SE430176B - Forfarande for framstellning av natriumhypoklorit genom elektrolys av en vattenlosning av natriumklorid - Google Patents
Forfarande for framstellning av natriumhypoklorit genom elektrolys av en vattenlosning av natriumkloridInfo
- Publication number
- SE430176B SE430176B SE7801873A SE7801873A SE430176B SE 430176 B SE430176 B SE 430176B SE 7801873 A SE7801873 A SE 7801873A SE 7801873 A SE7801873 A SE 7801873A SE 430176 B SE430176 B SE 430176B
- Authority
- SE
- Sweden
- Prior art keywords
- cathode
- anode
- electrolyte solution
- temperature
- sodium
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 25
- 238000002360 preparation method Methods 0.000 title claims description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 title description 4
- 229910052708 sodium Inorganic materials 0.000 title description 4
- 239000011734 sodium Substances 0.000 title description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 43
- 239000008151 electrolyte solution Substances 0.000 claims description 34
- 238000005868 electrolysis reaction Methods 0.000 claims description 28
- 239000005708 Sodium hypochlorite Substances 0.000 claims description 27
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims description 27
- 238000001816 cooling Methods 0.000 claims description 23
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 22
- 239000000460 chlorine Substances 0.000 claims description 22
- 229910052801 chlorine Inorganic materials 0.000 claims description 22
- 239000011780 sodium chloride Substances 0.000 claims description 22
- 239000007864 aqueous solution Substances 0.000 claims description 16
- 239000003792 electrolyte Substances 0.000 claims description 7
- 239000000243 solution Substances 0.000 claims description 7
- 239000007858 starting material Substances 0.000 claims description 5
- 210000004027 cell Anatomy 0.000 description 44
- 238000006243 chemical reaction Methods 0.000 description 23
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 8
- 238000010276 construction Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000010936 titanium Substances 0.000 description 8
- 229910052719 titanium Inorganic materials 0.000 description 8
- BZSXEZOLBIJVQK-UHFFFAOYSA-N 2-methylsulfonylbenzoic acid Chemical compound CS(=O)(=O)C1=CC=CC=C1C(O)=O BZSXEZOLBIJVQK-UHFFFAOYSA-N 0.000 description 7
- -1 alkali metal hypochlorites Chemical class 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000006722 reduction reaction Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 4
- 238000005192 partition Methods 0.000 description 4
- 229920000915 polyvinyl chloride Polymers 0.000 description 4
- 239000004800 polyvinyl chloride Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 239000010405 anode material Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000010406 cathode material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 229910001925 ruthenium oxide Inorganic materials 0.000 description 2
- WOCIAKWEIIZHES-UHFFFAOYSA-N ruthenium(iv) oxide Chemical compound O=[Ru]=O WOCIAKWEIIZHES-UHFFFAOYSA-N 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 235000005881 Calendula officinalis Nutrition 0.000 description 1
- XTEGARKTQYYJKE-UHFFFAOYSA-M Chlorate Chemical compound [O-]Cl(=O)=O XTEGARKTQYYJKE-UHFFFAOYSA-M 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 240000000785 Tagetes erecta Species 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 229940005989 chlorate ion Drugs 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000012777 electrically insulating material Substances 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 238000009790 rate-determining step (RDS) Methods 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/24—Halogens or compounds thereof
- C25B1/26—Chlorine; Compounds thereof
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
- C02F1/4674—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation with halogen or compound of halogens, e.g. chlorine, bromine
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1608977A JPS53102295A (en) | 1977-02-18 | 1977-02-18 | Method of making sodium hypochlorite |
| JP1608877A JPS53102294A (en) | 1977-02-18 | 1977-02-18 | Method of making sodium hypochlorite |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| SE7801873L SE7801873L (sv) | 1978-08-19 |
