ZA92396B - Fluorination catalyst and process - Google Patents
Fluorination catalyst and processInfo
- Publication number
- ZA92396B ZA92396B ZA92396A ZA92396A ZA92396B ZA 92396 B ZA92396 B ZA 92396B ZA 92396 A ZA92396 A ZA 92396A ZA 92396 A ZA92396 A ZA 92396A ZA 92396 B ZA92396 B ZA 92396B
- Authority
- ZA
- South Africa
- Prior art keywords
- zinc
- catalyst
- chromium
- activity
- fluorination catalyst
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C19/00—Acyclic saturated compounds containing halogen atoms
- C07C19/08—Acyclic saturated compounds containing halogen atoms containing fluorine
-
- 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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/24—Chromium, molybdenum or tungsten
- B01J23/26—Chromium
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C17/00—Preparation of halogenated hydrocarbons
- C07C17/093—Preparation of halogenated hydrocarbons by replacement by halogens
- C07C17/10—Preparation of halogenated hydrocarbons by replacement by halogens of hydrogen atoms
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C17/00—Preparation of halogenated hydrocarbons
- C07C17/093—Preparation of halogenated hydrocarbons by replacement by halogens
- C07C17/20—Preparation of halogenated hydrocarbons by replacement by halogens of halogen atoms by other halogen atoms
- C07C17/202—Preparation of halogenated hydrocarbons by replacement by halogens of halogen atoms by other halogen atoms two or more compounds being involved in the reaction
- C07C17/206—Preparation of halogenated hydrocarbons by replacement by halogens of halogen atoms by other halogen atoms two or more compounds being involved in the reaction the other compound being HX
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C17/00—Preparation of halogenated hydrocarbons
- C07C17/093—Preparation of halogenated hydrocarbons by replacement by halogens
- C07C17/20—Preparation of halogenated hydrocarbons by replacement by halogens of halogen atoms by other halogen atoms
- C07C17/21—Preparation of halogenated hydrocarbons by replacement by halogens of halogen atoms by other halogen atoms with simultaneous increase of the number of halogen atoms
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
- Catalysts (AREA)
- Glass Compositions (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB919104775A GB9104775D0 (en) | 1991-03-07 | 1991-03-07 | Fluorination catalyst and process |
Publications (1)
Publication Number | Publication Date |
---|---|
ZA92396B true ZA92396B (en) | 1992-11-25 |
Family
ID=10691125
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ZA92396A ZA92396B (en) | 1991-03-07 | 1992-01-20 | Fluorination catalyst and process |
Country Status (25)
Country | Link |
---|---|
US (3) | US5281568A (no) |
