FI56490C - Foerfarande foer avlaegsnande av gasformiga foeroreningar ur svavelsyrakontaktanordningars avgaser - Google Patents
Foerfarande foer avlaegsnande av gasformiga foeroreningar ur svavelsyrakontaktanordningars avgaser Download PDFInfo
- Publication number
- FI56490C FI56490C FI1370/74A FI137074A FI56490C FI 56490 C FI56490 C FI 56490C FI 1370/74 A FI1370/74 A FI 1370/74A FI 137074 A FI137074 A FI 137074A FI 56490 C FI56490 C FI 56490C
- Authority
- FI
- Finland
- Prior art keywords
- acid
- sulfuric acid
- venturin
- sump
- tower
- Prior art date
Links
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 115
- 239000002253 acid Substances 0.000 claims description 87
- 239000007789 gas Substances 0.000 claims description 46
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 33
- 239000001301 oxygen Substances 0.000 claims description 32
- 229910052760 oxygen Inorganic materials 0.000 claims description 32
- 238000005406 washing Methods 0.000 claims description 32
- 230000003647 oxidation Effects 0.000 claims description 27
- 238000007254 oxidation reaction Methods 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 23
- 230000007062 hydrolysis Effects 0.000 claims description 14
- 238000006460 hydrolysis reaction Methods 0.000 claims description 14
- 150000002978 peroxides Chemical class 0.000 claims description 11
- 239000000945 filler Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 6
- 238000012432 intermediate storage Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 150000003464 sulfur compounds Chemical class 0.000 claims description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 2
- 239000006096 absorbing agent Substances 0.000 claims description 2
- 229910017604 nitric acid Inorganic materials 0.000 claims description 2
- LDVVMCZRFWMZSG-UHFFFAOYSA-N captan Chemical compound C1C=CCC2C(=O)N(SC(Cl)(Cl)Cl)C(=O)C21 LDVVMCZRFWMZSG-UHFFFAOYSA-N 0.000 claims 22
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims 2
- 238000002347 injection Methods 0.000 claims 2
- 239000007924 injection Substances 0.000 claims 2
- 238000009795 derivation Methods 0.000 claims 1
- 239000004310 lactic acid Substances 0.000 claims 1
- 235000014655 lactic acid Nutrition 0.000 claims 1
- 238000005201 scrubbing Methods 0.000 description 13
- 239000000047 product Substances 0.000 description 11
- 230000001413 cellular effect Effects 0.000 description 9
- 238000010521 absorption reaction Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 235000011149 sulphuric acid Nutrition 0.000 description 5
- 238000005868 electrolysis reaction Methods 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910000372 mercury(II) sulfate Inorganic materials 0.000 description 2
- FHHJDRFHHWUPDG-UHFFFAOYSA-N peroxysulfuric acid Chemical compound OOS(O)(=O)=O FHHJDRFHHWUPDG-UHFFFAOYSA-N 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- RVMFLWODSKUVCY-UHFFFAOYSA-N methylazanium;sulfite Chemical compound NC.NC.OS(O)=O RVMFLWODSKUVCY-UHFFFAOYSA-N 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 150000004965 peroxy acids Chemical class 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000012265 solid product Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
- 229940078499 tricalcium phosphate Drugs 0.000 description 1
- 229910000391 tricalcium phosphate Inorganic materials 0.000 description 1
