FI60850C - Foerfarande foer kontinuerligt framstaellande av svavelsyra som aer i huvudsak fri fraon kvicksilver - Google Patents
Foerfarande foer kontinuerligt framstaellande av svavelsyra som aer i huvudsak fri fraon kvicksilver Download PDFInfo
- Publication number
- FI60850C FI60850C FI2443/72A FI244372A FI60850C FI 60850 C FI60850 C FI 60850C FI 2443/72 A FI2443/72 A FI 2443/72A FI 244372 A FI244372 A FI 244372A FI 60850 C FI60850 C FI 60850C
- Authority
- FI
- Finland
- Prior art keywords
- mercury
- acid
- tower
- gas
- sulfuric acid
- Prior art date
Links
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 213
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 191
- 229910052753 mercury Inorganic materials 0.000 claims description 191
- 239000002253 acid Substances 0.000 claims description 172
- 239000007789 gas Substances 0.000 claims description 111
- 238000010521 absorption reaction Methods 0.000 claims description 97
- 238000000034 method Methods 0.000 claims description 41
- 238000005406 washing Methods 0.000 claims description 23
- 229910052751 metal Inorganic materials 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 18
- 238000004519 manufacturing process Methods 0.000 claims description 16
- 239000012535 impurity Substances 0.000 claims description 14
- 238000001556 precipitation Methods 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 10
- 239000000428 dust Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- 229910052717 sulfur Inorganic materials 0.000 claims description 7
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 3
- 150000003346 selenoethers Chemical class 0.000 claims description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 2
- 238000010924 continuous production Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 150000002739 metals Chemical class 0.000 claims description 2
- 239000011593 sulfur Substances 0.000 claims description 2
- 239000003599 detergent Substances 0.000 claims 2
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 claims 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims 1
- 229910052700 potassium Inorganic materials 0.000 claims 1
- 239000011591 potassium Substances 0.000 claims 1
- 230000001376 precipitating effect Effects 0.000 claims 1
- 150000003568 thioethers Chemical class 0.000 claims 1
- 238000001035 drying Methods 0.000 description 45
- 238000000926 separation method Methods 0.000 description 34
- 239000003153 chemical reaction reagent Substances 0.000 description 31
- 238000001914 filtration Methods 0.000 description 23
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 18
- 238000002474 experimental method Methods 0.000 description 15
- 229910052979 sodium sulfide Inorganic materials 0.000 description 14
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 description 14
- 239000000047 product Substances 0.000 description 10
- 239000011734 sodium Substances 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 239000010949 copper Substances 0.000 description 9
- 239000002244 precipitate Substances 0.000 description 9
- 229910001868 water Inorganic materials 0.000 description 9
- 239000005909 Kieselgur Substances 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000001816 cooling Methods 0.000 description 7
- 229910052802 copper Inorganic materials 0.000 description 7
- 239000011701 zinc Substances 0.000 description 7
- 229910052711 selenium Inorganic materials 0.000 description 6
- 239000011669 selenium Substances 0.000 description 6
- 238000003860 storage Methods 0.000 description 6