EP (3) | EP1350564A1 (no) |
JP (1) | JPH05220400A (no) |
KR (1) | KR100217353B1 (no) |
CN (2) | CN1064628A (no) |
AT (2) | ATE313377T1 (no) |
AU (1) | AU658161B2 (no) |
CA (1) | CA2059983C (no) |
CS (1) | CS17192A3 (no) |
DE (2) | DE69233583T2 (no) |
DK (1) | DK0502605T3 (no) |
ES (2) | ES2255705T3 (no) |
FI (1) | FI920273A (no) |
GB (2) | GB9104775D0 (no) |
GR (1) | GR3020970T3 (no) |
HU (1) | HUT63825A (no) |
IE (1) | IE75727B1 (no) |
IN (1) | IN185352B (no) |
MY (1) | MY108102A (no) |
NO (1) | NO920299L (no) |
PL (1) | PL293283A1 (no) |
RU (1) | RU2032464C1 (no) |
SG (1) | SG50565A1 (no) |
YU (1) | YU13292A (no) |
ZA (1) | ZA92396B (no) |
Families Citing this family (73)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5185482A (en) * | 1989-02-03 | 1993-02-09 | E. I. Du Pont De Nemours And Company | Manufacture of 1,1,1,2-tetrafluoroethane |
IT1230779B (it) * | 1989-07-12 | 1991-10-29 | Ausimont Srl | Procedimento per preparare 1,1,1,2 tetrafluoroetano. |
GB9104775D0 (en) * | 1991-03-07 | 1991-04-17 | Ici Plc | Fluorination catalyst and process |
US6300531B1 (en) * | 1991-05-24 | 2001-10-09 | Daikin Industries, Ltd. | Fluorination catalyst and process for fluorinating halogenated hydrocarbon |
GB9219720D0 (en) * | 1992-09-17 | 1992-10-28 | Ici Plc | Catalyst production |
GB9404703D0 (en) * | 1993-03-24 | 1994-04-27 | Ici Plc | Production of difluoromethane |
EP0629440B1 (en) * | 1993-06-18 | 1998-01-14 | Showa Denko Kabushiki Kaisha | Fluorination catalyst and fluorination process |
DE69415748T2 (de) * | 1993-09-07 | 1999-08-19 | Showa Denko K.K. | Auf Chrom basierter Fluorierungskatalysator, Verfahren zur Herstellung dieses Katalysators und Fluorierungsverfahren mittels dieses Katalysators |
KR960010775B1 (ko) * | 1993-12-01 | 1996-08-08 | 한국과학기술연구원 | 염화수소의 산화에 의한 염소제조용 염화세륨-삼산화이크롬 촉매 및 이의 제조방법 |
KR960016683B1 (en) * | 1993-12-09 | 1996-12-20 | Korea Inst Sci & Tech | Method of producing fluorization catalyst for preparing 1,1,1,2-tetrafluoroethane |
GB9406813D0 (en) * | 1994-04-06 | 1994-05-25 | Ici Plc | Production of pentafluoroethane |
US5494877A (en) * | 1994-06-20 | 1996-02-27 | Showa Denko K. K. | Chromium-based fluorination catalyst containing gallium and production method thereof |
GB9417116D0 (en) * | 1994-08-24 | 1994-10-12 | Ici Plc | Process for the manufacture of pentafluoroethane |
JP3558385B2 (ja) * | 1994-10-13 | 2004-08-25 | 昭和電工株式会社 | クロム系フッ素化触媒、及びフッ素化方法 |
KR0125143B1 (ko) * | 1994-12-02 | 1997-11-27 | 김은영 | 1,1,1-트리플루오로-2,2-디클로로에탄의 불소화 촉매 및 그것의 제조방법 |
JP3853397B2 (ja) * | 1995-05-11 | 2006-12-06 | イネオス フラウアー ホールデイングス リミテッド | ペンタフルオロエタンの製造方法及びペンタフルオロエタンに転化するのに適当な組成物 |
US5654494A (en) * | 1995-08-18 | 1997-08-05 | Alliedsignal Inc. | Process for the manufacture of 1,1,1,2-tetrafluoroethane |
