LV12413B - CHEMICALS FOR Separation of Sulfur Dioxide from Gaseous Flow with Simplified Gypsum Alfa-Half Hydrate - Google Patents
CHEMICALS FOR Separation of Sulfur Dioxide from Gaseous Flow with Simplified Gypsum Alfa-Half Hydrate Download PDFInfo
- Publication number
- LV12413B LV12413B LVP-99-115A LV990115A LV12413B LV 12413 B LV12413 B LV 12413B LV 990115 A LV990115 A LV 990115A LV 12413 B LV12413 B LV 12413B
- Authority
- LV
- Latvia
- Prior art keywords
- magnesium
- calcium
- sulphite
- aqueous medium
- aqueous solution
- Prior art date
Links
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 55
- 230000015572 biosynthetic process Effects 0.000 title description 3
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 title description 2
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 51
- 230000003647 oxidation Effects 0.000 claims abstract description 50
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims abstract description 45
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 claims abstract description 42
- 235000010261 calcium sulphite Nutrition 0.000 claims abstract description 42
- JESHZQPNPCJVNG-UHFFFAOYSA-L magnesium;sulfite Chemical compound [Mg+2].[O-]S([O-])=O JESHZQPNPCJVNG-UHFFFAOYSA-L 0.000 claims abstract description 36
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims abstract description 32
- 239000007789 gas Substances 0.000 claims abstract description 27
- 235000011132 calcium sulphate Nutrition 0.000 claims abstract description 21
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims abstract description 16
- 235000019341 magnesium sulphate Nutrition 0.000 claims abstract description 16
- 239000001175 calcium sulphate Substances 0.000 claims abstract description 15
- 239000004295 calcium sulphite Substances 0.000 claims abstract description 12
- 239000002244 precipitate Substances 0.000 claims abstract description 7
- 239000000047 product Substances 0.000 claims abstract description 7
- 239000006227 byproduct Substances 0.000 claims abstract description 5
- 239000011777 magnesium Substances 0.000 claims description 35
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 33
- 229910052749 magnesium Inorganic materials 0.000 claims description 33
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 23
- 239000011575 calcium Substances 0.000 claims description 23
- 229910052791 calcium Inorganic materials 0.000 claims description 23
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 239000007864 aqueous solution Substances 0.000 claims description 12
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 claims description 9
- 229910001425 magnesium ion Inorganic materials 0.000 claims description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 230000001590 oxidative effect Effects 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000010924 continuous production Methods 0.000 claims description 2
- 238000000746 purification Methods 0.000 claims 3
- 239000007900 aqueous suspension Substances 0.000 claims 2
- 239000000243 solution Substances 0.000 claims 2
- 238000007599 discharging Methods 0.000 claims 1
- 230000003993 interaction Effects 0.000 claims 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 claims 1
- 239000012736 aqueous medium Substances 0.000 abstract description 65
- 238000005201 scrubbing Methods 0.000 abstract description 59
- 239000002002 slurry Substances 0.000 abstract description 16
- 239000003546 flue gas Substances 0.000 abstract description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 4
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical class OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 abstract description 4
- 239000003245 coal Substances 0.000 abstract description 3
- 238000004140 cleaning Methods 0.000 abstract description 2
- 239000002609 medium Substances 0.000 description 24
- 235000010269 sulphur dioxide Nutrition 0.000 description 23
- 229940044609 sulfur dioxide Drugs 0.000 description 21
- 239000002562 thickening agent Substances 0.000 description 19
- 229910052602 gypsum Inorganic materials 0.000 description 17
- 239000010440 gypsum Substances 0.000 description 17
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 11
- 239000011593 sulfur Substances 0.000 description 11
- 229910052717 sulfur Inorganic materials 0.000 description 11
- 238000005200 wet scrubbing Methods 0.000 description 9
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 7
- 235000011941 Tilia x europaea Nutrition 0.000 description 7
