Fluorinated nitriles as dielectric gases

A dielectric and gas technology, applied in the direction of inorganic gas, organic gas insulator, organic liquid insulator, etc., can solve the problems of reduced environmental impact, high GWP, etc.

Inactive Publication Date: 2015-05-27
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, PFC also has a high GWP, thus limiting the possi

Method used

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  • Fluorinated nitriles as dielectric gases
  • Fluorinated nitriles as dielectric gases
  • Fluorinated nitriles as dielectric gases

Examples

Experimental program
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preparation example 1

[0058] Preparation Example 1: Heptafluoroisobutyramide (CF 3 ) 2 CFCONH 2 Synthesis .

[0059] 100 grams (0.44 mol) of methyl heptafluoroisobutyrate (which was neutralized by essentially US Patent No. 2,713,593 (Brice et al.) R.E. Banks, Preparation, Properties and Industrial Applications of Organofluorine Compounds, pages 19-43 , Halsted Press, New York (1982) (R.E. Banks, Preparation, properties and industrial applications of organofluorine compounds, pp. 19-43, Halsted Press, New York, 1982) Simons of the type described Electrochemical fluorination of isobutyric anhydride in an ECF unit followed by distillation and treatment of the resulting acid fluoride with methanol) and 100 ml of methanol were added to a 250 ml round bottom flask with a magnetic stirrer, thermocouple and dry ice condenser. 12.5 grams (0.74 mol) of ammonia was slowly bubbled into the liquid layer in the flask. The temperature was kept below 40°C. After the ammonia addition was complete,...

preparation example 2

[0060] Preparation Example 2: Synthesis of Heptafluoroisobutyronitrile (CF 3 ) 2 CFCN

[0061] 69.4 grams (0.326mol) of (CF 3 ) 2 CFCONH 2 Dissolve in 154 g of dimethylformamide. The amide / solvent mixture was added to a 500 ml 3 necked round bottom flask equipped with a top vent with manual shut off valve, thermocouple, magnetic stirrer, dry ice condenser, dry ice condenser and addition funnel. The contents of the flask were cooled to -10°C and 51 grams (0.65 mol) of pyridine was added slowly using an addition funnel. 70 grams (0.33 mol) of trifluoroacetic anhydride was slowly added to the flask using an addition funnel. The temperature was maintained at about 0°C throughout the addition. Open the shut-off valve and take material from the top while warming the autoclave to 15°C. 47.6 g of (CF 3 ) 2 CFCN, the yield is 74.9%. Structure confirmed by GC / MS, H-1 and F-19 NMR.

example 2

[0063] Preparation of 2,3,3,3-tetrafluoro-2-(trifluoromethoxy)propionitrile

[0064]

[0065] Methyl 2,3,3,3-tetrafluoro-2-methoxypropionate is commercially available (Synquest Laboratories) or produced by adding hexafluoropropylene oxide to methanol to produce Esters are prepared by known methods. Using essentially U.S. Patent No. 2,713,593 (Brice et al.) and R.E. Banks, Preparation, Properties and Industrial Applications of Organofluorine Compounds, pages 19-43, Halsted Press, New York (1982) (R.E. Banks, Preparation of Organofluorine Compounds) , Properties and Industrial Applications, pp. 19-43, Halsted Press, New York, 1982) in a Simons ECF unit of the type described by electrochemical fluorination of 2,3,3,3-tetra Methyl fluoro-2-methoxypropionate is converted to 2,3,3,3-tetrafluoro-2-(trifluoromethoxy)propionyl fluoride.

[0066] 2,3,3,3-Tetrafluoro-2-(trifluoromethoxy)propionyl fluoride (195 g) was added to a 500 mL round bottom flask. The flask was kept cool u...

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Abstract

An electrical device containing a dielectric fluid, the dielectric fluid comprising heptafluoroisobutyronitrile or 2,3,3,3-tetrafluoro-2-(trifluoromethoxy) propanenitrile.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Application No. 61 / 620,192, filed April 4, 2012, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The present invention generally relates to the use of dielectric fluids in electrical devices such as capacitors, switchgear, transformers and cables or busbars. In particular, the present invention relates to the use of heptafluoroisobutyronitrile or 2,3,3,3-tetrafluoro-2-(trifluoromethoxy)propionitrile as a dielectric fluid in electrical devices. Background technique [0004] Dielectric gases are used in various electrical devices such as, for example: transformers, cables or busbars, and circuit breakers or switchgear. See, eg, US Patent No. 7,807,074 (Luly et al.). In such electrical devices, dielectric gases are often used instead of air as electrical insulators due to their higher dielectric strength (DS). T...

Claims

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Application Information

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IPC IPC(8): H01B3/24H01B3/16H01B3/56
CPCH01B3/24H01B3/16H01B3/56
Inventor M·G·科斯特洛R·M·弗林M·J·布林斯基
Owner 3M INNOVATIVE PROPERTIES CO
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