KR0152580B1 (ko) * | 1995-08-23 | 1998-10-15 | 김은영 | 1,1,1,2-테트라플루오로에탄, 펜타플루오로에탄 및 1,1,1-트리플루오로에탄의 병산 방법 |
FR2740994B1 (fr) | 1995-11-10 | 1997-12-05 | Atochem Elf Sa | Catalyseurs massiques a base d'oxyde de chrome, leur procede de preparation et leur application a la fluoration d'hydrocarbures halogenes |
US5864859A (en) * | 1996-02-20 | 1999-01-26 | International Business Machines Corporation | System and method of compression and decompression using store addressing |
CA2263711A1 (en) * | 1996-09-10 | 1998-03-19 | Imperial Chemical Industries Plc | Fluorination catalyst and process |
EP0957074B2 (en) * | 1997-04-23 | 2006-01-11 | Asahi Glass Company Ltd. | Process for producing halogenated hydrocarbons |
EP1000002A1 (en) * | 1997-07-31 | 2000-05-17 | Imperial Chemical Industries Plc | Vapour phase preparation of 1,1,1,2,3,3,3-heptafluoropropane |
JP3552887B2 (ja) * | 1997-10-09 | 2004-08-11 | ダイキン工業株式会社 | 1,1,1,2,2−ペンタフルオロエタンの製造方法 |
JP3520900B2 (ja) * | 1997-12-12 | 2004-04-19 | ダイキン工業株式会社 | ペンタフルオロエタンの製造方法、並びにフッ素化用触媒及びその製造方法 |
JP2003528723A (ja) * | 2000-03-31 | 2003-09-30 | カウンシル・オブ・サイエンティフィック・アンド・インダストリアル・リサーチ | 1,1,1,2−テトラフルオロエタンの調製のためのプロセス |
US7485598B2 (en) * | 2006-06-21 | 2009-02-03 | Arkema Inc. | High pressure catalyst activation method and catalyst produced thereby |
RU2004102799A (ru) * | 2001-06-28 | 2005-06-27 | Хонейвелл Интернэшнл, Инк. (Us) | Способ получения катализатора фторирования |
FR2828193B1 (fr) | 2001-08-03 | 2004-04-02 | Atofina | Nouveau procede de preparation du 1,1,1,-trifluoro-2,2-dichloroethane |
KR101125343B1 (ko) * | 2003-10-14 | 2012-03-27 | 이 아이 듀폰 디 네모아 앤드 캄파니 | 1,1,1,2,3,3-헥사플루오로프로판 및1,1,1,2,3,3,3-헵타플루오로프로판 중 1종 이상 및1,1,1,3,3,3-헥사플루오로프로판의 제조 방법 |
US7285690B2 (en) | 2003-10-14 | 2007-10-23 | E.I. Du Pont De Nemours And Company | Process for the preparation of 1,1,1,3,3-pentafluoropropane and 1,1,1,3,3,3-hexafluoropropane |
AU2004281281A1 (en) * | 2003-10-14 | 2005-04-28 | E.I. Dupont De Nemours And Company | Process for the preparation of 1,1,1,3,3-pentafluoropropane and 1,1,1,2,3-pentafluoropropane |
WO2005037431A1 (en) | 2003-10-14 | 2005-04-28 | E.I. Dupont De Nemours And Company | Chromium oxide compositions containing zinc, their preparation, and their use as catalysts and catalyst precursors |
WO2005058489A1 (en) * | 2003-12-16 | 2005-06-30 | E.I. Dupont De Nemours And Company | Selective chromium catalyst compositions, their preparation and use for producing 1,1,2-trichloropentafluoropropane |
CN100372607C (zh) * | 2004-12-23 | 2008-03-05 | 西安近代化学研究所 | 氟化催化剂及其制造方法和用途 |
DE102005012632A1 (de) * | 2005-03-18 | 2006-09-21 | Infineon Technologies Ag | Verfahren und Schaltungsanordnung zur geschützten Übertragung von Datenworten |
GB0507139D0 (en) | 2005-04-08 | 2005-05-18 | Ineos Fluor Holdings Ltd | Catalyst |