| SE430176B true SE430176B (sv) | 1983-10-24 |
Family
ID=26352343
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE7801873A SE430176B (sv) | 1977-02-18 | 1978-02-17 | Forfarande for framstellning av natriumhypoklorit genom elektrolys av en vattenlosning av natriumklorid |
Country Status (14)
| Country | Link |
|---|---|
| US (1) | US4151052A (de) |
| AR (1) | AR215047A1 (de) |
| AU (1) | AU515212B2 (de) |
| BR (1) | BR7800889A (de) |
| CA (1) | CA1114329A (de) |
| DE (1) | DE2806441C3 (de) |
| DK (1) | DK73478A (de) |
| ES (1) | ES466797A1 (de) |
| FR (1) | FR2381112A1 (de) |
| GB (1) | GB1559957A (de) |
| IT (1) | IT1102383B (de) |
| NL (1) | NL7801186A (de) |
| PT (1) | PT67666B (de) |
| SE (1) | SE430176B (de) |
Families Citing this family (40)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1094825B (it) * | 1978-05-11 | 1985-08-10 | Panclor Chemicals Ltd | Procedimento ed apparecchiatura per l'alogenazione dell'acqua |
| JPS563689A (en) * | 1979-06-26 | 1981-01-14 | Chlorine Eng Corp Ltd | Electrolytic apparatus for electrolysis of aqueous solution |
| CA1160140A (fr) * | 1979-12-20 | 1984-01-10 | Alain Groult | Machine et methode automatique a laver le linge ou la vaisselle |
| US4295951A (en) * | 1980-05-14 | 1981-10-20 | Hooker Chemicals & Plastics Corp. | Film-coated cathodes for halate cells |
| JPS5924192B2 (ja) * | 1981-05-22 | 1984-06-07 | 日本カ−リツト株式会社 | 塩水電解槽 |
| US4871703A (en) * | 1983-05-31 | 1989-10-03 | The Dow Chemical Company | Process for preparation of an electrocatalyst |
| US4610762A (en) * | 1985-05-31 | 1986-09-09 | The Dow Chemical Company | Method for forming polymer films having bubble release surfaces |
| US5110385A (en) * | 1985-05-31 | 1992-05-05 | The Dow Chemical Company | Method for forming polymer composite films using a removable substrate |
| US4650711A (en) * | 1985-05-31 | 1987-03-17 | The Dow Chemical Company | Method for sizing polytetrafluoroethylene fabrics |
| US4784882A (en) * | 1985-05-31 | 1988-11-15 | The Dow Chemical Company | Method for forming composite polymer films |
| US4784900A (en) * | 1985-05-31 | 1988-11-15 | University Of Bath | Method for sizing polytretrafluoroethylene fabrics |
| US5114515A (en) * | 1985-05-31 | 1992-05-19 | The Dow Chemical Company | Method for forming polymer composite films using removable substrates |
| US4650551A (en) * | 1985-05-31 | 1987-03-17 | The Dow Chemical Company | Supported ion exchange membrane films |
| US4670123A (en) * | 1985-12-16 | 1987-06-02 | The Dow Chemical Company | Structural frame for an electrochemical cell |
| US4668371A (en) * | 1985-12-16 | 1987-05-26 | The Dow Chemical Company | Structural frame for an electrochemical cell |
| US4666579A (en) * | 1985-12-16 | 1987-05-19 | The Dow Chemical Company | Structural frame for a solid polymer electrolyte electrochemical cell |
| US4666580A (en) * | 1985-12-16 | 1987-05-19 | The Dow Chemical Company | Structural frame for an electrochemical cell |
| US4778723A (en) * | 1986-06-20 | 1988-10-18 | The Dow Chemical Company | Method for sizing polytetrafluoroethylene fibers, yarn, or threads |
| US4698243A (en) * | 1986-06-20 | 1987-10-06 | The Dow Chemical Company | Method for sizing and hydrolyzing polytetrafluoroethylene fabrics, fibers, yarns, or threads |
| US4731263A (en) * | 1986-09-26 | 1988-03-15 | The Dow Chemical Company | Method for the preparation of ionomer films |
| US4889577A (en) * | 1986-12-19 | 1989-12-26 | The Dow Chemical Company | Method for making an improved supported membrane/electrode structure combination wherein catalytically active particles are coated onto the membrane |
| US5039389A (en) * | 1986-12-19 | 1991-08-13 | The Dow Chemical Company | Membrane/electrode combination having interconnected roadways of catalytically active particles |
| US4738741A (en) * | 1986-12-19 | 1988-04-19 | The Dow Chemical Company | Method for forming an improved membrane/electrode combination having interconnected roadways of catalytically active particles |
| US4752370A (en) * | 1986-12-19 | 1988-06-21 | The Dow Chemical Company | Supported membrane/electrode structure combination wherein catalytically active particles are coated onto the membrane |
| GB2202551B (en) * | 1987-02-13 | 1990-12-19 | Sanden Corp | Apparatus and method for producing sodium hypochlorite |
