DE2605106C2 - Verfahren und Vorrichtung zur Herstellung von alkoholischen Phosphorsäurelösungen aus sauren Phosphaten - Google Patents
Verfahren und Vorrichtung zur Herstellung von alkoholischen Phosphorsäurelösungen aus sauren PhosphatenInfo
- Publication number
- DE2605106C2 DE2605106C2 DE2605106A DE2605106A DE2605106C2 DE 2605106 C2 DE2605106 C2 DE 2605106C2 DE 2605106 A DE2605106 A DE 2605106A DE 2605106 A DE2605106 A DE 2605106A DE 2605106 C2 DE2605106 C2 DE 2605106C2
- Authority
- DE
- Germany
- Prior art keywords
- mixer
- alcohol
- chamber
- partition
- phase
- 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
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 title claims description 68
- 229910019142 PO4 Inorganic materials 0.000 title claims description 52
- 235000021317 phosphate Nutrition 0.000 title claims description 52
- 229910000147 aluminium phosphate Inorganic materials 0.000 title claims description 34
- 150000003013 phosphoric acid derivatives Chemical class 0.000 title claims description 25
- 238000000034 method Methods 0.000 title claims description 21
- 230000001476 alcoholic effect Effects 0.000 title claims description 15
- 230000002378 acidificating effect Effects 0.000 title claims description 13
- 238000004519 manufacturing process Methods 0.000 title description 2
- 239000012071 phase Substances 0.000 claims description 44
- 239000002253 acid Substances 0.000 claims description 36
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 32
- 239000011707 mineral Substances 0.000 claims description 32
- 238000002156 mixing Methods 0.000 claims description 30
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 30
- 239000010452 phosphate Substances 0.000 claims description 30
- 150000003839 salts Chemical class 0.000 claims description 27
- 238000005192 partition Methods 0.000 claims description 25
- 239000000203 mixture Substances 0.000 claims description 24
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 19
- 239000000243 solution Substances 0.000 claims description 16
- 239000000725 suspension Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000000926 separation method Methods 0.000 claims description 11
- 150000001298 alcohols Chemical class 0.000 claims description 6
- 239000007791 liquid phase Substances 0.000 claims description 4
- 125000003158 alcohol group Chemical group 0.000 claims description 2
- 239000007864 aqueous solution Substances 0.000 claims description 2
- 239000007900 aqueous suspension Substances 0.000 claims description 2
- 125000004432 carbon atom Chemical group C* 0.000 claims description 2
- 239000011976 maleic acid Substances 0.000 claims 1
- 238000002360 preparation method Methods 0.000 claims 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 20
- 239000000284 extract Substances 0.000 description 9
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 8
- 239000003960 organic solvent Substances 0.000 description 8
- 238000000605 extraction Methods 0.000 description 7
- 239000011541 reaction mixture Substances 0.000 description 5
- 239000002904 solvent Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- AMQJEAYHLZJPGS-UHFFFAOYSA-N N-Pentanol Chemical compound CCCCCO AMQJEAYHLZJPGS-UHFFFAOYSA-N 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 239000012675 alcoholic extract Substances 0.000 description 2
- 241001233037 catfish Species 0.000 description 2
- 230000029087 digestion Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000012266 salt solution Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 240000004808 Saccharomyces cerevisiae Species 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical class O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 239000008346 aqueous phase Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000009969 flowable effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- GVALZJMUIHGIMD-UHFFFAOYSA-H magnesium phosphate Chemical class [Mg+2].[Mg+2].[Mg+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O GVALZJMUIHGIMD-UHFFFAOYSA-H 0.000 description 1
