SE7901499L - Sett att behandla sura petroleumdestillat - Google Patents
Sett att behandla sura petroleumdestillatInfo
- Publication number
- SE7901499L SE7901499L SE7901499A SE7901499A SE7901499L SE 7901499 L SE7901499 L SE 7901499L SE 7901499 A SE7901499 A SE 7901499A SE 7901499 A SE7901499 A SE 7901499A SE 7901499 L SE7901499 L SE 7901499L
- Authority
- SE
- Sweden
- Prior art keywords
- way
- petroleum distillate
- sour petroleum
- treat sour
- distillate
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
- B01J31/1616—Coordination complexes, e.g. organometallic complexes, immobilised on an inorganic support, e.g. ship-in-a-bottle type catalysts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
- B01J31/0234—Nitrogen-, phosphorus-, arsenic- or antimony-containing compounds
- B01J31/0235—Nitrogen containing compounds
- B01J31/0239—Quaternary ammonium compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
- B01J31/0234—Nitrogen-, phosphorus-, arsenic- or antimony-containing compounds
- B01J31/0235—Nitrogen containing compounds
- B01J31/0254—Nitrogen containing compounds on mineral substrates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
- B01J31/18—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes containing nitrogen, phosphorus, arsenic or antimony as complexing atoms, e.g. in pyridine ligands, or in resonance therewith, e.g. in isocyanide ligands C=N-R or as complexed central atoms
- B01J31/1805—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes containing nitrogen, phosphorus, arsenic or antimony as complexing atoms, e.g. in pyridine ligands, or in resonance therewith, e.g. in isocyanide ligands C=N-R or as complexed central atoms the ligands containing nitrogen
- B01J31/181—Cyclic ligands, including e.g. non-condensed polycyclic ligands, comprising at least one complexing nitrogen atom as ring member, e.g. pyridine
- B01J31/1825—Ligands comprising condensed ring systems, e.g. acridine, carbazole
- B01J31/183—Ligands comprising condensed ring systems, e.g. acridine, carbazole with more than one complexing nitrogen atom, e.g. phenanthroline
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G27/00—Refining of hydrocarbon oils in the absence of hydrogen, by oxidation
- C10G27/04—Refining of hydrocarbon oils in the absence of hydrogen, by oxidation with oxygen or compounds generating oxygen
- C10G27/06—Refining of hydrocarbon oils in the absence of hydrogen, by oxidation with oxygen or compounds generating oxygen in the presence of alkaline solutions
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G27/00—Refining of hydrocarbon oils in the absence of hydrogen, by oxidation
- C10G27/04—Refining of hydrocarbon oils in the absence of hydrogen, by oxidation with oxygen or compounds generating oxygen
- C10G27/10—Refining of hydrocarbon oils in the absence of hydrogen, by oxidation with oxygen or compounds generating oxygen in the presence of metal-containing organic complexes, e.g. chelates, or cationic ion-exchange resins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/18—Carbon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2231/00—Catalytic reactions performed with catalysts classified in B01J31/00
- B01J2231/70—Oxidation reactions, e.g. epoxidation, (di)hydroxylation, dehydrogenation and analogues
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
- B01J2531/02—Compositional aspects of complexes used, e.g. polynuclearity
- B01J2531/0238—Complexes comprising multidentate ligands, i.e. more than 2 ionic or coordinative bonds from the central metal to the ligand, the latter having at least two donor atoms, e.g. N, O, S, P
- B01J2531/0241—Rigid ligands, e.g. extended sp2-carbon frameworks or geminal di- or trisubstitution
- B01J2531/025—Ligands with a porphyrin ring system or analogues thereof, e.g. phthalocyanines, corroles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
- B01J2531/80—Complexes comprising metals of Group VIII as the central metal
- B01J2531/84—Metals of the iron group
- B01J2531/845—Cobalt