- 239000004571 lime Substances 0.000 description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- LPHFLPKXBKBHRW-UHFFFAOYSA-L magnesium;hydrogen sulfite Chemical compound [Mg+2].OS([O-])=O.OS([O-])=O LPHFLPKXBKBHRW-UHFFFAOYSA-L 0.000 description 5
- 239000010802 sludge Substances 0.000 description 5
- 229940095672 calcium sulfate Drugs 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 3
- 239000000347 magnesium hydroxide Substances 0.000 description 3
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 238000013019 agitation Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000003607 modifier Substances 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- KDYFGRWQOYBRFD-UHFFFAOYSA-N succinic acid Chemical compound OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 description 2
- 239000004291 sulphur dioxide Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 208000036366 Sensation of pressure Diseases 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- SGPGESCZOCHFCL-UHFFFAOYSA-N Tilisolol hydrochloride Chemical compound [Cl-].C1=CC=C2C(=O)N(C)C=C(OCC(O)C[NH2+]C(C)(C)C)C2=C1 SGPGESCZOCHFCL-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052925 anhydrite Inorganic materials 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229940043430 calcium compound Drugs 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 150000003841 chloride salts Chemical class 0.000 description 1
- 238000010960 commercial process Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229940057306 hemihydrate calcium sulfate Drugs 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 150000002681 magnesium compounds Chemical class 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000001384 succinic acid Substances 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 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
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
- C01F11/464—Sulfates of Ca from gases containing sulfur oxides
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Geology (AREA)
- Biomedical Technology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/999,621 US5312609A (en) | 1992-12-31 | 1992-12-31 | Method of sulfur dioxide removal from gaseous streams with α-hemihydrate gypsum product formation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| LV12413A LV12413A (lv) | 2000-01-20 |
| LV12413B true LV12413B (en) | 2000-06-20 |
Family
ID=25546539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| LVP-99-115A LV12413B (en) | 1992-12-31 | 1999-08-04 | CHEMICALS FOR Separation of Sulfur Dioxide from Gaseous Flow with Simplified Gypsum Alfa-Half Hydrate |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US5312609A (da) |
| EP (1) | EP0604701B1 (da) |
| JP (1) | JPH06226042A (da) |
| AT (1) | ATE180181T1 (da) |
| CA (1) | CA2097996C (da) |
| DE (1) | DE69325008T2 (da) |
| DK (1) | DK0604701T3 (da) |
| ES (1) | ES2131541T3 (da) |
| LV (1) | LV12413B (da) |
| PL (1) | PL175063B1 (da) |
| TR (1) | TR27345A (da) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2147059C (en) * | 1994-04-28 | 1999-08-10 | John W. College | Magnesium-enhanced sulfur dioxide scrubbing with gypsum formation |
| US5824273A (en) * | 1995-06-23 | 1998-10-20 | Mitsubishi Jukogyo Kabushiki Kaisha | Gas refining system |
| US5614158A (en) * | 1995-10-20 | 1997-03-25 | Dravo Lime Company | Process for removing sulfur dioxide from gases and producing gypsum and purified magnesium hydroxide |
| FI102959B (fi) * | 1996-09-23 | 1999-03-31 | Kemira Agro Oy | Menetelmä magnesiumsulfiitin tai magnesiumvetysulfiitin hapettamiseksi |
| US6068822A (en) * | 1997-03-24 | 2000-05-30 | Mitsubishi Heavy Industries, Ltd. | Desulforization method and desulfurization apparatus in geothermal power plant |
| US6197200B1 (en) | 1999-05-11 | 2001-03-06 | Eastroc Llc | Method of purifying flue gas waste slurries for use in gypsum production |
| US6572832B2 (en) * | 2001-03-27 | 2003-06-03 | Carmeuse North America Services, Inc. | Method of removing sulfur dioxide from a gaseous stream in a wet scrubbing unit |
| US6695018B2 (en) * | 2002-06-10 | 2004-02-24 | The Babcock & Wilcox Company | Collection scoop for flue gas desulfurization systems with bleed streams or ex situ forced oxidation |
| CN100382873C (zh) * | 2003-06-06 | 2008-04-23 | 浙江大学 | 常压盐溶液法制取α-半水脱硫石膏工艺 |
| US7273579B2 (en) * | 2004-01-28 | 2007-09-25 | United States Gypsum Company | Process for production of gypsum/fiber board |
