NO20053163L - Kjolerkuldemedier. - Google Patents

Kjolerkuldemedier.

Info

Publication number
NO20053163L
NO20053163L NO20053163A NO20053163A NO20053163L NO 20053163 L NO20053163 L NO 20053163L NO 20053163 A NO20053163 A NO 20053163A NO 20053163 A NO20053163 A NO 20053163A NO 20053163 L NO20053163 L NO 20053163L
Authority
NO
Norway
Prior art keywords
mixture
weight
composition
amount
coolants
Prior art date
Application number
NO20053163A
Other languages
English (en)
Other versions
NO20053163D0 (no
Inventor
Owen Ross Chambers
Neil Andre Roberts
Original Assignee
Rhodia Organique Fine Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB0227891A external-priority patent/GB0227891D0/en
Priority claimed from GB0228306A external-priority patent/GB0228306D0/en
Application filed by Rhodia Organique Fine Ltd filed Critical Rhodia Organique Fine Ltd
Publication of NO20053163D0 publication Critical patent/NO20053163D0/no
Publication of NO20053163L publication Critical patent/NO20053163L/no

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
    • C09K5/02—Materials undergoing a change of physical state when used
    • C09K5/04—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
    • C09K5/02—Materials undergoing a change of physical state when used
    • C09K5/04—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa
    • C09K5/041—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa for compression-type refrigeration systems
    • C09K5/044—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa for compression-type refrigeration systems comprising halogenated compounds
    • C09K5/045—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa for compression-type refrigeration systems comprising halogenated compounds containing only fluorine as halogen

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Amplifiers (AREA)
  • Saccharide Compounds (AREA)

Abstract

Kjølemiddelsammensetning er vist hvilket omfatter: a) pentafluoroetan, trifluorometoksydifluorometan eller heksaflurorocyclopropan, eller en blanding av to eller flere derav, i en mengde fra 60 til 70 % ved vekt basert på sammensetningens vekt, (b) 1,1,1,2- eller 1,1,2,2-tetrafluoroetan, trifluorometoksypentafluoroetan, 1,1,1,2,3,3-heptafluoropropan eller en blanding av to eller flere derav, i en mengde fra 26 til 36 % ved vekt basert på vekten av sammensetningen og (c) et etylenisk umettet eller mettet hydrokarbon, eventuelt inneholdende ett eller flere oksygenatomer, med et kokepunkt fra -12ºC til + 10ºC, eller en blanding derav, eller en blanding av en eller flere av nevnte hydrokarboner med en eller flere andre hydrokarboner, nevnte blanding har et boblepunkt fra -12ºC til +10ºC, i en mengde fra 1 % til 4 % ved vekt basert på vekten av sammensetningen.
NO20053163A 2002-11-29 2005-06-28 Kjolerkuldemedier. NO20053163L (no)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB0227891A GB0227891D0 (en) 2002-11-29 2002-11-29 Chiller refrigerants
GB0228306A GB0228306D0 (en) 2002-12-04 2002-12-04 Chiller refrigerants
PCT/GB2003/005227 WO2004050787A1 (en) 2002-11-29 2003-12-01 Chiller refrigerants

Publications (2)

Publication Number Publication Date
NO20053163D0 NO20053163D0 (no) 2005-06-28
NO20053163L true NO20053163L (no) 2005-08-29

Family

ID=32472142

Family Applications (1)

Application Number Title Priority Date Filing Date
NO20053163A NO20053163L (no) 2002-11-29 2005-06-28 Kjolerkuldemedier.

Country Status (17)