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2540/00—Compositional aspects of coordination complexes or ligands in catalyst systems
- B01J2540/30—Non-coordinating groups comprising sulfur
- B01J2540/34—Sulfonyl groups
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Inorganic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
- Catalysts (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/880,723 US4124493A (en) | 1978-02-24 | 1978-02-24 | Catalytic oxidation of mercaptan in petroleum distillate including alkaline reagent and substituted ammonium halide |
Publications (2)
Publication Number | Publication Date |
---|---|
SE7901499L true SE7901499L (sv) | 1979-08-25 |
SE431344B SE431344B (sv) | 1984-01-30 |
Family
ID=25376937
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE7901499A SE431344B (sv) | 1978-02-24 | 1979-02-20 | Sett att behandla ett merkaptanhaltigt surt petroleumdestillat |
Country Status (33)
Country | Link |
---|---|
US (3) | US4124493A (sv) |
JP (1) | JPS54126204A (sv) |
AR (1) | AR228127A1 (sv) |
AT (1) | AT368543B (sv) |
AU (1) | AU518753B2 (sv) |
BE (1) | BE874264A (sv) |
BG (1) | BG48340A3 (sv) |
BR (1) | BR7901145A (sv) |
CA (1) | CA1124197A (sv) |
DE (1) | DE2905581C2 (sv) |
DK (1) | DK151972C (sv) |
EG (1) | EG14010A (sv) |
ES (1) | ES477956A1 (sv) |
FI (1) | FI64390C (sv) |
FR (1) | FR2418270A1 (sv) |
GB (1) | GB2017141B (sv) |
GR (1) | GR67627B (sv) |
HU (1) | HU181983B (sv) |
IE (1) | IE47834B1 (sv) |
IS (1) | IS1085B6 (sv) |
IT (1) | IT1112028B (sv) |
MX (1) | MX150357A (sv) |
MY (1) | MY8500334A (sv) |
NL (1) | NL7901397A (sv) |
NO (1) | NO157588C (sv) |
PT (1) | PT69216B (sv) |
RO (1) | RO78591A (sv) |
SE (1) | SE431344B (sv) |
SG (1) | SG32385G (sv) |
SU (1) | SU878199A3 (sv) |
TR (1) | TR20424A (sv) |
YU (1) | YU40740B (sv) |
ZA (1) | ZA79783B (sv) |
Families Citing this family (47)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4124493A (en) * | 1978-02-24 | 1978-11-07 | Uop Inc. | Catalytic oxidation of mercaptan in petroleum distillate including alkaline reagent and substituted ammonium halide |
AU530970B2 (en) * | 1978-07-24 | 1983-08-04 | Uop Inc. | Catalytic composite |
WO1980000313A1 (en) * | 1978-07-26 | 1980-03-06 | Nat Res Dev | Improvements in the stabilisation of hygroscopic salts |
US4293442A (en) * | 1979-08-10 | 1981-10-06 | Uop Inc. | Catalytic composite, method of manufacture, and process for use |
US4250022A (en) * | 1979-08-15 | 1981-02-10 | Uop Inc. | Catalytic oxidation of mercaptan in petroleum distillate |
US4318825A (en) * | 1979-08-15 | 1982-03-09 | Frame Robert R | Catalytic composite, and method of manufacture |
US4260479A (en) * | 1979-09-27 | 1981-04-07 | Uop Inc. | Catalytic oxidation of mercaptan in sour petroleum distillate |
US4290916A (en) * | 1979-10-01 | 1981-09-22 | Uop Inc. | Catalytic composite, method of manufacture, and process for use |
US4324650A (en) * | 1979-10-01 | 1982-04-13 | Uop Inc. | Catalytic composite and process for use |
US4290917A (en) * | 1979-10-01 | 1981-09-22 | Uop Inc. | Method of manufacturing a catalytic composite |
US4276194A (en) * | 1979-10-01 | 1981-06-30 | Uop Inc. | Catalytic composite, method of manufacture, and process for use |
US4337147A (en) * | 1979-11-07 | 1982-06-29 | Uop Inc. | Catalytic composite and process for use |
US4354926A (en) * | 1980-01-04 | 1982-10-19 | Uop Inc. | Catalytic composite and process for use |
US4295993A (en) * | 1980-01-04 | 1981-10-20 | Uop Inc. | Catalytic composite, method of manufacture and process for use |
US4298463A (en) * | 1980-07-11 | 1981-11-03 | Uop Inc. | Method of treating a sour petroleum distillate |
US4320029A (en) * | 1980-07-17 | 1982-03-16 | Uop Inc. | Catalytic composite, method of manufacture, and process for use |
US4360421A (en) * | 1980-07-17 | 1982-11-23 | Uop Inc. | Method for treating mercaptans contained in a sour petroleum distillate |
US4746494A (en) * | 1985-05-30 | 1988-05-24 | Merichem Company | Treatment of sour hydrocarbon distillate |
