NO139679B - PROCEDURE FOR WASTE WASTE CONTAINER CONTAINING HEAVY METAL COMPOUNDS - Google Patents
PROCEDURE FOR WASTE WASTE CONTAINER CONTAINING HEAVY METAL COMPOUNDS Download PDFInfo
- Publication number
- NO139679B NO139679B NO1361/72A NO136172A NO139679B NO 139679 B NO139679 B NO 139679B NO 1361/72 A NO1361/72 A NO 1361/72A NO 136172 A NO136172 A NO 136172A NO 139679 B NO139679 B NO 139679B
- Authority
- NO
- Norway
- Prior art keywords
- water
- waste
- heavy metal
- acetal
- metal compounds
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 8
- 229910001385 heavy metal Inorganic materials 0.000 title abstract 2
- 150000002736 metal compounds Chemical class 0.000 title abstract 2
- 239000002699 waste material Substances 0.000 title 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 150000001241 acetals Chemical class 0.000 claims description 9
- DHKHKXVYLBGOIT-UHFFFAOYSA-N acetaldehyde Diethyl Acetal Natural products CCOC(C)OCC DHKHKXVYLBGOIT-UHFFFAOYSA-N 0.000 claims description 8
- HGINCPLSRVDWNT-UHFFFAOYSA-N Acrolein Chemical compound C=CC=O HGINCPLSRVDWNT-UHFFFAOYSA-N 0.000 claims description 6
- 244000005700 microbiome Species 0.000 claims description 5
- 229920001131 Pulp (paper) Polymers 0.000 claims description 4
- 125000004432 carbon atom Chemical group C* 0.000 claims description 4
- 125000001931 aliphatic group Chemical group 0.000 claims description 2
- 125000000217 alkyl group Chemical group 0.000 claims description 2
- 239000000654 additive Substances 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 claims 1
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 claims 1
- 239000002351 wastewater Substances 0.000 abstract description 3
- 238000000746 purification Methods 0.000 abstract 1
- 150000001875 compounds Chemical class 0.000 description 7
- 239000000126 substance Substances 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 5
- 210000003097 mucus Anatomy 0.000 description 4
- -1 alum Substances 0.000 description 3
- 241001148470 aerobic bacillus Species 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 241000894007 species Species 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- MCIPQLOKVXSHTD-UHFFFAOYSA-N 3,3-diethoxyprop-1-ene Chemical compound CCOC(C=C)OCC MCIPQLOKVXSHTD-UHFFFAOYSA-N 0.000 description 1
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 1
- 229920001817 Agar Polymers 0.000 description 1
- 241000193830 Bacillus <bacterium> Species 0.000 description 1
- 241000195649 Chlorella <Chlorellales> Species 0.000 description 1
- 241000195493 Cryptophyta Species 0.000 description 1
- 241000233866 Fungi Species 0.000 description 1
- 238000012404 In vitro experiment Methods 0.000 description 1
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 239000008272 agar Substances 0.000 description 1
- 229940037003 alum Drugs 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 239000003172 expectorant agent Substances 0.000 description 1
- 230000003419 expectorant effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 1
- 241001148471 unidentified anaerobic bacterium Species 0.000 description 1
Classifications
-
- 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
- C02F1/70—Treatment of water, waste water, or sewage by reduction
- C02F1/705—Reduction by metals
-
- 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
- C02F1/46176—Galvanic cells
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/02—Non-contaminated water, e.g. for industrial water supply
- C02F2103/023—Water in cooling circuits
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Removal Of Specific Substances (AREA)
- Water Treatment By Sorption (AREA)
Abstract
Fremgangsmåte for rensing av avfallsvann som inneholder tungmetallforbindelser.Process for the purification of waste water containing heavy metal compounds.
Description
Fremgangsmåte til bekjempelse av slimdannende mikroorganismer i vann til bruk i industrien. Method for combating slime-forming microorganisms in water for use in industry.