Country Link
US (7) US20060151740A1 (no)
EP (2) EP1572829B1 (no)
JP (1) JP4838513B2 (no)
KR (1) KR101126495B1 (no)
CN (1) CN101838519A (no)
AT (1) ATE532841T1 (no)
AU (2) AU2003285568B2 (no)
BR (1) BR0316696B1 (no)
CA (1) CA2507639C (no)
ES (1) ES2374288T3 (no)
HK (1) HK1087429A1 (no)
MX (1) MXPA05005692A (no)
NO (1) NO20053163L (no)
PL (1) PL208354B1 (no)
PT (1) PT1572829E (no)
RU (1) RU2334776C2 (no)
WO (1) WO2004050787A1 (no)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0223724D0 (en) 2002-10-11 2002-11-20 Rhodia Organique Fine Ltd Refrigerant compositions
KR101126495B1 (ko) 2002-11-29 2012-03-29 이 아이 듀폰 디 네모아 앤드 캄파니 냉각기 냉매
CN1878849B (zh) * 2003-11-13 2014-12-24 纳幕尔杜邦公司 用于降低易燃致冷剂的火灾危害性的组合物和方法
JP2007107858A (ja) * 2005-10-17 2007-04-26 Sanyo Electric Co Ltd 冷凍装置
JP2010513671A (ja) * 2006-12-21 2010-04-30 イー・アイ・デュポン・ドウ・ヌムール・アンド・カンパニー ペンタフルオロエタン、テトラフルオロエタンおよび炭化水素の組成物
BRPI0719479B8 (pt) * 2006-12-23 2017-06-27 Du Pont sistema de transferência de calor, refrigerador, câmara frigorífica, resfriador, expositor de produtos, congelador, equipamento de ar condicionado, método para retroajustar um sistema de transferência de calor e sistema de refrigeração ou condicionamento de ar
GB201002625D0 (en) * 2010-02-16 2010-03-31 Ineos Fluor Holdings Ltd Heat transfer compositions
EP2291483A1 (en) * 2008-04-15 2011-03-09 E. I. du Pont de Nemours and Company Pentafluoroethane, tetrafluoroethane and n-butane compositions
GB0906547D0 (en) * 2009-04-16 2009-05-20 Ineos Fluor Holdings Ltd Heat transfer compositions
US8444873B2 (en) 2009-06-12 2013-05-21 Solvay Fluor Gmbh Refrigerant composition
FR2950069B1 (fr) * 2009-09-11 2011-11-25 Arkema France Utilisation de compositions ternaires
GB201002622D0 (en) * 2010-02-16 2010-03-31 Ineos Fluor Holdings Ltd Heat transfer compositions
US20130255302A1 (en) * 2012-03-30 2013-10-03 James B. Tieken Cleaning composition and method for refrigeration system
WO2014004665A2 (en) 2012-06-27 2014-01-03 Gws Energy, Inc. Hydrocarbon based refrigerant
WO2014117014A2 (en) 2013-01-25 2014-07-31 Trane International Inc. Refrigerant additives and compositions
US8999191B2 (en) 2013-03-15 2015-04-07 National Refrigerants, Inc. R22 replacement refrigerant
US11028300B1 (en) 2020-09-16 2021-06-08 David L. Couchot Environmentally friendly refrigerant compositions