- 235000019731 tricalcium phosphate Nutrition 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/10—Venturi scrubbers
-
- 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
- C01B17/69—Sulfur trioxide; Sulfuric acid
- C01B17/74—Preparation
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Treating Waste Gases (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2322982 | 1973-05-08 | ||
| DE2322982A DE2322982C3 (de) | 1973-05-08 | 1973-05-08 | Verfahren zur Entfernung von gasförmigen Verunreinigungen aus Abgasen von Schwefelsäurekontaktanlagen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FI56490B FI56490B (fi) | 1979-10-31 |
| FI56490C true FI56490C (fi) | 1980-02-11 |
Family
ID=5880207
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FI1370/74A FI56490C (fi) | 1973-05-08 | 1974-05-06 | Foerfarande foer avlaegsnande av gasformiga foeroreningar ur svavelsyrakontaktanordningars avgaser |
Country Status (15)
| Country | Link |
|---|---|
| US (1) | US3944401A (de) |
| JP (2) | JPS5018384A (de) |
| AT (1) | AT333784B (de) |
| BE (1) | BE814693R (de) |
| CA (1) | CA1019540A (de) |
| CH (1) | CH576803A5 (de) |
| DE (1) | DE2322982C3 (de) |
| ES (1) | ES424676A2 (de) |
| FI (1) | FI56490C (de) |
| FR (1) | FR2228528B2 (de) |
| GB (1) | GB1465371A (de) |
| IT (1) | IT1046117B (de) |
| NL (1) | NL182213C (de) |
| SE (1) | SE412994B (de) |
| ZA (1) | ZA742211B (de) |
Families Citing this family (44)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2505828C3 (de) * | 1975-02-12 | 1980-06-12 | Sued-Chemie Ag, 8000 Muenchen | Verfahren und Vorrichtung zur Erzeugung von konzentrierter Schwefelsäure und/oder Oleum |
| DE2519928C3 (de) * | 1975-05-05 | 1981-04-02 | Metallgesellschaft Ag, 6000 Frankfurt | Verfahren zur Herstellung von Schwefelsäure |
| CA1059943A (en) * | 1976-07-20 | 1979-08-07 | Noranda Mines Limited | Electrolytically forming peroxosulfuric acid to oxidize organic material in sulfuric acid |
| US4256468A (en) * | 1977-12-28 | 1981-03-17 | Bethlehem Steel Corporation | Method for cleaning sinter plant gas emissions |
| US4409064A (en) * | 1978-10-16 | 1983-10-11 | Air Products And Chemicals, Inc. | Process for concentrating sulfuric acid in an evaporator |
| DE2945021A1 (de) * | 1979-11-08 | 1981-05-21 | Metallgesellschaft Ag, 6000 Frankfurt | Verfahren zur herstellung von konzentrierter schwefelsaeure |
| DE3008718C2 (de) * | 1980-03-07 | 1987-01-22 | Hölter, Heinz, Dipl.-Ing., 4390 Gladbeck | Vorrichtung zur Gaswäsche für Chemisorptionsanlagen |
| WO1981003034A1 (en) * | 1980-04-25 | 1981-10-29 | Pacific Eng & Prod Co Nevada | Matched stage odor control system |
| US4310502A (en) * | 1980-05-29 | 1982-01-12 | Rockwell International Corporation | Singlet delta oxygen generator and process |
| US4996038A (en) * | 1983-07-05 | 1991-02-26 | Monsanto Company | Heat recovery from concentrated sulfuric acid |
| AT383049B (de) * | 1985-01-28 | 1987-05-11 | Elin Union Ag | Verfahren zur reduzierung der emissionswerte von industriellen abgasen und industrieller abluft |
| DE3507718A1 (de) * | 1985-03-05 | 1986-09-11 | Nukem Gmbh, 6450 Hanau | Verfahren zur reinigung von rauchgasen |
| US4668498A (en) * | 1985-09-27 | 1987-05-26 | Davis James A | Supersonic singlet delta oxygen aerosol generator |