US4675100A (en) * | 1985-05-30 | 1987-06-23 | Merichem Company | Treatment of sour hydrocarbon distillate |
US4725420A (en) * | 1985-09-25 | 1988-02-16 | Toa Nenryo Kogyo Kabushiki Kaisha | Process for the production of silanes |
US4753722A (en) * | 1986-06-17 | 1988-06-28 | Merichem Company | Treatment of mercaptan-containing streams utilizing nitrogen based promoters |
US4775462A (en) * | 1987-06-22 | 1988-10-04 | Uop Inc. | Non-oxidative method of sweetening a sour hydrocarbon fraction |
US4897180A (en) * | 1988-02-05 | 1990-01-30 | Uop | Catalytic composite and process for mercaptan sweetening |
US4824818A (en) * | 1988-02-05 | 1989-04-25 | Uop Inc. | Catalytic composite and process for mercaptan sweetening |
DE3814167A1 (de) * | 1988-04-27 | 1989-11-09 | Bayer Ag | Verfahren zur herstellung von isocyanuratgruppen aufweisenden polyisocyanaten und ihre verwendung |
US4913802A (en) * | 1989-05-08 | 1990-04-03 | Uop | Process for sweetening a sour hydrocarbon fraction |
US4908122A (en) * | 1989-05-08 | 1990-03-13 | Uop | Process for sweetening a sour hydrocarbon fraction |
AU618886B2 (en) * | 1989-05-08 | 1992-01-09 | Uop | Caustic-free sweetening of sour hydrocarbon streams |
US4923596A (en) * | 1989-05-22 | 1990-05-08 | Uop | Use of quaternary ammonium compounds in a liquid/liquid process for sweetening a sour hydrocarbon fraction |
US4929340A (en) * | 1989-07-31 | 1990-05-29 | Uop | Catalyst and process for sweetening a sour hydrocarbon fraction using dipolar compounds |
US5039398A (en) * | 1990-03-19 | 1991-08-13 | Uop | Elimination of caustic prewash in the fixed bed sweetening of high naphthenic acids hydrocarbons |
US5093296A (en) * | 1990-08-27 | 1992-03-03 | Uop | Caustic free liquid/liquid process for sweetening a sour hydrocarbon fraction |
US5273646A (en) * | 1990-08-27 | 1993-12-28 | Uop | Process for improving the activity of a mercaptan oxidation catalyst |
US5180484A (en) * | 1990-08-27 | 1993-01-19 | Uop | Caustic free liquid/liquid process for sweeting a sour hydrocarbon fraction |
US5204306A (en) * | 1990-08-27 | 1993-04-20 | Uop | Caustic free catalyst for use in a liquid/liquid process for sweetening a sour hydrocarbon fraction |
GB9023257D0 (en) * | 1990-10-25 | 1990-12-05 | British Petroleum Co Plc | Desulphurisation of oil |
US5200062A (en) * | 1991-06-17 | 1993-04-06 | Exxon Research And Engineering Company | Process for removing elemental sulfur from fluids |
US5218147A (en) * | 1992-02-10 | 1993-06-08 | Phillips Petroleum Company | Stable polysulfides and process therefor |
US5232887A (en) * | 1992-04-02 | 1993-08-03 | Uop | Catalyst for sweetening a sour hydrocarbon fraction |
US5318936A (en) * | 1992-09-23 | 1994-06-07 | Uop | Catalyst for sweetening a sour hydrocarbon fraction containing metal oxide solid solution and magnesium oxide |
US5413704A (en) * | 1993-11-15 | 1995-05-09 | Uop | Process for sweetening a sour hydrocarbon fraction using a mixture of a supported metal chelate and a solid base |
US5413701A (en) * | 1993-11-15 | 1995-05-09 | Uop | Process for sweetening a sour hydrocarbon fraction using a supported metal chelate and a solid base |
US6306288B1 (en) | 1998-04-17 | 2001-10-23 | Uop Llc | Process for removing sulfur compounds from hydrocarbon streams |
CA2407066A1 (en) * | 2000-04-18 | 2001-10-25 | Exxonmobil Research And Engineering Company | Selective hydroprocessing and mercaptan removal |
US6488840B1 (en) * | 2000-04-18 | 2002-12-03 | Exxonmobil Research And Engineering Company | Mercaptan removal from petroleum streams (Law950) |
US6352640B1 (en) | 2000-04-18 | 2002-03-05 | Exxonmobil Research And Engineering Company | Caustic extraction of mercaptans (LAW966) |
US7223332B1 (en) | 2003-10-21 | 2007-05-29 | Uop Llc | Reactor and process for mercaptan oxidation and separation in the same vessel |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2560374A (en) * | 1949-02-19 | 1951-07-10 | Standard Oil Dev Co | Treatment of sour petroleum distillates |
US2671048A (en) * | 1951-03-01 | 1954-03-02 | Universal Oil Prod Co | Treatment of hydrocarbon distillates |