Family Cites Families (85)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB101717A (en) 1915-10-02 1917-08-09 Charles Frederic Larsen Improvements in Devices for Lighting Gas and like purposes.
US3779842A (en) 1972-04-21 1973-12-18 Macdermid Inc Method of and composition for dissolving metallic copper
US3869401A (en) 1972-12-04 1975-03-04 Du Pont Stabilized acidic hydrogen peroxide solutions
GB1446816A (en) 1973-05-02 1976-08-18 Furukawa Electric Co Ltd Chemical dissolution treatment of tin or alloys thereof
JPS5177404A (no) 1974-12-26 1976-07-05 Fuji Photo Film Co Ltd
US4349411A (en) 1981-10-05 1982-09-14 Bell Telephone Laboratories, Incorporated Etch procedure for aluminum alloy
DE3623504A1 (de) 1986-07-09 1988-01-21 Schering Ag Kupferaetzloesungen
JPH0655941B2 (ja) 1987-10-19 1994-07-27 ダイキン工業株式会社 冷 媒
US4755316A (en) * 1987-10-23 1988-07-05 Allied-Signal Inc. Refrigeration lubricants
JP2576161B2 (ja) 1987-11-26 1997-01-29 旭硝子株式会社 作動媒体混合物
JP2576162B2 (ja) 1987-11-26 1997-01-29 旭硝子株式会社 作動媒体混合物
GB8824571D0 (en) 1988-10-20 1988-11-23 Ici Plc Chemical process
US4944890A (en) 1989-05-23 1990-07-31 E. I. Du Pont De Nemours And Company Compositions and process of using in refrigeration
US5032306A (en) 1989-09-07 1991-07-16 E. I. Du Pont De Nemours And Company Fluorinated hydrocarbon lubricants for use with refrigerants in compression refrigeration
FR2662944B2 (fr) 1989-11-10 1992-09-04 Atochem Nouveau melange azeotropique a bas point d'ebullition a base de fluoroalcanes et ses applications.
US5342501A (en) 1989-11-21 1994-08-30 Eric F. Harnden Method for electroplating metal onto a non-conductive substrate treated with basic accelerating solutions for metal plating
EP0430131A1 (en) 1989-11-29 1991-06-05 Matsushita Electric Industrial Co., Ltd. Working fluid
JP2584337B2 (ja) 1990-05-11 1997-02-26 三洋電機株式会社 冷媒組成物
FR2664044B1 (fr) 1990-06-29 1993-05-14 Sextant Avionique Procede et dispositif de determination d'une orientation liee a un systeme mobile, notamment de la ligne de visee dans un viseur de casque.
DE69118208T2 (de) * 1990-07-26 1996-09-05 E.I. Du Pont De Nemours And Co., Wilmington, Del. Quasi-azeotrope Mischungen zur Verwendung als Kältemittel
GB2247462A (en) 1990-08-29 1992-03-04 Star Refrigeration Two component refrigerant
GB9026512D0 (en) 1990-12-05 1991-01-23 Star Refrigeration Multi-component refrigerant
US5520833A (en) 1991-06-28 1996-05-28 Idemitsu Kosan Co., Ltd. Method for lubricating compression-type refrigerating cycle
ES2086127T5 (es) 1991-07-03 1999-11-01 Du Pont Composiciones azeotropicas o semejantes a azeotropos de pentafluoroetano y propano o isobutano.
JP2568774B2 (ja) * 1991-10-28 1997-01-08 松下電器産業株式会社 作動流体
AU3602193A (en) 1992-02-03 1993-09-01 Allied-Signal Inc. Novel refrigerant compositions
EP0565265B1 (en) 1992-04-04 1995-12-13 Star Refrigeration Ltd. Refrigerant composition
US5225034A (en) 1992-06-04 1993-07-06 Micron Technology, Inc. Method of chemical mechanical polishing predominantly copper containing metal layers in semiconductor processing
IL106132A0 (en) 1992-06-25 1993-10-20 Great Lakes Chemical Corp Refrigerant composition containing 1,1,1,2,3,3,3-heptafluoropropane and methods utilizing the same
US5259979A (en) 1993-01-13 1993-11-09 Oliver Sales Company Process for regeneration of cleaning compounds
GB9319540D0 (en) 1993-09-22 1993-11-10 Star Refrigeration Replacement refrigerant composition
JPH07173460A (ja) 1993-12-20 1995-07-11 Sanyo Electric Co Ltd 冷媒組成物および冷凍装置
US5417871A (en) * 1994-03-11 1995-05-23 E. I. Du Pont De Nemours And Company Hydrofluorocarbon compositions
ES2214487T5 (es) 1994-07-19 2009-06-15 Nippon Mitsubishi Oil Corporation Composicion de un aceite refrigerante y composicion liquida para refrigerador.
GB9415159D0 (en) 1994-07-27 1994-09-28 Ici Plc Refrigerant compositions
GB9415140D0 (en) * 1994-07-27 1994-09-14 Ici Plc Refrigerant compositions
US6251300B1 (en) 1994-08-03 2001-06-26 Nippon Mitsubishi Oil Corporation Refrigerator oil compositions and fluid compositions for refrigerator
US5866030A (en) 1994-09-07 1999-02-02 Witco Corporation Enhanced hydrocarbon lubricants for use with immiscible refrigerants
WO1996015205A1 (en) 1994-11-16 1996-05-23 E.I. Du Pont De Nemours And Company Compositions that include a cyclic fluorocarbon
JP3575089B2 (ja) 1994-12-12 2004-10-06 旭硝子株式会社 非共沸混合冷媒を形成する方法
RU2072382C1 (ru) 1994-12-26 1997-01-27 Олег Николаевич Подчерняев Озонобезопасная рабочая смесь
JPH0925480A (ja) 1995-07-13 1997-01-28 Sanyo Electric Co Ltd 作動流体