- QXKXDIKCIPXUPL-UHFFFAOYSA-N sulfanylidenemercury Chemical compound [Hg]=S QXKXDIKCIPXUPL-UHFFFAOYSA-N 0.000 description 6
- 229910052725 zinc Inorganic materials 0.000 description 6
- DOBUSJIVSSJEDA-UHFFFAOYSA-L 1,3-dioxa-2$l^{6}-thia-4-mercuracyclobutane 2,2-dioxide Chemical compound [Hg+2].[O-]S([O-])(=O)=O DOBUSJIVSSJEDA-UHFFFAOYSA-L 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 5
- 238000005201 scrubbing Methods 0.000 description 5
- 229910052709 silver Inorganic materials 0.000 description 5
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 229910000370 mercury sulfate Inorganic materials 0.000 description 4
- 239000006199 nebulizer Substances 0.000 description 4
- 239000004332 silver Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910001431 copper ion Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910001385 heavy metal Inorganic materials 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- -1 mercury Chemical compound 0.000 description 3
- YQMLDSWXEQOSPP-UHFFFAOYSA-N selanylidenemercury Chemical compound [Hg]=[Se] YQMLDSWXEQOSPP-UHFFFAOYSA-N 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- 229910000497 Amalgam Inorganic materials 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- 239000005083 Zinc sulfide Substances 0.000 description 2
- 229910052785 arsenic Inorganic materials 0.000 description 2
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 2
- 239000011133 lead Substances 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000012255 powdered metal Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- KDYFGRWQOYBRFD-UHFFFAOYSA-N succinic acid Chemical compound OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 description 2
- 230000019635 sulfation Effects 0.000 description 2
- 238000005670 sulfation reaction Methods 0.000 description 2
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 description 2
- 101100352919 Caenorhabditis elegans ppm-2 gene Proteins 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 239000005569 Iron sulphate Substances 0.000 description 1
- 229910052778 Plutonium Inorganic materials 0.000 description 1
- FOIXSVOLVBLSDH-UHFFFAOYSA-N Silver ion Chemical compound [Ag+] FOIXSVOLVBLSDH-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 241001122767 Theaceae Species 0.000 description 1
- 229910052946 acanthite Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 description 1
- 229910000366 copper(II) sulfate Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 150000002222 fluorine compounds Chemical class 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 229910052981 lead sulfide Inorganic materials 0.000 description 1
- 229940056932 lead sulfide Drugs 0.000 description 1
- 150000002730 mercury Chemical class 0.000 description 1
- VPCVQOUFBWWQSL-UHFFFAOYSA-L mercury(2+);selenate Chemical compound [Hg+2].[O-][Se]([O-])(=O)=O VPCVQOUFBWWQSL-UHFFFAOYSA-L 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000000546 pharmaceutical excipient Substances 0.000 description 1
- OYEHPCDNVJXUIW-UHFFFAOYSA-N plutonium atom Chemical compound [Pu] OYEHPCDNVJXUIW-UHFFFAOYSA-N 0.000 description 1
- 238000011045 prefiltration Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- FSJWWSXPIWGYKC-UHFFFAOYSA-M silver;silver;sulfanide Chemical compound [SH-].[Ag].[Ag+] FSJWWSXPIWGYKC-UHFFFAOYSA-M 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000001384 succinic acid Substances 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 1
- 229910052984 zinc sulfide Inorganic materials 0.000 description 1
- 239000011686 zinc sulphate Substances 0.000 description 1
- 235000009529 zinc sulphate Nutrition 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