Foreliggende oppfinnelse angår en The present invention relates to a
fremgangsmåte til bekjempelse av slimdannende mikroorganismer i vann til bruk method for combating slime-forming microorganisms in water for use
i industrien, særlig til bekjempelse av pa-pirslimdannelse. Papirslim utgjør et av de in industry, in particular to combat paper glue formation. Paper glue is one of them
alvorligste problemer ved papirfremstillingen fordi det forårsaker flekker, hull og most serious problems in papermaking because it causes spots, holes and
sprekker i papiret og ofte bevirker en dår-lig arkdannelse. Det samler seg på siler, cracks in the paper and often causes poor sheet formation. It collects on sieves,
tråder (wire) og andre innretninger, slik threads (wire) and other devices, such
at hyppige rengjøringsperioder er påkre-vet, hvilke forårsaker produksjonstap. Med that frequent cleaning periods are required, which cause production losses. With
denøkede anvendelse av vann som på for-hånd har vært anvendt til papirfremstil-lingsmetoder, ble betydningen av et øko-nomisk, men effektivt anti-slim-middel the increased use of water which has previously been used for papermaking methods, the importance of an economical but effective anti-slime agent became
mer og mer innlysende. more and more obvious.
Ved papirfremstillingen tilberedes mas-sene først i form av en vandig oppløsning During paper production, the pulp is first prepared in the form of an aqueous solution
som overføres til papirark ved følgende tre which is transferred to paper sheets by the following tree
viktige trinn: important steps:
1. den vilkårlige orientering av fibrene i suspensjon i form av en våt bane: 2. fjernelse av en del av det frie vann fra den våte bane ved vektbelastning eller 1. the arbitrary orientation of the fibers in suspension in the form of a wet web: 2. the removal of part of the free water from the wet web by weight loading or
pressing, og pressing, and
3. den fortsatte fjernelse av vannet ved 3. the continued removal of the water by
opphetning. heating.
Det i første trinn avløpende eller i That in the first stage draining or in
annet trinn uttrukne vann er, som allerede antydet, kjent under navnet avvann Second-stage extracted water is, as already indicated, known as waste water
(«white water»). Dette inneholder en nev-neverdig mengde fibre sammen med vann-oppløselige stoffer, såsom stivelse, kolofo-nium, alun, farvestoffer etc. ("white water"). This contains a significant amount of fibers together with water-soluble substances, such as starch, rosin, alum, dyes, etc.
Ifølge oppfinnelsen anvendes som According to the invention is used as
slimbekjempende middel acetaler med den expectorant acetals with it
generelle formel: general formula:
hvor R angir en alifatisk gruppe med høyst 10 kullstoff atomer, fortrinnsvis en alkyi-gruppe med høyst 5 kullstoffatomer. Særlig gode resultater oppnås ved anvendelsen av dietylacetal av acrolein. where R denotes an aliphatic group with no more than 10 carbon atoms, preferably an alkyl group with no more than 5 carbon atoms. Particularly good results are obtained with the use of diethyl acetal of acrolein.
Mengden av det ifølge oppfinnelsen anvendte acetal kan variere betraktelig. I visse tilfelle kan det allerede være virk-somt ved en konsentrasjon på 1 g/t vann, men mange ganger kreves også omkring 50 g/t eller endog større mengder. Oftest ligger imidlertid den virksomme konsentrasjon mellom 5 og 20 g/t. The amount of acetal used according to the invention can vary considerably. In certain cases, it can already be effective at a concentration of 1 g/t of water, but many times around 50 g/t or even larger amounts are also required. Most often, however, the effective concentration is between 5 and 20 g/h.