JPH0959611A (ja) 1995-08-28 1997-03-04 Sanyo Electric Co Ltd 冷媒組成物
AU7239596A (en) 1995-09-21 1997-04-09 George H. Goble Drop-in substitutes for dichlorodifluoromethane refrigerant
KR0184083B1 (ko) 1995-10-20 1999-04-01 이기태 흡입관 열교환기를 사용하는 냉동기용 혼합냉매
CN1083474C (zh) 1995-10-24 2002-04-24 顾雏军 在热力循环中使用的改进的非共沸工作介质
JPH09125052A (ja) 1995-11-02 1997-05-13 Matsushita Refrig Co Ltd 冷凍システム
IT1277085B1 (it) 1995-12-14 1997-11-04 Ausimont Spa Composizioni ternarie quasi azeotropiche costituite da fluorocarburi idrogenati e idrocarburi adatte come fluidi refrigeranti
US5954995A (en) 1996-03-22 1999-09-21 Goble; George H. Drop-in substitutes for 1,1,1,2-tetrafluoroethane (R-134a) refrigerant
US5705086A (en) 1996-04-16 1998-01-06 Mobil Oil Corporation Refrigeration oils comprising esters of hindered alcohols
US5984079A (en) 1996-07-12 1999-11-16 Electro Scientific Industries, Inc. Method and apparatus for loading electronic components
US5958288A (en) 1996-11-26 1999-09-28 Cabot Corporation Composition and slurry useful for metal CMP
GB9624818D0 (en) 1996-11-28 1997-01-15 Rh Ne Poulenc Chemicals Ltd Refrigerant composition
DE69731395T2 (de) 1996-11-29 2005-03-24 Nitto Denko Corp., Ibaraki Wärmeleitender, druckempfindlicher klebstoff und klebstoffschicht die diesen enthält
JP3127138B2 (ja) 1997-01-31 2001-01-22 昭和電工株式会社 混合冷媒の製造方法
TW492999B (en) 1997-01-31 2002-07-01 Showa Denko Kk Process for preparing mixed cooling-media
BR9811011B1 (pt) * 1997-07-15 2010-07-27 composição refrigerante, processo para a produção de refrigeração, e, equipamento de refrigeração.
US6000230A (en) 1997-08-19 1999-12-14 Showa Denko K.K. Method for dividing and charging of non-azeotropic mixed refrigerant
US6222136B1 (en) 1997-11-12 2001-04-24 International Business Machines Corporation Printed circuit board with continuous connective bumps
RU2135541C1 (ru) 1997-12-10 1999-08-27 Российский научный центр "Прикладная химия" Композиция хладагента
JP3754198B2 (ja) 1997-12-25 2006-03-08 三洋電機株式会社 可燃性冷媒組成物の処理装置
US6065305A (en) 1998-12-30 2000-05-23 Praxair Technology, Inc. Multicomponent refrigerant cooling with internal recycle
US6076372A (en) 1998-12-30 2000-06-20 Praxair Technology, Inc. Variable load refrigeration system particularly for cryogenic temperatures
RU2161637C2 (ru) 1999-02-26 2001-01-10 Беляев Андрей Юрьевич Композиция хладагента (варианты)
US6783691B1 (en) 1999-03-22 2004-08-31 E.I. Du Pont De Nemours And Company Compositions of difluoromethane, pentafluoroethane, 1,1,1,2-tetrafluoroethane and hydrocarbons
US7258813B2 (en) 1999-07-12 2007-08-21 E.I. Du Pont De Nemours And Company Refrigerant composition
DK1216282T3 (da) 1999-09-30 2005-01-10 Rpl Holdings Ltd Kölemiddelerstatning for CFC12
DE60012029D1 (de) 1999-09-30 2004-08-12 Refrigerant Products Ltd Kuehlmittelzusammensetzung als alternative für r-12
HUP0202739A2 (en) * 1999-09-30 2002-12-28 Refrigerant Products Ltd R 22 replacement refrigerant
US6629419B1 (en) 1999-10-04 2003-10-07 Refringerant Products Ltd. CFC 12 replacement refrigerant
US6606868B1 (en) 1999-10-04 2003-08-19 Refrigerant Products, Ltd. R 22 replacement refrigerant
US6230519B1 (en) 1999-11-03 2001-05-15 Praxair Technology, Inc. Cryogenic air separation process for producing gaseous nitrogen and gaseous oxygen
KR100340186B1 (ko) * 1999-11-10 2002-06-12 박호군 디플루오로메탄, 펜타플루오로에탄 및1,1,1-트리플루오로에탄을 포함하는 냉매 혼합물
GB2356867A (en) * 1999-12-03 2001-06-06 Rhodia Ltd Refrigeration Compositions
US6253577B1 (en) 2000-03-23 2001-07-03 Praxair Technology, Inc. Cryogenic air separation process for producing elevated pressure gaseous oxygen
CN1123618C (zh) 2000-07-28 2003-10-08 清华大学 一种制冷剂
FR2813610B1 (fr) 2000-09-04 2002-10-18 Atofina Composition utilisable comme fluide frigorifique
CA2424842A1 (en) 2000-09-19 2002-03-28 Rhodia Organique Fine Limited Centrifugal compression refrigerant compositions
US6526764B1 (en) 2000-09-27 2003-03-04 Honeywell International Inc. Hydrofluorocarbon refrigerant compositions soluble in lubricating oil
EP1193305A1 (en) 2000-09-27 2002-04-03 Honeywell International Inc. Hydrofluorocarbon refrigerant compositions soluble in lubricating oil
JP2002228307A (ja) * 2001-02-01 2002-08-14 Matsushita Electric Ind Co Ltd 混合冷媒充填方法および充填された装置
JP2002308085A (ja) 2001-04-18 2002-10-23 Bosch Braking Systems Co Ltd 液圧倍力装置
JP4018484B2 (ja) 2002-08-27 2007-12-05 キヤノン株式会社 カメラ装置およびその制御方法
GB0223724D0 (en) 2002-10-11 2002-11-20 Rhodia Organique Fine Ltd Refrigerant compositions
KR101126495B1 (ko) * 2002-11-29 2012-03-29 이 아이 듀폰 디 네모아 앤드 캄파니 냉각기 냉매