- C01B17/00—Sulfur; Compounds thereof
- C01B17/48—Sulfur dioxide; Sulfurous acid
- C01B17/50—Preparation of sulfur dioxide
- C01B17/56—Separation; Purification
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Treating Waste Gases (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Manufacture And Refinement Of Metals (AREA)
Applications Claiming Priority (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7062571A JPS4836092A (en, 2012) | 1971-09-10 | 1971-09-10 | |
| JP7062571 | 1971-09-10 | ||
| JP2082072A JPS5229272B2 (en, 2012) | 1972-02-28 | 1972-02-28 | |
| JP2082072 | 1972-02-28 | ||
| JP2138472 | 1972-02-29 | ||
| JP2138472A JPS5027478B2 (en, 2012) | 1972-02-29 | 1972-02-29 | |
| JP4163372A JPS5139197B2 (en, 2012) | 1972-04-24 | 1972-04-24 | |
| JP4163372 | 1972-04-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FI60850B FI60850B (fi) | 1981-12-31 |
| FI60850C true FI60850C (fi) | 1982-04-13 |
Family
ID=27457464
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FI2443/72A FI60850C (fi) | 1971-09-10 | 1972-09-05 | Foerfarande foer kontinuerligt framstaellande av svavelsyra som aer i huvudsak fri fraon kvicksilver |
Country Status (13)
| Country | Link |
|---|---|
| US (1) | US3954451A (en, 2012) |
| AU (1) | AU477154B2 (en, 2012) |
| BE (1) | BE788615A (en, 2012) |
| CA (1) | CA986685A (en, 2012) |
| DE (1) | DE2243577C3 (en, 2012) |
| FI (1) | FI60850C (en, 2012) |
| FR (1) | FR2152807B1 (en, 2012) |
| GB (1) | GB1410032A (en, 2012) |
| IT (1) | IT968320B (en, 2012) |
| NL (1) | NL7212277A (en, 2012) |
| NO (1) | NO136489C (en, 2012) |
| SE (1) | SE394659C (en, 2012) |
| ZM (1) | ZM14572A1 (en, 2012) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4057423A (en) * | 1971-09-10 | 1977-11-08 | Mitsui Mining & Smelting Co., Ltd. | Method for the manufacture of mercury free sulfuric acid |
| US4044098A (en) * | 1976-05-18 | 1977-08-23 | Phillips Petroleum Company | Removal of mercury from gas streams using hydrogen sulfide and amines |
| FI62002C (fi) * | 1981-04-15 | 1982-11-10 | Outokumpu Oy | Foerfarande och anordning foer separering av kvicksilver ur svveldioxidhaltiga heta och fuktiga gaser |
| LU83715A1 (fr) * | 1981-10-26 | 1983-06-07 | Metallurgie Hoboken | Procede pour fabriquer de l'acide sulfurique |
| SE439153B (sv) * | 1982-12-03 | 1985-06-03 | Boliden Ab | Forfarande vid produktion av svavelsyra ur svaveldioxidhaltig gas herrorande fran behandling av kvicksilverinnehallande ravaror och mellanprodukter |
| SE439154B (sv) * | 1982-12-03 | 1985-06-03 | Boliden Ab | Forfarande vid produktion av svavelsyra ur svaveldioxidhaltig gas |
| US5711929A (en) * | 1989-05-06 | 1998-01-27 | 698638 Alberta Ltd. | Purification of elemental sulphur |
| GB8912861D0 (en) * | 1989-06-05 | 1989-07-26 | Sherritt Gordon Ltd | Purification of elemental sulphur |
| DE4436019C2 (de) * | 1994-10-08 | 1999-04-22 | Metallgesellschaft Ag | Verfahren zur Herstellung von schwermetallfreier Schwefelsäure aus SO¶2¶-haltigen Gasen |
| ES2097699B1 (es) * | 1994-10-26 | 1997-12-16 | Asturiana De Zinc Sa | Procedimiento continuo para la captacion y precipitacion simultanea de mercurio en gases que lo contienen. |
| FI117617B (fi) * | 2000-12-08 | 2006-12-29 | Outokumpu Oy | Menetelmä elohopean poistamiseksi kaasusta |
| US20050207955A1 (en) * | 2004-03-17 | 2005-09-22 | Bo Wang | Mercury adsorbent composition, process of making same and method of separating mercury from fluids |
| CN112174098B (zh) * | 2020-09-29 | 2022-05-03 | 安徽华铂再生资源科技有限公司 | 一种低温制冷机组在低气浓制酸系统中的应用方法 |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US940595A (en) * | 1906-02-10 | 1909-11-16 | Gen Chemical Corp | Purification of burner-gases. |