Den virksomme forbindelse kan tilsettes vannet kontinuerlig eller eventuelt i doser. Det er mulig å tilsette vannet forbindelsen før papirfremstillingen begynner, under papirfremstillingen eller eventuelt L det brukte avvannn som ansees ubrukbart 3tter papirfremstillingen, for å nedsette ytterligere slimdannelse. De til formålet Ifølge oppfinnelsen anvendte acetaler er særlig fordelaktige fordi de ikke etterlater noen rester på papirarkene, mens de hittil for papirfremstillingen som antislim-mid-3el anvendte kjemikalier ofte etterlater en aønsket rest. Den usedvanlige virkning av forbindelsen ifølge oppfinnelsen ble påvist /ed et forsøk hvor en hvitlut fra en igang-værende papirfabrikk ble fyllt på flasker ned skrukapsel. Luten inneholdt forskjel-ige mengder acroleindietylacetal. Etterat prøvene hadde «klekket» i 48 timer ved 37° ble der ved hjelp av en trådløkke tatt ut ;n liten materialprøve av hver flaske og itrøket ut på plater overtrukket med agar. Platene ble deretter oppbevart ytterligere 48 timer ved 37° C og til slutt nøye iakt-tatt for å konstatere tilstedeværelsen av eller mangelen på slim. Det viste seg at en konsentrasjon av det tilførte acetal på 10 mg/kg var tilstrekkelig til helt å under-trykke slimdannelsen. The active compound can be added to the water continuously or possibly in doses. It is possible to add the compound to the water before the paper manufacture begins, during the paper manufacture or possibly to the used waste water which is considered unusable after the paper manufacture, in order to reduce further slime formation. The acetals used for the purpose according to the invention are particularly advantageous because they do not leave any residue on the paper sheets, while the chemicals hitherto used for paper production as anti-sliming agents often leave a desired residue. The extraordinary effect of the compound according to the invention was demonstrated in an experiment where a white liquor from an ongoing paper factory was filled into screw-cap bottles. The lye contained varying amounts of acrolein diethyl acetal. After the samples had "hatched" for 48 hours at 37°, a small material sample was taken out of each bottle using a wire loop and spread onto plates coated with agar. The plates were then kept for a further 48 hours at 37°C and finally carefully observed to ascertain the presence or absence of mucus. It turned out that a concentration of the added acetal of 10 mg/kg was sufficient to completely suppress mucus formation.
Da det slim som dannes i maskiner for tremasse- og papir-fremstilling for det meste kan føres tilbake til aerobe bakterier av artene aerobacter og bacillus, ble der foretatt in vitro-forsøk som viste acro-leinacetalenes overordentlige virkning overfor mikroorganismer, såsom aerobe og anaerobe bakterier. Disse forsøk viste at disse acetaler er virksomme overfor ty-piske representanter for mikro-organis-mer som kan forekomme i det for tremasse- og papirfabrikasjonen anvendte vann, samt overfor visse sopp- og alge-ar-ter. Resultatene av disse forsøk er sam-mensatt i følgende tabell: As the mucus formed in pulp and paper-making machines can mostly be traced back to aerobic bacteria of the species aerobacter and bacillus, in vitro experiments were carried out that showed the extraordinary effect of acrolein acetals against microorganisms, such as aerobic and anaerobic bacteria. These tests showed that these acetals are effective against typical representatives of micro-organisms that can occur in the water used for wood pulp and paper manufacture, as well as against certain species of fungi and algae. The results of these tests are compiled in the following table:
Algen chlorella ble undertrykket av acroleindiallylacetal ved en konsentrasjon på 10 mg/kg. The alga chlorella was suppressed by acrolein diallyl acetal at a concentration of 10 mg/kg.
De aktive forbindelser som ifølge oppfinnelsen skal anvendes, kan tilsettes alene eller i form av en oppløsning, fortrinnsvis en vandig oppløsning, en egnet emulsjon henholdsvis suspensjon og eventuelt sammen med andre slimforebyggende midler. Det er også mulig å anvende forbindelsen ifølge oppfinnelsen med kjemikalier som virker i retning av å forandre henholdsvis modifisere strekk-fastheten, særlig vannfastheten, sugeevnen, farven, strukturen (texturen), fettbestandigheten, glansen og trykkeevnen for det ferdige produkt. Der-for kan forbindelsen ifølge oppfinnelsen for forbedring av vannfastheten forenes med visse ikke-reaksjonsdyktige kunststoffer. Andre kombinasjoner av kjemikalier med det slimbekjempende middel ifølge oppfinnelsen er uten videre innlysende for en fagmann, idet det dog skal fremheves at de nevnte kombinasjoner av slimbekjempende middel ifølge oppfinnelsen med kjemikalier anvendt for fremstilling av tremasse eller papir ikke er begrenset til de nevnte funksjoner av disse eller andre spesielle kjemikalier. The active compounds that are to be used according to the invention can be added alone or in the form of a solution, preferably an aqueous solution, a suitable emulsion or suspension and possibly together with other mucus prevention agents. It is also possible to use the compound according to the invention with chemicals that act in the direction of changing or modifying the tensile strength, in particular the water resistance, absorbency, colour, structure (texture), grease resistance, gloss and printability of the finished product. Therefore, the compound according to the invention for improving the water resistance can be combined with certain non-reactive plastics. Other combinations of chemicals with the slime-fighting agent according to the invention are readily apparent to a person skilled in the art, although it must be emphasized that the mentioned combinations of slime-fighting agent according to the invention with chemicals used for the production of wood pulp or paper are not limited to the aforementioned functions of these or other special chemicals.