| US4830718A (en) * | 1985-10-21 | 1989-05-16 | John Stauffer | Removal of sulfur dioxide (SO2) from waste gases and recovery as sulfuric acid |
| US4654205A (en) * | 1986-01-15 | 1987-03-31 | C-I-L Inc. | Sulphur trioxide absorption apparatus and process |
| DE3629766A1 (de) * | 1986-09-02 | 1988-03-17 | Bayer Ag | Verfahren zur reinigung und wiederaufheizung von abgasen |
| US5009869A (en) * | 1987-12-28 | 1991-04-23 | Electrocinerator Technologies, Inc. | Methods for purification of air |
| AU622372B2 (en) * | 1988-12-30 | 1992-04-02 | John E. Stauffer | Removal of sulfur dioxide from waste gases and recovery as sulfuric acid |
| US5505767A (en) * | 1994-06-08 | 1996-04-09 | Minor; Cheryl | System and process for collecting sulfuric acid fumes |
| US5593652A (en) * | 1995-06-28 | 1997-01-14 | Vulcan Materials Company | Method for increasing the production capacity of sulfuric acid plants and processes |
| US5683670A (en) * | 1995-06-28 | 1997-11-04 | Vulcan Materials Company | Method for increasing the production capacity of sulfuric acid plants and processes |
| AT402264B (de) | 1995-09-07 | 1997-03-25 | Austrian Energy & Environment | Verfahren und einrichtung zur nassen abscheidung saurer gase |
| US6019818A (en) * | 1996-09-27 | 2000-02-01 | G.F.K. Consulting, Ltd. | Combination quenching and scrubbing process and apparatus therefor |
| US6174510B1 (en) * | 1999-08-27 | 2001-01-16 | Marcos D. Riano | Multi-pass cocurrent flow sulfuric acid tower process |
| US6312503B1 (en) * | 1999-10-13 | 2001-11-06 | Arteva North America S.A.R.L. | System to quench gasses and remove condensables |
| TW527221B (en) * | 2000-08-21 | 2003-04-11 | Sumitomo Chemical Co | Method for removing sulfuric acid mist and apparatus for removing the same |
| KR20020080032A (ko) * | 2001-04-10 | 2002-10-23 | 송용철 | 탈취시스템 및 이를 이용한 탈취방법 |
| DE10118961B4 (de) * | 2001-04-10 | 2006-08-31 | Thermoselect Ag | Wäscher und Verfahren zum Reinigen von Gasen |
| US6726748B2 (en) * | 2002-07-16 | 2004-04-27 | The Babcock & Wilcox Company | Method of converting a downflow/upflow wet flue gas desulfurization (WFGD) system to an upflow single-loop WFGD system |
| US20040188356A1 (en) * | 2003-03-24 | 2004-09-30 | Haydock Intellectual Properties, L.L.C. | System for producing large particle precipitates |
| JP2007534601A (ja) * | 2004-04-27 | 2007-11-29 | アルベマール・コーポレーシヨン | 二酸化イオウの併流酸化法およびテトラブロモフタル酸無水物の製造におけるその使用 |
| EP1912723A4 (de) * | 2006-05-03 | 2011-08-03 | Snc Lavalin Europ N V Sa | Gasquench- und wäscherabzugssystem |
| JP4891705B2 (ja) * | 2006-08-28 | 2012-03-07 | ヤンマー株式会社 | コンバイン |
| WO2009023186A2 (en) * | 2007-08-10 | 2009-02-19 | Freije Treatment Systems, Inc. | Method and apparatus for treating a fluid |
| US20110192179A1 (en) * | 2010-02-05 | 2011-08-11 | Freije Iii William F | Evaporative heat transfer system and method |
| EP2578293A4 (de) * | 2010-05-31 | 2015-01-28 | Mitsubishi Heavy Ind Ltd | Abgasverarbeitungssystem und -verfahren |
| JPWO2011152548A1 (ja) | 2010-05-31 | 2013-08-01 | 三菱重工業株式会社 | 排ガス処理システム及び方法 |
| CA2800997C (en) | 2010-05-31 | 2015-12-22 | Mitsubishi Heavy Industries, Ltd. | Air pollution control system and method |
| CN102500126B (zh) * | 2011-12-11 | 2014-06-04 | 浙江大学 | 净化处理含持久性有机污染物高温烟气的方法及装置 |
| CN102657991B (zh) * | 2012-05-24 | 2014-04-16 | 深圳市泓耀环保有限公司 | 一体化文丘里空气洗涤装置 |
| TW201432204A (zh) * | 2013-02-08 | 2014-08-16 | Wholetech System Hitech Ltd | 燃燒式有害氣體處理裝置 |