| US935337A (en) * | 1908-07-08 | 1909-09-28 | John Herbert Thwaites | Wet method of separating metallic compounds. |
| US1915270A (en) * | 1930-03-21 | 1933-06-27 | Catalytic Process Corp | Process of making contact sulphuric acid |
| GB742052A (en) * | 1951-04-05 | 1955-12-21 | Alfons Zieren | Improvements relating to the washing and cooling of gases containing sulphur dioxide |
| US2846305A (en) * | 1954-04-05 | 1958-08-05 | American Cyanamid Co | Separation and recovery of mercury |
| DE1054972B (de) * | 1957-05-08 | 1959-04-16 | Goldschmidt Ag Th | Verfahren zur Herstellung von weitgehend quecksilberfreier Schwefelsaeure |
| US2958572A (en) * | 1957-05-20 | 1960-11-01 | Monsanto Chemicals | Separation of selenium compounds from sulfur trioxide |
| US3145080A (en) * | 1960-11-15 | 1964-08-18 | Basf Ag | Purification of dilute commercial sulfuric acid |
| US3147074A (en) * | 1961-09-18 | 1964-09-01 | Chemical Construction Corp | Sulfuric acid process |
| DE1216263B (de) * | 1964-05-23 | 1966-05-12 | Vni Gorno Metall I Zwetnych Me | Verfahren zur Abtrennung des Quecksilbers aus konzentrierter Schwefelsaeure |
| SE334598B (en, 2012) * | 1969-09-01 | 1971-05-03 | Boliden Ab | |
| DE1954828B2 (de) * | 1969-10-31 | 1974-07-18 | Chemische Werke Huels Ag, 4370 Marl | Verfahren zur Verringerung der Quecksilber-Verluste bei der Chlor-Alkali-Elektrolyse nach dem Amalgam-Verfahren |
| US3701651A (en) * | 1970-02-06 | 1972-10-31 | Al Hack & Associates Inc | Process for production of mercury |
| US3689217A (en) * | 1970-06-15 | 1972-09-05 | Inventa Ag | Process for freeing 55-85% sulphuric acid from its impurities due to metals and/or semi-metals |
| FI45767C (fi) * | 1970-07-03 | 1972-09-11 | Outokumpu Oy | Menetelmä elohopean ja/tai seleenin poistamiseksi ja talteenottamiseks i elohopea- ja/tai seleenipitoisista kaasuista. |
| US3826819A (en) * | 1972-04-21 | 1974-07-30 | Bunker Hill Co | Sulfuric acid purification process |
-
0
- BE BE788615D patent/BE788615A/xx unknown
-
1972
- 1972-09-04 AU AU46265/72A patent/AU477154B2/en not_active Expired
- 1972-09-05 FI FI2443/72A patent/FI60850C/fi active
- 1972-09-05 DE DE2243577A patent/DE2243577C3/de not_active Expired
- 1972-09-06 CA CA151,082A patent/CA986685A/en not_active Expired
- 1972-09-06 US US05/286,712 patent/US3954451A/en not_active Expired - Lifetime
- 1972-09-06 SE SE7211517A patent/SE394659C/xx unknown
- 1972-09-08 IT IT69845/72A patent/IT968320B/it active
- 1972-09-08 NL NL7212277A patent/NL7212277A/xx unknown
- 1972-09-08 FR FR7231993A patent/FR2152807B1/fr not_active Expired
- 1972-09-08 NO NO3191/72A patent/NO136489C/no unknown
- 1972-09-11 GB GB4202072A patent/GB1410032A/en not_active Expired
- 1972-09-11 ZM ZM145/72*UA patent/ZM14572A1/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| SE394659C (sv) | 1979-06-05 |
| DE2243577C3 (de) | 1980-02-14 |
| IT968320B (it) | 1974-03-20 |
| NO136489C (no) | 1977-09-14 |
| CA986685A (en) | 1976-04-06 |
| NL7212277A (en, 2012) | 1973-03-13 |
| NO136489B (en, 2012) | 1977-06-06 |
| DE2243577A1 (de) | 1973-03-15 |
| FR2152807B1 (en, 2012) | 1975-01-03 |
| US3954451A (en) | 1976-05-04 |
| DE2243577B2 (de) | 1979-06-21 |
| FI60850B (fi) | 1981-12-31 |
| GB1410032A (en) | 1975-10-15 |
| ZM14572A1 (en) | 1973-06-21 |
| AU4626572A (en) | 1974-03-14 |
| SE394659B (sv) | 1977-07-04 |
| BE788615A (fr) | 1973-01-02 |
| AU477154B2 (en) | 1976-10-14 |
| FR2152807A1 (en, 2012) | 1973-04-27 |
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