- 239000004137 magnesium phosphate Substances 0.000 description 1
- 235000010994 magnesium phosphates Nutrition 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000011833 salt mixture Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 238000012619 stoichiometric conversion Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/18—Phosphoric acid
- C01B25/22—Preparation by reacting phosphate-containing material with an acid, e.g. wet process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D11/00—Solvent extraction
- B01D11/04—Solvent extraction of solutions which are liquid
- B01D11/0446—Juxtaposition of mixers-settlers
- B01D11/0457—Juxtaposition of mixers-settlers comprising rotating mechanisms, e.g. mixers, mixing pumps
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/18—Phosphoric acid
- C01B25/234—Purification; Stabilisation; Concentration
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Extraction Or Liquid Replacement (AREA)
Priority Applications (25)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2605106A DE2605106C2 (de) | 1976-02-10 | 1976-02-10 | Verfahren und Vorrichtung zur Herstellung von alkoholischen Phosphorsäurelösungen aus sauren Phosphaten |
| CH1612976A CH605406A5 (en:Method) | 1976-02-10 | 1976-12-21 | |
| ES455536A ES455536A1 (es) | 1976-02-10 | 1977-02-01 | Procedimiento para la preparacion de soluciones alcoholicas de acido fosforico a partir de fosfatos acidos. |
| NLAANVRAGE7701104,A NL184731C (nl) | 1976-02-10 | 1977-02-02 | Werkwijze en inrichting voor de bereiding van een alcoholische fosforzuuroplossing. |
| CA271,123A CA1086474A (en) | 1976-02-10 | 1977-02-04 | Process and apparatus for recovering alcoholic phosphoric acid solutions from acid phosphates |
| PH19420A PH13609A (en) | 1976-02-10 | 1977-02-04 | Process for recovering alcoholic phosphoric acid solutions from acid phosphates |
| GB4894/77A GB1521457A (en) | 1976-02-10 | 1977-02-07 | Process and apparatus when used in the process for recovering alcoholic phosphoric acid solutions from acid phosphates |
| DD7700197265A DD127964A5 (de) | 1976-02-10 | 1977-02-07 | Verfahren und vorrichtung zur gewinnung von alkoholischen phosphorsaeureloesungen aus sauren phosphaten |
| AT0081277A AT364343B (de) | 1976-02-10 | 1977-02-08 | Verfahren zur herstellung von alkoholischen phosphorsaeureloesungen aus einer waesserigen loesung oder suspension von sauren phosphaten, sowie vorrichtung zur durchfuehrung des verfahrens |
| FI770410A FI65215C (fi) | 1976-02-10 | 1977-02-08 | Foerfarande och anordning foer framstaellning av alkoholhaltiga fosforsyraloesningar av sura fosfat |
| TR19147A TR19147A (tr) | 1976-02-10 | 1977-02-08 | Asit fosfatlardan itibaren olkollue fosfor asidi eriyiklerinin elde edilmesi icin cihaz ve usul |
| EG77/77A EG12631A (en) | 1976-02-10 | 1977-02-08 | Process and apparatus for recovering alcoholic phosphoric acid solutions from acid phosphates |
| BR7700753A BR7700753A (pt) | 1976-02-10 | 1977-02-08 | Processo e dispositivo para a preparacao de solucoes alcoolicas de acido fosforico a partir de fosfatos acidos |
| IL51405A IL51405A (en) | 1976-02-10 | 1977-02-08 | Process and apparatus for recovering alcoholic phosphoric acid solutions from acid phosphates |
| SE7701433A SE419636B (sv) | 1976-02-10 | 1977-02-09 | Sett och anordning for framstellning av alkoholiska fosforsyralosningar |
| BE174763A BE851226A (fr) | 1976-02-10 | 1977-02-09 | Procede et dispositif pour l'obtention de solutions alcooliques d'acide phosphorique a partir de phosphate acides |
| IT47975/77A IT1081484B (it) | 1976-02-10 | 1977-02-09 | Procedimento ed impianto per ricavare soluzioni di acido fosforico alcoliche da fosfati acidi |
| MX167987A MX144528A (es) | 1976-02-10 | 1977-02-09 | Proceso y aparato mejorados para preparar soluciones alcoholicas de acido fosforico |
| FR7703664A FR2340906A1 (fr) | 1976-02-10 | 1977-02-09 | Procede et dispositif pour l'obtention de solutions alcooliques d'acide phosphorique a partir de phosphates acides. |