| CN104353306B (zh) * | 2014-10-27 | 2016-05-04 | 瓮福(集团)有限责任公司 | 一种硫酸炉气净化工艺装置 |
| JP7085818B2 (ja) * | 2017-10-31 | 2022-06-17 | 三菱重工エンジニアリング株式会社 | ガス処理装置及びガス処理方法、co2回収装置及びco2回収方法 |
| EP4077212B1 (de) | 2019-12-19 | 2024-02-07 | Metso Metals Oy | Venturi-absorberrohr zum absorbieren von schwefeltrioxid in schwefelsäure |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE670966C (de) * | 1937-05-09 | 1939-01-28 | I G Farbenindustrie Akt Ges | Verfahren zur Gewinnung von Schwefelsaeure aus gasfoermigen Schwefelverbindungen niederer Oxydationsstufe |
| DE1234912B (de) * | 1961-12-02 | 1967-02-23 | Otto & Co Gmbh Dr C | Verfahren zur Entfernung der Schwefeloxyde aus Rauchgasen |
| US3523880A (en) * | 1967-12-27 | 1970-08-11 | Ionics | Electrolytic cell for removal and recovery of so2 from waste gases |
| US3524801A (en) * | 1968-02-09 | 1970-08-18 | Ionics | Process for producing sulfuric acid from so2 containing waste gas |
| CH547231A (de) * | 1970-10-15 | 1974-03-29 | Metallgesellschaft Ag | Zwischenabsorber fuer die absorption von so3 und verfahren zum betreiben des zwischenabsorbers. |
| DE2050580C3 (de) * | 1970-10-15 | 1979-09-06 | Metallgesellschaft Ag, 6000 Frankfurt | Vorrichtung zur Absorption von gasförmigen Bestandteilen |
| US3760061A (en) * | 1971-03-02 | 1973-09-18 | Du Pont | High-strength acid containing h2o2 to scrub so2 |
-
1973
- 1973-05-08 DE DE2322982A patent/DE2322982C3/de not_active Expired
-
1974
- 1974-03-14 NL NLAANVRAGE7403424,A patent/NL182213C/xx not_active IP Right Cessation
- 1974-03-27 ES ES424676A patent/ES424676A2/es not_active Expired
- 1974-03-29 AT AT264474A patent/AT333784B/de active
- 1974-04-05 ZA ZA00742211A patent/ZA742211B/xx unknown
- 1974-04-12 FR FR7413071A patent/FR2228528B2/fr not_active Expired
- 1974-05-02 JP JP49049639A patent/JPS5018384A/ja active Pending
- 1974-05-03 IT IT22250/74A patent/IT1046117B/it active
- 1974-05-03 CH CH605474A patent/CH576803A5/xx not_active IP Right Cessation
- 1974-05-06 FI FI1370/74A patent/FI56490C/fi active
- 1974-05-06 US US05/467,387 patent/US3944401A/en not_active Expired - Lifetime
- 1974-05-07 GB GB2017474A patent/GB1465371A/en not_active Expired
- 1974-05-07 BE BE6044569A patent/BE814693R/xx not_active IP Right Cessation
- 1974-05-08 CA CA199,328A patent/CA1019540A/en not_active Expired
- 1974-05-08 SE SE7406163A patent/SE412994B/xx not_active IP Right Cessation
-
1981
- 1981-11-18 JP JP56185141A patent/JPS57174124A/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57174124A (en) | 1982-10-26 |
| ZA742211B (en) | 1975-11-26 |
| FR2228528B2 (de) | 1977-01-07 |
| AT333784B (de) | 1976-12-10 |
| ATA264474A (de) | 1976-04-15 |
| GB1465371A (en) | 1977-02-23 |
| NL182213B (nl) | 1987-09-01 |
| FI56490B (fi) | 1979-10-31 |
| IT1046117B (it) | 1980-06-30 |
| DE2322982C3 (de) | 1979-09-13 |
| JPS5018384A (de) | 1975-02-26 |
| AU6830974A (en) | 1975-10-30 |
| US3944401A (en) | 1976-03-16 |
| SE412994B (sv) | 1980-03-31 |
| CA1019540A (en) | 1977-10-25 |
| DE2322982B2 (de) | 1979-01-18 |
| NL7403424A (de) | 1974-11-12 |
| BE814693R (fr) | 1974-11-07 |
| NL182213C (nl) | 1988-02-01 |
| CH576803A5 (de) | 1976-06-30 |
| FR2228528A2 (de) | 1974-12-06 |
| ES424676A2 (es) | 1976-01-16 |
| DE2322982A1 (de) | 1974-11-28 |
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