| US20070088112A1 (en) * | 2005-10-05 | 2007-04-19 | Hooks Henry E | Fire retardant compositions |
| US8173090B2 (en) | 2010-07-08 | 2012-05-08 | Air Products And Chemicals, Inc. | Sorbent use with oxyfuel sour compression |
| JP6519610B2 (ja) * | 2017-06-30 | 2019-05-29 | 宇部興産株式会社 | 石膏及びその製造方法、セメント組成物及びその製造方法、ならびに地盤改良材 |
| JP6763419B2 (ja) * | 2018-08-08 | 2020-09-30 | 宇部興産株式会社 | セメント組成物の製造方法、及びセメント組成物の製造システム |
| JP6958682B2 (ja) * | 2018-08-08 | 2021-11-02 | 宇部興産株式会社 | セメント組成物の製造方法、及びセメント組成物の製造システム |
| CN110090540B (zh) * | 2019-04-19 | 2021-05-14 | 华南理工大学 | 一种硅酸钙板生产过程中的废气净化除臭工艺及装置 |
Family Cites Families (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3637347A (en) * | 1969-07-31 | 1972-01-25 | Combustion Eng | Air pollution control system with chemical recovery |
| US3919393A (en) * | 1973-03-08 | 1975-11-11 | Dravo Corp | Process for sulfur dioxide removal from combustion gases |
| US3919394A (en) * | 1973-05-14 | 1975-11-11 | Dravo Corp | Process for the removal of oxides of sulfur from a gaseous stream |
| US4046856A (en) * | 1974-03-15 | 1977-09-06 | Kawasaki Jukogyo Kabushiki Kaisha | Method for removing sulfur oxide from stack gas |
| JPS5140399A (en) * | 1974-10-03 | 1976-04-05 | Taki Chemical | Aryusankarushiumuno shorihoho |
| GB1547422A (en) * | 1975-03-31 | 1979-06-20 | Japan Government | Manufacture of gypsum |
| DE3331838A1 (de) * | 1983-09-03 | 1985-03-21 | Gottfried Bischoff Bau kompl. Gasreinigungs- und Wasserrückkühlanlagen GmbH & Co KG, 4300 Essen | Verfahren zur umsetzung des rueckstandes aus rauchgas-entschwefelungsanlagen zu alphahalbhydrat-gipskristallen |
| JPS6090027A (ja) * | 1983-10-25 | 1985-05-21 | Kureha Chem Ind Co Ltd | 排煙脱硫方法 |
| DK189784D0 (da) * | 1984-04-12 | 1984-04-12 | Niro Atomizer As | Fremgangsmaade og apparat til behandling af biprodukter fra roeggasafsvovlning |
| CA1258961A (en) * | 1984-09-17 | 1989-09-05 | Yoshihiko Kudo | PROCESS FOR PRODUCING .alpha.-FORM GYPSUM HEMIHYDRATE |
| JPS61207620A (ja) * | 1985-03-13 | 1986-09-16 | Toray Ind Inc | ポリエステル繊維 |
| DE3522495A1 (de) * | 1985-06-24 | 1987-01-02 | Heinrich Quante | Verfahren zur drucklosen herstellung von alphagips-halbhydrat und vorrichtung zur durchfuehrung des verfahrens |
| EP0294415B1 (de) * | 1986-12-18 | 1990-10-03 | GEBHARD, Georg, Dr. | Verfahren zur in-situ-gewinnung von calciumsulfathalbhydrat und/oder calciumsulfat (anhydrit) aus dem wäscher einer nassen rauchgasentschwefelungsanlage |
| DE3844938C2 (de) * | 1987-05-22 | 1996-09-19 | Pro Mineral Ges | Verfahren zur Erzeugung von Calciumsulfat-Alphahalbhydrat aus feinteiligem Calciumsulfat und dessen Verwendung |
| GB2205089B (en) * | 1987-05-22 | 1991-03-13 | Rhein Westfael Elect Werk Ag | Process for production of calcium sulphate alpha-hemihydrate |
| KR970005867B1 (ko) * | 1988-11-18 | 1997-04-21 | 유나이티드 스테이트 집섬 캄파니 | 석고 합성물 및 그 제조방법 |
| US4976936A (en) * | 1989-08-18 | 1990-12-11 | Dravo Lime Company | Flue gas desulfurization with oxidation of calcium sulfite in FGD discharges |
| US5084255A (en) * | 1991-03-26 | 1992-01-28 | Dravco Lime Company | Sulfur dioxide removal process with gypsum and magnesium hydroxide production |
-
1992
- 1992-12-31 US US07/999,621 patent/US5312609A/en not_active Expired - Lifetime
-
1993
- 1993-06-04 EP EP93109063A patent/EP0604701B1/en not_active Expired - Lifetime
- 1993-06-04 ES ES93109063T patent/ES2131541T3/es not_active Expired - Lifetime
- 1993-06-04 DK DK93109063T patent/DK0604701T3/da active
- 1993-06-04 AT AT93109063T patent/ATE180181T1/de not_active IP Right Cessation
- 1993-06-04 DE DE69325008T patent/DE69325008T2/de not_active Expired - Lifetime
- 1993-06-08 CA CA002097996A patent/CA2097996C/en not_active Expired - Lifetime
- 1993-07-27 TR TR00645/93A patent/TR27345A/xx unknown
- 1993-10-19 PL PL93300755A patent/PL175063B1/pl unknown
- 1993-11-19 JP JP5291016A patent/JPH06226042A/ja active Pending
-
1999
- 1999-08-04 LV LVP-99-115A patent/LV12413B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06226042A (ja) | 1994-08-16 |
| DE69325008T2 (de) | 1999-09-16 |
| CA2097996C (en) | 1998-11-10 |
| PL175063B1 (pl) | 1998-10-30 |
| DK0604701T3 (da) | 1999-06-23 |
| US5312609A (en) | 1994-05-17 |
| ATE180181T1 (de) | 1999-06-15 |
| LV12413A (lv) | 2000-01-20 |
| TR27345A (tr) | 1995-01-13 |
| EP0604701B1 (en) | 1999-05-19 |
| PL300755A1 (en) | 1994-07-11 |
| DE69325008D1 (de) | 1999-06-24 |
| CA2097996A1 (en) | 1994-07-01 |
| EP0604701A1 (en) | 1994-07-06 |
| ES2131541T3 (es) | 1999-08-01 |
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