Also Published As

Publication number Publication date
CA2507639A1 (en) 2004-06-17
US8246851B2 (en) 2012-08-21
AU2003285568A1 (en) 2004-06-23
JP4838513B2 (ja) 2011-12-14
AU2003285568B2 (en) 2009-02-19
US7641810B2 (en) 2010-01-05
US20120273712A1 (en) 2012-11-01
US20090127498A1 (en) 2009-05-21
US20080265204A1 (en) 2008-10-30
EP1572829B1 (en) 2011-11-09
KR20050085187A (ko) 2005-08-29
US20080078978A1 (en) 2008-04-03
PL376681A1 (pl) 2006-01-09
CA2507639C (en) 2013-08-06
NO20053163D0 (no) 2005-06-28
CN101838519A (zh) 2010-09-22
BR0316696B1 (pt) 2014-04-01
US7713434B2 (en) 2010-05-11
US20100320414A1 (en) 2010-12-23
EP2258788A3 (en) 2012-10-24
AU2009201977B2 (en) 2011-10-06
KR101126495B1 (ko) 2012-03-29
WO2004050787A1 (en) 2004-06-17
US7771610B2 (en) 2010-08-10
HK1087429A1 (en) 2006-10-13
RU2005120383A (ru) 2006-01-20
PL208354B1 (pl) 2011-04-29
ATE532841T1 (de) 2011-11-15
PT1572829E (pt) 2012-01-11
EP2258788A2 (en) 2010-12-08
RU2334776C2 (ru) 2008-09-27
US20060151740A1 (en) 2006-07-13
EP1572829A1 (en) 2005-09-14
ES2374288T3 (es) 2012-02-15
MXPA05005692A (es) 2005-10-18
US20080272330A1 (en) 2008-11-06
JP2006508235A (ja) 2006-03-09
AU2009201977A1 (en) 2009-06-11
BR0316696A (pt) 2005-10-18

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