| US4940525A (en) * | 1987-05-08 | 1990-07-10 | The Dow Chemical Company | Low equivalent weight sulfonic fluoropolymers |
| DE19908964C2 (de) * | 1998-02-27 | 2003-11-20 | Dinotec Gmbh Wassertechnologie | Verfahren zur Herstellung einer Natriumhypochloritlösung sowie Elektrolysegerät zur Durchführung dieses Verfahrens |
| US6179132B1 (en) | 1998-03-13 | 2001-01-30 | Millipore Corporation | Surface modified polymeric substrate and process |
| US6805787B2 (en) | 2001-09-07 | 2004-10-19 | Severn Trent Services-Water Purification Solutions, Inc. | Method and system for generating hypochlorite |
| JP3768160B2 (ja) | 2001-12-25 | 2006-04-19 | 三洋電機株式会社 | 水処理装置 |
| US20100276294A1 (en) * | 2003-03-28 | 2010-11-04 | Lambie John M | Electrolytic sanitization of water |
| US20050087484A1 (en) * | 2003-05-23 | 2005-04-28 | Lambie John M. | Method for electrolytic disinfection of water |
| ATE508756T1 (de) | 2004-03-05 | 2011-05-15 | Gen Probe Inc | Verfahren zur deaktivierung von nukleinsäuren |
| DE102005004063A1 (de) * | 2005-01-21 | 2006-07-27 | Alfred Kärcher Gmbh & Co. Kg | Verfahren und Vorrichtung zur Herstellung einer Alkalimetallhypochloritlösung |
| WO2006113666A2 (en) * | 2005-04-19 | 2006-10-26 | Massachusetts Institute Of Technology | Amphiphilic polymers and methods of use thereof |
| US20070007146A1 (en) * | 2005-07-07 | 2007-01-11 | Severn Trent Water Purification, Inc. | Process for producing hypochlorite |
| KR101077199B1 (ko) * | 2011-03-14 | 2011-10-27 | 김경수 | 오픈셀 방식의 차아염소산나트륨 제조장치 |
| US20140048412A1 (en) * | 2012-08-20 | 2014-02-20 | Wing-kin HUI | Electrolytic cell for generating chlorine in a pool |
| EP3259235A4 (de) * | 2013-05-15 | 2018-11-07 | Riyad, Said | Elektrochemische vorrichtung zur herstellung von desinfektionsflüssigkeitsinhalt (ozon, aktivchlor, wasserstoffperoxid) |
| US11603596B2 (en) * | 2019-03-14 | 2023-03-14 | Electrichlor, LLC | Electrolytic cell for hypochlorite generation |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2511516A (en) * | 1945-10-31 | 1950-06-13 | Western Electrochemical Compan | Process for making sodium chlorate |
| SU390016A1 (ru) * | 1971-03-15 | 1973-07-11 | Всесоюзный научно исследовательский институт электрификации сельского хоз йства | Способ получения гипохлоритов |
| US3819504A (en) * | 1972-04-28 | 1974-06-25 | Diamond Shamrock Corp | Method of maintaining cathodes of an electrolytic cell free of deposits |
| US3917518A (en) * | 1973-04-19 | 1975-11-04 | Diamond Shamrock Corp | Hypochlorite production |
| US3849281A (en) * | 1973-07-23 | 1974-11-19 | Diamond Shamrock Corp | Bipolar hypochlorite cell |
| US3884791A (en) * | 1973-11-30 | 1975-05-20 | Ppg Industries Inc | Electrolytic cell having metal electrodes |
-
1978
- 1978-01-19 CA CA295,320A patent/CA1114329A/en not_active Expired
- 1978-01-31 GB GB3769/78A patent/GB1559957A/en not_active Expired
- 1978-02-02 NL NL7801186A patent/NL7801186A/xx unknown
- 1978-02-03 US US05/875,065 patent/US4151052A/en not_active Expired - Lifetime
- 1978-02-08 ES ES466797A patent/ES466797A1/es not_active Expired
- 1978-02-15 BR BR7800889A patent/BR7800889A/pt unknown
- 1978-02-15 DE DE2806441A patent/DE2806441C3/de not_active Expired
- 1978-02-16 PT PT6766678A patent/PT67666B/pt unknown
- 1978-02-16 AR AR27112378A patent/AR215047A1/es active
- 1978-02-16 IT IT4806978A patent/IT1102383B/it active
- 1978-02-16 AU AU33351/78A patent/AU515212B2/en not_active Expired
- 1978-02-17 FR FR7804608A patent/FR2381112A1/fr active Granted
- 1978-02-17 SE SE7801873A patent/SE430176B/sv unknown
- 1978-02-17 DK DK73478A patent/DK73478A/da not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| IT7848069A0 (it) | 1978-02-16 |
| SE7801873L (sv) | 1978-08-19 |
| PT67666A (en) | 1978-03-01 |
| IT1102383B (it) | 1985-10-07 |
| BR7800889A (pt) | 1978-11-28 |
| FR2381112B1 (de) | 1980-06-20 |
| CA1114329A (en) | 1981-12-15 |
| DE2806441C3 (de) | 1981-01-22 |
| DE2806441B2 (de) | 1980-05-22 |
| NL7801186A (nl) | 1978-08-22 |
| FR2381112A1 (fr) | 1978-09-15 |
| DE2806441A1 (de) | 1978-08-24 |
| US4151052A (en) | 1979-04-24 |
| AU3335178A (en) | 1979-08-23 |
| PT67666B (en) | 1979-07-20 |
| ES466797A1 (es) | 1979-01-16 |
| GB1559957A (en) | 1980-01-30 |
| DK73478A (da) | 1978-08-19 |
| AU515212B2 (en) | 1981-03-19 |
| AR215047A1 (es) | 1979-08-31 |
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