CN1911512B (zh) * | 2005-07-07 | 2011-12-07 | 独立行政法人产业技术综合研究所 | 氟化催化剂及其制备方法、以及使用了该催化剂的氟化合物的制备方法 |
CN100434166C (zh) * | 2005-09-09 | 2008-11-19 | 北京宇极科技发展有限公司 | 氢氟烃的制备工艺及其专用催化剂的制备方法 |
CN100427207C (zh) * | 2005-09-12 | 2008-10-22 | 山东东岳化工有限公司 | 用于气相法生产1,1一二氟乙烷的催化剂 |
CN1308072C (zh) * | 2005-09-30 | 2007-04-04 | 山东东岳化工有限公司 | 一种用于1,1,1,2-四氟乙烷的铁系铬基催化剂 |
GB0525699D0 (en) | 2005-12-17 | 2006-01-25 | Ineos Fluor Holdings Ltd | Process |
GB0525700D0 (en) | 2005-12-17 | 2006-01-25 | Ineos Fluor Holdings Ltd | Process |
GB0525701D0 (en) | 2005-12-17 | 2006-01-25 | Ineos Fluor Holdings Ltd | Process |
EP2129644B1 (en) * | 2006-10-03 | 2020-07-01 | Mexichem Fluor S.A. de C.V. | Dehydrogenationhalogenation process for the production of c3-c6-(hydro)fluoroalkenes |
GB0806422D0 (en) | 2008-04-09 | 2008-05-14 | Ineos Fluor Holdings Ltd | Process |
GB0625214D0 (en) | 2006-12-19 | 2007-01-24 | Ineos Fluor Holdings Ltd | Process |
GB0706978D0 (en) | 2007-04-11 | 2007-05-16 | Ineos Fluor Holdings Ltd | Process |
GB0721991D0 (en) * | 2007-11-09 | 2007-12-19 | Ineos Fluor Holdings Ltd | Preparation method |
GB0806419D0 (en) * | 2008-04-09 | 2008-05-14 | Ineos Fluor Holdings Ltd | Process |
GB0806389D0 (en) * | 2008-04-09 | 2008-05-14 | Ineos Fluor Holdings Ltd | Process |
GB0808836D0 (en) | 2008-05-15 | 2008-06-18 | Ineos Fluor Ltd | Process |
JP5128706B2 (ja) * | 2008-09-05 | 2013-01-23 | メキシケム、アマンコ、ホールディング、ソシエダッド、アノニマ、デ、カピタル、バリアブレ | 触媒および該触媒を使用する方法 |
GB0816208D0 (en) | 2008-09-05 | 2008-10-15 | Ineos Fluor Holdings Ltd | Catlyst and process using the catalyst |
GB0906191D0 (en) | 2009-04-09 | 2009-05-20 | Ineos Fluor Holdings Ltd | Process |
US8158549B2 (en) * | 2009-09-04 | 2012-04-17 | Honeywell International Inc. | Catalysts for fluoroolefins hydrogenation |
US9302961B2 (en) * | 2011-01-21 | 2016-04-05 | Arkema France | Catalytic gas phase fluorination |
MX343621B (es) | 2011-01-21 | 2016-11-11 | Arkema France | Fluoracion catalitica en fase gas. |
GB2492847A (en) | 2011-07-15 | 2013-01-16 | Mexichem Amanco Holding Sa | A process for reducing TFMA content in R-1234 |
CN103842075B (zh) | 2011-10-12 | 2016-08-17 | 拜耳知识产权有限责任公司 | 1,1,2-三氯乙烷和/或1,2-二氯乙烯催化气相氟化制备1-氯-2,2-二氟乙烷 |
GB2540421C (en) | 2015-07-17 | 2018-11-14 | Mexichem Fluor Sa De Cv | Process for preparing 245cb from 243db |
GB2540427B (en) | 2015-07-17 | 2017-07-19 | Mexichem Fluor Sa De Cv | Process for the preparation of 2,3,3,3-tetrafluoropropene (1234yf) |
GB2540428B (en) | 2015-07-17 | 2017-09-13 | Mexichem Fluor Sa De Cv | Process for preparing 3,3,3-trifluoropropene |
CN105688890B (zh) * | 2016-02-01 | 2019-03-01 | 乳源东阳光氟有限公司 | 一种氟化催化剂及其制备方法 |
FR3055221B1 (fr) | 2016-08-29 | 2023-12-15 | Arkema France | Compositions de catalyseurs d'oxyfluorure ou de fluorure de chrome, leur preparation et leur utilisation dans des procedes en phase gazeuse |