| ZA00770727A ZA77727B (en) | 1976-02-10 | 1977-02-09 | Process and apparatus for recovering alcoholic phosphoric acid solutions from acid phosphates |
| DK55577A DK149605C (da) | 1976-02-10 | 1977-02-09 | Fremgangsmaade og apparat til fremstilling af alkoholiske phosphorsyreoploesninger ud fra sure phosphater |
| JP1406377A JPS5297396A (en) | 1976-02-10 | 1977-02-10 | Manufacturing process for alcohoric phosphoric acid solusion from acidic phosphate and its apparutus |
| ES466966A ES466966A1 (es) | 1976-02-10 | 1978-02-14 | Dispositivo para la preparacion de soluciones alcoholicas deacido fosforico a partir de fosfatos acidos. |
| US05/945,501 US4203956A (en) | 1976-02-10 | 1978-09-25 | Process and apparatus for recovering alcoholic phosphoric acid solutions from acid phosphates |
| US06/072,056 US4271128A (en) | 1976-02-10 | 1979-09-04 | Apparatus for recovering alcoholic phosphoric acid solutions from acid phosphates |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2605106A DE2605106C2 (de) | 1976-02-10 | 1976-02-10 | Verfahren und Vorrichtung zur Herstellung von alkoholischen Phosphorsäurelösungen aus sauren Phosphaten |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE2605106A1 DE2605106A1 (de) | 1977-08-11 |
| DE2605106C2 true DE2605106C2 (de) | 1984-06-14 |
Family
ID=5969469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE2605106A Expired DE2605106C2 (de) | 1976-02-10 | 1976-02-10 | Verfahren und Vorrichtung zur Herstellung von alkoholischen Phosphorsäurelösungen aus sauren Phosphaten |
Country Status (23)
| Country | Link |
|---|---|
| US (1) | US4271128A (en:Method) |
| JP (1) | JPS5297396A (en:Method) |
| AT (1) | AT364343B (en:Method) |
| BE (1) | BE851226A (en:Method) |
| BR (1) | BR7700753A (en:Method) |
| CA (1) | CA1086474A (en:Method) |
| CH (1) | CH605406A5 (en:Method) |
| DD (1) | DD127964A5 (en:Method) |
| DE (1) | DE2605106C2 (en:Method) |
| DK (1) | DK149605C (en:Method) |
| EG (1) | EG12631A (en:Method) |
| ES (2) | ES455536A1 (en:Method) |
| FI (1) | FI65215C (en:Method) |
| FR (1) | FR2340906A1 (en:Method) |
| GB (1) | GB1521457A (en:Method) |
| IL (1) | IL51405A (en:Method) |
| IT (1) | IT1081484B (en:Method) |
| MX (1) | MX144528A (en:Method) |
| NL (1) | NL184731C (en:Method) |
| PH (1) | PH13609A (en:Method) |
| SE (1) | SE419636B (en:Method) |
| TR (1) | TR19147A (en:Method) |
| ZA (1) | ZA77727B (en:Method) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2657190C2 (de) * | 1976-12-17 | 1982-11-04 | Hoechst Ag, 6000 Frankfurt | Verfahren zur Reinigung von Naßverfahrensphosphorsäure |
| DE2657189B2 (de) * | 1976-12-17 | 1980-02-07 | Hoechst Ag, 6000 Frankfurt | Verfahren zur Reinigung von NaBverfahrensphosphorsäure |
| JPS5552826Y2 (en:Method) * | 1977-07-21 | 1980-12-08 | ||
| US4197280A (en) * | 1978-10-02 | 1980-04-08 | Stauffer Chemical Company | Wet process phosphoric acid purification |
| JPS56100117A (en) | 1980-01-14 | 1981-08-11 | Toyo Soda Mfg Co Ltd | Purifying method for wet process phosphoric acid |
| DE3246415A1 (de) * | 1982-12-15 | 1984-06-20 | Hoechst Ag, 6230 Frankfurt | Verfahren zur reinigung von nassverfahrenphosphorsaeure |
| DE3718338A1 (de) * | 1987-06-01 | 1989-01-05 | Karlsruhe Wiederaufarbeit | Verfahren und vorrichtung zur loesungsmittelwaesche bei der wiederaufarbeitung von bestrahlten kernbrennstoffen |
| FI88773C (fi) * | 1990-04-04 | 1993-07-12 | Outokumpu Oy | Saett att blanda ihop och separera tvao loesningsfaser samt apparatur foer detta |
| DE69222460T2 (de) * | 1991-04-26 | 1998-02-26 | Kureha Chemical Ind Co Ltd | Verfahren und Vorrichtung zur Herstellung wässriger Lösung von gelöschtem Kalk |
| GB9618952D0 (en) | 1996-09-11 | 1996-10-23 | Sandoz Ltd | Process |
| RU2188067C2 (ru) * | 2000-07-03 | 2002-08-27 | Федеральное государственное унитарное предприятие "Сибирский химический комбинат" | Пульсационный реактор ящичного типа |
| CN102887496B (zh) * | 2011-07-18 | 2016-03-23 | 湖北三宁化工股份有限公司 | 一种用于湿法磷酸精制的萃取装置 |