Selvom anvendelsen av forbindelsen ifølge oppfinnelsen for bekjempelse av slimdannelse i vann til bruk i industrien ble spesielt nevnt for tremasse- og papirfabrikasjonen, er det en selvfølge at de nevnte acetaler med godt resultat også kan anvendes til bekjempelse av slim i vann for andre industrier, såsom tekstil-industri. Although the use of the compound according to the invention for combating slime formation in water for use in industry was specifically mentioned for wood pulp and paper manufacturing, it goes without saying that the mentioned acetals can also be used with good results to combat slime in water for other industries, such as textile industry.
Claims (3)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT2354971 | 1971-04-23 | ||
| IT2420571 | 1971-05-07 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NO139679B true NO139679B (en) | 1979-01-15 |
| NO139679C NO139679C (en) | 1979-04-25 |
Family
ID=26328395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO1361/72A NO139679C (en) | 1971-04-23 | 1972-04-19 | PROCEDURE FOR WASTE WASTE CONTAINER CONTAINING HEAVY METAL COMPOUNDS |
Country Status (24)
| Country | Link |
|---|---|
| JP (1) | JPS5235945B1 (en) |
| AT (1) | AT324969B (en) |
| BE (1) | BE782358A (en) |
| CA (1) | CA1028278A (en) |
| CH (1) | CH539001A (en) |
| CS (1) | CS178869B2 (en) |
| DD (1) | DD96694A5 (en) |
| DE (1) | DE2219095A1 (en) |
| DK (1) | DK142049C (en) |
| ES (1) | ES402789A1 (en) |
| FI (1) | FI62810C (en) |
| FR (1) | FR2133922B1 (en) |
| GB (1) | GB1376998A (en) |
| HU (1) | HU164830B (en) |
| IE (1) | IE36316B1 (en) |
| IL (1) | IL39131A (en) |
| LU (1) | LU65207A1 (en) |
| NL (1) | NL153829B (en) |
| NO (1) | NO139679C (en) |
| PL (1) | PL83655B1 (en) |
| RO (1) | RO63778A (en) |
| SE (1) | SE386153B (en) |
| TR (1) | TR17282A (en) |
| YU (1) | YU36674B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2430848C2 (en) * | 1974-06-27 | 1986-02-27 | Levrini, Valter, Castellarano | Process for the chemical purification of waste water |
| CH649976A5 (en) * | 1981-03-05 | 1985-06-28 | Hans Lueber | DEVICE FOR LIMESTONE PREVENTION IN WATER TANKS. |
| US4525254A (en) * | 1982-10-07 | 1985-06-25 | Gosudarstvenny Nauchno-Issledovatelsky I Proektny Institut Po Obogascheniju Rud Tsvetnykh Metallov "Kazmekhanobr" | Process and apparatus for purifying effluents and liquors |
| DE10005681B4 (en) * | 2000-02-07 | 2005-06-16 | Atc Dr. Mann E.K. | Method and device for the decontamination of metal-containing waters |
| CN115418483B (en) * | 2022-08-30 | 2023-06-30 | 中南大学 | Method for preparing ferrochrome from chromium-containing waste liquid |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1459451A1 (en) * | 1962-05-29 | 1968-12-19 | Asendorf Dr Erich | Process for removing copper from sulfuric acid and nitric acid waste water with simultaneous destruction of water-insoluble copper compounds |