GB201615197D0 (en) | 2016-09-07 | 2016-10-19 | Mexichem Fluor Sa De Cv | Catalyst and process using the catalyst |
GB201615209D0 (en) | 2016-09-07 | 2016-10-19 | Mexichem Fluor Sa De Cv | Catalyst and process using the catalyst |
JP6753434B2 (ja) * | 2018-06-13 | 2020-09-09 | ダイキン工業株式会社 | ジフルオロエチレンの製造方法 |
JP7534042B2 (ja) * | 2018-11-08 | 2024-08-14 | 福建永晶科技股▲ふん▼有限公司 | 1,1,1-トリフルオロ-2-クロロエタン(HCFC-133a)及び/又はトリフルオロエチルアミン(TFEA)の新しい製造方法 |
GB2580623A (en) * | 2019-01-17 | 2020-07-29 | Mexichem Fluor Sa De Cv | Method |
JP7123958B2 (ja) * | 2019-02-15 | 2022-08-23 | 福建永晶科技股▲ふん▼有限公司 | フルオロアリール化合物及びその誘導体の新しい製造方法 |
JP7353013B2 (ja) | 2019-08-29 | 2023-09-29 | フジアン ヨンジン テクノロジー カンパニー リミテッド | フルオロベンゼンおよびその触媒の製造プロセス |
CN111604092B (zh) * | 2020-06-16 | 2022-12-06 | 中国民航大学 | 一种铬单原子氟化催化剂的制备方法及其应用 |
Family Cites Families (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2876265A (en) * | 1959-03-03 | Process of preparation of unsaturated | ||
US1668838A (en) * | 1926-06-21 | 1928-05-08 | Commercial Solvents Corp | Zinc oxide catalysts |
US1996115A (en) * | 1931-05-29 | 1935-04-02 | Du Pont | Alkyl halide synthesis |
US2436143A (en) * | 1946-07-16 | 1948-02-17 | Du Pont | Preparation of fluoroalkanes |
GB1017647A (en) * | 1963-05-22 | 1966-01-19 | British Petroleum Co | Mixtures of carbon dioxide and hydrogen |
NL148035B (nl) * | 1965-09-14 | 1975-12-15 | Montedison Spa | Werkwijze voor de bereiding van gefluoreerde en/of gechlorofluoreerde organische verbindingen. |
GB1307224A (en) * | 1969-06-27 | 1973-02-14 | Ici Ltd | Chromium oxide catalyst |
SE374675B (no) * | 1970-06-10 | 1975-03-17 | Montedison Spa | |
JPS557414B2 (no) * | 1972-08-31 | 1980-02-25 | ||
US3878257A (en) * | 1973-08-10 | 1975-04-15 | Du Pont | Catalytic conversion of 1,1,2-trichlorotrifluoropropene-1 to 2-chloropentafluoropropene |
GB1589924A (en) * | 1977-02-17 | 1981-05-20 | Ici Ltd | Manufacture of 1,1,1,2-tetrafluoroethane halogenated compounds |
US4180516A (en) * | 1977-08-18 | 1979-12-25 | Mobil Oil Corporation | Conversion of synthesis gas to aromatic hydrocarbons |
JPS5434712A (en) * | 1977-08-24 | 1979-03-14 | Hitachi Ltd | Deflection yoke |
US4312780A (en) * | 1980-09-15 | 1982-01-26 | Air Products And Chemicals, Inc. | Reactivation of spent chromia-alumina catalyst by zinc oxide doping |
DE3036044A1 (de) * | 1980-09-24 | 1982-05-06 | Siemens AG, 1000 Berlin und 8000 München | Optischer stern-koppler mit planarem mischerelement |
DE3362621D1 (en) * | 1982-11-22 | 1986-04-24 | Shell Int Research | Catalyst preparation |
JP2695042B2 (ja) * | 1989-02-03 | 1997-12-24 | イー・アイ・デュポン・ドウ・ヌムール・アンド・カンパニー | 1,1,1,2―テトラフルオロエタンの製造 |
JP2751401B2 (ja) * | 1989-05-24 | 1998-05-18 | 旭硝子株式会社 | 1,1‐ジクロロ‐1,2,2,2―テトラフルオロエタンの製造方法 |