| CN117699759A (zh) * | 2023-11-03 | 2024-03-15 | 宜都兴发化工有限公司 | 一种脱氟沉降剂及湿法精制磷酸预处理中的应用 |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1297171A (en) * | 1917-12-05 | 1919-03-11 | Chance And Hunt Ltd | Apparatus for the treatment of one liquid with another. |
| US2698219A (en) * | 1949-04-16 | 1954-12-28 | Saint Gobain | Elimination of foam in foaming chemical reactions and apparatus therefor |
| US2754179A (en) * | 1954-08-05 | 1956-07-10 | Marvin E Whatley | Mixer-settler |
| US2885265A (en) * | 1955-06-21 | 1959-05-05 | Horizons Inc | Process for producing substantially pure orthophosphoric acid |
| ES247017A1 (es) * | 1958-02-06 | 1959-09-01 | Saint Gobain | Instalacion para la circulacion y mezcla de diferentes liquidos |
| IL27538A (en) * | 1967-03-06 | 1970-09-17 | Blumberg R | Cleaning of phosphoric acid |
| DE2029564C3 (de) * | 1970-06-16 | 1978-06-22 | Giulini Chemie Gmbh, 6700 Ludwigshafen | Verfahren zur Herstellung von reinen Alkaliphosphaten aus Rohphosphorsäure |
| US3723606A (en) * | 1970-12-21 | 1973-03-27 | Allied Chem | Production of phosphoric acid |
| JPS5333960B2 (en:Method) * | 1972-06-10 | 1978-09-18 | ||
| NO135084C (en:Method) * | 1974-07-03 | 1977-02-09 | Sjeldne Jordarter Forskning |
-
1976
- 1976-02-10 DE DE2605106A patent/DE2605106C2/de not_active Expired
- 1976-12-21 CH CH1612976A patent/CH605406A5/xx not_active IP Right Cessation
-
1977
- 1977-02-01 ES ES455536A patent/ES455536A1/es not_active Expired
- 1977-02-02 NL NLAANVRAGE7701104,A patent/NL184731C/xx not_active IP Right Cessation
- 1977-02-04 CA CA271,123A patent/CA1086474A/en not_active Expired
- 1977-02-04 PH PH19420A patent/PH13609A/en unknown
- 1977-02-07 DD DD7700197265A patent/DD127964A5/xx unknown
- 1977-02-07 GB GB4894/77A patent/GB1521457A/en not_active Expired
- 1977-02-08 AT AT0081277A patent/AT364343B/de not_active IP Right Cessation
- 1977-02-08 IL IL51405A patent/IL51405A/xx unknown
- 1977-02-08 BR BR7700753A patent/BR7700753A/pt unknown
- 1977-02-08 FI FI770410A patent/FI65215C/fi not_active IP Right Cessation
- 1977-02-08 EG EG77/77A patent/EG12631A/xx active
- 1977-02-08 TR TR19147A patent/TR19147A/xx unknown
- 1977-02-09 SE SE7701433A patent/SE419636B/xx not_active IP Right Cessation
- 1977-02-09 MX MX167987A patent/MX144528A/es unknown
- 1977-02-09 IT IT47975/77A patent/IT1081484B/it active
- 1977-02-09 FR FR7703664A patent/FR2340906A1/fr active Granted
- 1977-02-09 DK DK55577A patent/DK149605C/da not_active IP Right Cessation
- 1977-02-09 ZA ZA00770727A patent/ZA77727B/xx unknown
- 1977-02-09 BE BE174763A patent/BE851226A/xx not_active IP Right Cessation
- 1977-02-10 JP JP1406377A patent/JPS5297396A/ja active Granted
-
1978
- 1978-02-14 ES ES466966A patent/ES466966A1/es not_active Expired
-
1979
- 1979-09-04 US US06/072,056 patent/US4271128A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| BE851226A (fr) | 1977-08-09 |
| DE2605106A1 (de) | 1977-08-11 |
| US4271128A (en) | 1981-06-02 |
| DK55577A (da) | 1977-08-11 |
| FI65215C (fi) | 1984-04-10 |
| PH13609A (en) | 1980-08-05 |
| GB1521457A (en) | 1978-08-16 |
| BR7700753A (pt) | 1977-10-11 |
| FR2340906A1 (fr) | 1977-09-09 |
| IL51405A (en) | 1979-11-30 |
| NL7701104A (nl) | 1977-08-12 |
| MX144528A (es) | 1981-10-23 |
| CA1086474A (en) | 1980-09-30 |
| ZA77727B (en) | 1978-10-25 |
| DD127964A5 (de) | 1977-10-26 |
| IT1081484B (it) | 1985-05-21 |
| EG12631A (en) | 1979-12-31 |
| NL184731B (nl) | 1989-05-16 |
| FI770410A7 (en:Method) | 1977-08-11 |
| FI65215B (fi) | 1983-12-30 |
| JPS5516970B2 (en:Method) | 1980-05-08 |
| ES455536A1 (es) | 1978-04-16 |
| ES466966A1 (es) | 1978-10-16 |
| DK149605B (da) | 1986-08-11 |
| ATA81277A (de) | 1981-03-15 |
| JPS5297396A (en) | 1977-08-16 |
| CH605406A5 (en:Method) | 1978-09-29 |
| NL184731C (nl) | 1989-10-16 |
| FR2340906B1 (en:Method) | 1982-03-26 |
| AT364343B (de) | 1981-10-12 |
| SE7701433L (sv) | 1977-08-11 |
| DK149605C (da) | 1987-01-05 |
| SE419636B (sv) | 1981-08-17 |
| IL51405A0 (en) | 1977-04-29 |
| TR19147A (tr) | 1978-06-07 |
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