| AT240059B (en) * | 1963-08-02 | 1965-05-10 | Donau Chemie Ag | Process for the electrolytic deposition of sulfo-salt-forming metals |
| US3392102A (en) * | 1967-03-16 | 1968-07-09 | Koch Rudolf | Galvanic action water purifier |
-
1972
- 1972-04-03 IL IL39131A patent/IL39131A/en unknown
- 1972-04-19 NO NO1361/72A patent/NO139679C/en unknown
- 1972-04-19 YU YU1051/72A patent/YU36674B/en unknown
- 1972-04-19 DE DE19722219095 patent/DE2219095A1/en active Pending
- 1972-04-20 FR FR7213901A patent/FR2133922B1/fr not_active Expired
- 1972-04-20 BE BE782358A patent/BE782358A/en not_active IP Right Cessation
- 1972-04-21 LU LU65207D patent/LU65207A1/xx unknown
- 1972-04-21 IE IE532/72A patent/IE36316B1/en unknown
- 1972-04-21 CA CA140,318A patent/CA1028278A/en not_active Expired
- 1972-04-21 HU HUSA2348A patent/HU164830B/hu unknown
- 1972-04-21 FI FI1138/72A patent/FI62810C/en active
- 1972-04-21 GB GB1874072A patent/GB1376998A/en not_active Expired
- 1972-04-21 DK DK197372A patent/DK142049C/en not_active IP Right Cessation
- 1972-04-21 RO RO7200070638A patent/RO63778A/en unknown
- 1972-04-21 DD DD162482A patent/DD96694A5/xx unknown
- 1972-04-21 PL PL1972154899A patent/PL83655B1/pl unknown
- 1972-04-21 SE SE7205294A patent/SE386153B/en unknown
- 1972-04-21 CS CS7200002717A patent/CS178869B2/en unknown
- 1972-04-22 CH CH592572A patent/CH539001A/en not_active IP Right Cessation
- 1972-04-22 ES ES402789A patent/ES402789A1/en not_active Expired
- 1972-04-24 AT AT360072A patent/AT324969B/en not_active IP Right Cessation
- 1972-04-24 TR TR17282A patent/TR17282A/en unknown
- 1972-04-24 NL NL727205539A patent/NL153829B/en not_active IP Right Cessation
- 1972-04-24 JP JP47040486A patent/JPS5235945B1/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| IE36316B1 (en) | 1976-10-13 |
| TR17282A (en) | 1975-03-24 |
| RO63778A (en) | 1978-10-15 |
| SE386153B (en) | 1976-08-02 |
| IL39131A (en) | 1975-08-31 |
| BE782358A (en) | 1972-08-16 |
| NL7205539A (en) | 1972-10-25 |
| GB1376998A (en) | 1974-12-11 |
| NL153829B (en) | 1977-07-15 |
| CS178869B2 (en) | 1977-10-31 |
| CA1028278A (en) | 1978-03-21 |
| YU36674B (en) | 1984-08-31 |
| DK142049B (en) | 1980-08-18 |
| JPS5235945B1 (en) | 1977-09-12 |
| AT324969B (en) | 1975-09-25 |
| PL83655B1 (en) | 1975-12-31 |
| DD96694A5 (en) | 1973-04-05 |
| CH539001A (en) | 1973-07-15 |
| YU105172A (en) | 1982-02-25 |
| HU164830B (en) | 1974-04-11 |
| DE2219095A1 (en) | 1972-11-16 |
| FR2133922A1 (en) | 1972-12-01 |
| NO139679C (en) | 1979-04-25 |
| IE36316L (en) | 1972-10-23 |
| FI62810C (en) | 1983-03-10 |
| FR2133922B1 (en) | 1974-10-18 |
| LU65207A1 (en) | 1972-07-13 |
| FI62810B (en) | 1982-11-30 |
| ES402789A1 (en) | 1975-10-16 |
| DK142049C (en) | 1981-01-12 |
| IL39131A0 (en) | 1972-06-28 |
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