶機器株式会社 | 便器洗浄用排水弁 |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE972291C (de) * | 1954-05-16 | 1959-07-02 | Studiengesellschaft Kohle Mbh | Verfahren zur Herstellung von Monocarbonsaeuren aus Olefinen, Kohlenoxyd und Wasser |
| DE973077C (de) * | 1954-07-30 | 1959-11-26 | Studiengesellschaft Kohle Mbh | Verfahren zur Herstellung von Carbonsaeuren aus Olefinen und Kohlenoxyd |
| DE1064941B (de) * | 1957-04-24 | 1959-09-10 | Studiengesellschaft Kohle Mbh | Verfahren zur Herstellung von Gemischen aus gesaettigten aliphatischen oder cycloaliphatischen Monocarbonsaeurealkylestern |
| US3167585A (en) * | 1960-08-25 | 1965-01-26 | Gulf Research Development Co | Process for carboxylation of iso-olefins |
| GB942367A (en) * | 1961-04-29 | 1963-11-20 | Basf Ag | Continuous production of carboxylic acids from olefines, carbon monoxide and water |
| NL6816940A (enExample) * | 1967-11-28 | 1969-05-30 | ||
| BE755997A (fr) * | 1969-09-11 | 1971-03-10 | Bp Chem Int Ltd | Production d'acides dicarboxyliques |
| IT995328B (it) * | 1973-08-13 | 1975-11-10 | Montedison Spa | Procedimento per la preparazione di acidi alfa beta insaturi per ossidazione catalitica in fase gassosa di corrispondenti acidi saturi |
| US4224232A (en) * | 1978-12-21 | 1980-09-23 | Gulf Research & Development Company | Production of carboxylic acids from olefins and mixtures of olefins |
| EP0031886B1 (de) * | 1979-12-20 | 1984-04-11 | Röhm Gmbh | Verfahren zur Herstellung von Isobuttersäure oder ihrer niederen Alkylester |
-
1982
- 1982-06-04 CH CH158/86A patent/CH657845A5/de not_active IP Right Cessation
- 1982-06-04 DE DE3249675A patent/DE3249675C2/de not_active Expired
- 1982-06-04 AU AU84607/82A patent/AU535364B2/en not_active Ceased
- 1982-06-04 FR FR8209810A patent/FR2509293B1/fr not_active Expired
- 1982-06-04 GB GB08216303A patent/GB2101592B/en not_active Expired
- 1982-06-04 NL NLAANVRAGE8202271,A patent/NL187015C/xx not_active IP Right Cessation
- 1982-06-04 CH CH3478/82A patent/CH656872A5/de not_active IP Right Cessation
- 1982-06-04 DE DE3221175A patent/DE3221175C2/de not_active Expired
- 1982-06-04 KR KR8202510A patent/KR850001915B1/ko not_active Expired
- 1982-06-04 IT IT21705/82A patent/IT1195929B/it active
- 1982-06-04 BE BE0/208268A patent/BE893416A/fr not_active IP Right Cessation
- 1982-06-04 CA CA000404471A patent/CA1156256A/en not_active Expired
- 1982-06-04 JP JP57096068A patent/JPS5810538A/ja active Granted
- 1982-06-07 AT AT0220382A patent/AT390056B/de not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| IT1195929B (it) | 1988-11-03 |
| CH656872A5 (de) | 1986-07-31 |
| ATA220382A (de) | 1989-08-15 |
| FR2509293B1 (fr) | 1987-02-27 |
| NL8202271A (nl) | 1983-02-01 |
| AU8460782A (en) | 1983-03-24 |
| GB2101592B (en) | 1985-10-30 |
| JPS5810538A (ja) | 1983-01-21 |
| AU535364B2 (en) | 1984-03-15 |
| CA1156256A (en) | 1983-11-01 |
| GB2101592A (en) | 1983-01-19 |
| KR850001915B1 (ko) | 1985-12-31 |
| JPS6227055B2 (enExample) | 1987-06-12 |
| IT8221705A0 (it) | 1982-06-04 |
| AT390056B (de) | 1990-03-12 |
| NL187015C (nl) | 1991-05-01 |
| DE3221175C2 (de) | 1985-08-29 |
| KR840000469A (ko) | 1984-02-22 |
| DE3221175A1 (de) | 1983-01-27 |
| DE3249675A1 (enExample) | 1985-04-18 |
| BE893416A (fr) | 1982-10-01 |
| CH657845A5 (de) | 1986-09-30 |
| FR2509293A1 (fr) | 1983-01-14 |
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