IT1230779B (it) * | 1989-07-12 | 1991-10-29 | Ausimont Srl | Procedimento per preparare 1,1,1,2 tetrafluoroetano. |
US5243107A (en) * | 1990-03-29 | 1993-09-07 | Imperial Chemical Industries Plc | Chemical process |
GB9104775D0 (en) * | 1991-03-07 | 1991-04-17 | Ici Plc | Fluorination catalyst and process |
JPH1180838A (ja) * | 1997-09-10 | 1999-03-26 | Nippon Seiko Kk | 転がり軸受 |
-
1991
- 1991-03-07 GB GB919104775A patent/GB9104775D0/en active Pending
-
1992
- 1992-01-15 GB GB929200841A patent/GB9200841D0/en active Pending
- 1992-01-20 IE IE920163A patent/IE75727B1/en not_active IP Right Cessation
- 1992-01-20 ZA ZA92396A patent/ZA92396B/xx unknown
- 1992-01-21 CS CS92171A patent/CS17192A3/cs unknown
- 1992-01-21 IN IN47DE1992 patent/IN185352B/en unknown
- 1992-01-21 AU AU10324/92A patent/AU658161B2/en not_active Ceased
- 1992-01-21 MY MYPI92000087A patent/MY108102A/en unknown
- 1992-01-21 US US07/822,279 patent/US5281568A/en not_active Expired - Lifetime
- 1992-01-22 FI FI920273A patent/FI920273A/fi not_active Application Discontinuation
- 1992-01-22 NO NO92920299A patent/NO920299L/no unknown
- 1992-01-23 AT AT95106618T patent/ATE313377T1/de not_active IP Right Cessation
- 1992-01-23 ES ES95106618T patent/ES2255705T3/es not_active Expired - Lifetime
- 1992-01-23 DK DK92300563.1T patent/DK0502605T3/da active
- 1992-01-23 EP EP03076853A patent/EP1350564A1/en not_active Withdrawn
- 1992-01-23 DE DE69233583T patent/DE69233583T2/de not_active Expired - Lifetime
- 1992-01-23 AT AT92300563T patent/ATE140399T1/de active
- 1992-01-23 EP EP92300563A patent/EP0502605B1/en not_active Expired - Lifetime
- 1992-01-23 ES ES92300563T patent/ES2089381T3/es not_active Expired - Lifetime
- 1992-01-23 SG SG1996005039A patent/SG50565A1/en unknown
- 1992-01-23 EP EP95106618A patent/EP0666105B1/en not_active Expired - Lifetime
- 1992-01-23 DE DE69212183T patent/DE69212183T2/de not_active Expired - Lifetime
- 1992-01-24 CN CN92101187A patent/CN1064628A/zh active Pending
- 1992-01-24 HU HU9200220A patent/HUT63825A/hu unknown
- 1992-01-24 PL PL29328392A patent/PL293283A1/xx unknown
- 1992-01-24 CA CA002059983A patent/CA2059983C/en not_active Expired - Fee Related
- 1992-01-28 JP JP4013203A patent/JPH05220400A/ja active Pending
- 1992-02-10 YU YU13292A patent/YU13292A/sh unknown
- 1992-02-13 RU SU925010862A patent/RU2032464C1/ru active
- 1992-03-07 KR KR1019920003791A patent/KR100217353B1/ko not_active IP Right Cessation
-
1993
- 1993-07-08 US US08/087,379 patent/US5449656A/en not_active Expired - Lifetime
-
1995
- 1995-01-25 US US08/377,707 patent/US5623092A/en not_active Expired - Lifetime
- 1995-11-14 CN CN95119833A patent/CN1049647C/zh not_active Expired - Lifetime
-
1996
- 1996-09-06 GR GR960402328T patent/GR3020970T3/el unknown
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