US2744854A (en) * | 1952-06-30 | 1956-05-08 | Universal Oil Prod Co | Oxidation of mercaptans |
US3164544A (en) * | 1963-02-26 | 1965-01-05 | Sun Oil Co | Oxidative sweetening with base and quaternary ammonium compound |
US3978137A (en) * | 1975-03-14 | 1976-08-31 | Universal Oil Products Company | Oxidation of sulfur-containing compounds |
US4003827A (en) * | 1975-06-12 | 1977-01-18 | Universal Oil Products Company | Mercaptan conversion process for a petroleum distillate charge stock |
US4028269A (en) * | 1975-08-21 | 1977-06-07 | Uop Inc. | Process for the preparation of a solid bed catalyst system |
US4033860A (en) * | 1975-09-10 | 1977-07-05 | Uop Inc. | Mercaptan conversion process |
US4070271A (en) * | 1975-09-22 | 1978-01-24 | Uop Inc. | Catalytic oxidation of mercaptans and removal of naphthenic acids, catalyst toxins, and toxin precursors from petroleum distillates |
ZA7740B (en) * | 1976-01-14 | 1977-11-30 | Uop Inc | Improved process for sweetening sour hydrocarbon distillates |
US4124531A (en) * | 1977-01-03 | 1978-11-07 | Uop Inc. | Catalytic composite for the treatment of sour petroleum distillates |
US4124494A (en) * | 1978-01-11 | 1978-11-07 | Uop Inc. | Treating a petroleum distillate with a supported metal phthalocyanine and an alkanolamine hydroxide |
US4121997A (en) * | 1978-01-11 | 1978-10-24 | Uop Inc. | Treating a petroleum distillate with a supported metal phthalocyanine and an alkaline reagent containing alkanolamine halide |
US4124493A (en) * | 1978-02-24 | 1978-11-07 | Uop Inc. | Catalytic oxidation of mercaptan in petroleum distillate including alkaline reagent and substituted ammonium halide |
-
1978
- 1978-02-24 US US05/880,723 patent/US4124493A/en not_active Expired - Lifetime
- 1978-07-24 US US05/927,317 patent/US4157312A/en not_active Expired - Lifetime
- 1978-07-28 US US05/929,054 patent/US4156641A/en not_active Expired - Lifetime
-
1979
- 1979-02-09 FR FR7903339A patent/FR2418270A1/fr active Granted
- 1979-02-12 IE IE264/79A patent/IE47834B1/en unknown
- 1979-02-13 GR GR58346A patent/GR67627B/el unknown
- 1979-02-13 PT PT6921679A patent/PT69216B/pt unknown
- 1979-02-14 DE DE2905581A patent/DE2905581C2/de not_active Expired
- 1979-02-14 AU AU44230/79A patent/AU518753B2/en not_active Ceased
- 1979-02-14 IS IS2479A patent/IS1085B6/is unknown
- 1979-02-19 CA CA321,749A patent/CA1124197A/en not_active Expired
- 1979-02-19 BE BE193539A patent/BE874264A/xx not_active IP Right Cessation
- 1979-02-20 SE SE7901499A patent/SE431344B/sv unknown
- 1979-02-20 ZA ZA79783A patent/ZA79783B/xx unknown
- 1979-02-21 EG EG115/79A patent/EG14010A/xx active
- 1979-02-21 MX MX176673A patent/MX150357A/es unknown
- 1979-02-21 YU YU421/79A patent/YU40740B/xx unknown
- 1979-02-21 BR BR7901145A patent/BR7901145A/pt unknown
- 1979-02-22 ES ES477956A patent/ES477956A1/es not_active Expired
- 1979-02-22 NL NL7901397A patent/NL7901397A/xx not_active Application Discontinuation
- 1979-02-22 AR AR275589A patent/AR228127A1/es active
- 1979-02-22 HU HU79UO155A patent/HU181983B/hu not_active IP Right Cessation
- 1979-02-23 SU SU792737952A patent/SU878199A3/ru active
- 1979-02-23 IT IT20508/79A patent/IT1112028B/it active
- 1979-02-23 NO NO790618A patent/NO157588C/no unknown
- 1979-02-23 AT AT0142779A patent/AT368543B/de not_active IP Right Cessation
- 1979-02-23 BG BG042641A patent/BG48340A3/xx unknown
- 1979-02-23 FI FI790618A patent/FI64390C/fi not_active IP Right Cessation
- 1979-02-23 JP JP1985279A patent/JPS54126204A/ja active Granted
- 1979-02-23 TR TR20424A patent/TR20424A/xx unknown
- 1979-02-23 DK DK079379A patent/DK151972C/da not_active IP Right Cessation
- 1979-02-23 GB GB7906586A patent/GB2017141B/en not_active Expired
- 1979-02-24 RO RO7996721A patent/RO78591A/ro unknown
-
1985
- 1985-04-30 SG SG32385A patent/SG32385G/en unknown
- 1985-12-30 MY MY334/85A patent/MY8500334A/xx unknown
Also Published As
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Legal Events
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