COMPOUNDS FOR DIELECTRICALLY INSULATING ELECTRIC ACTIVE PARTS

Abstract

The invention concerns compounds, gas mixtures as well as methods for dielectrically insulating electric active parts using certain fluorinated peroxide compounds.

Claims

1. A compound of the general formula R1-OOR2 wherein R1 and R2 are independently selected from the group consisting of perfluorinated and partially fluorinated methyl, ethyl, isopropyl, n-propyl, isobutyl, n-butyl and tert-butyl, with the proviso that if R1 is CF.sub.3, R2 is not CF.sub.3.

2. The compound of claim 1 wherein the R1 and R2 are independently selected from the group consisting of perfluorinated methyl, ethyl, isopropyl, n-propyl, isobutyl, n-butyl and tert-butyl.

3. The compound of claim 1 wherein the compound is CF.sub.3CF.sub.2OOCF.sub.2CF.sub.3, (CF.sub.3).sub.2CFOOCF(CF.sub.3).sub.2, CF.sub.3OOCF.sub.2CF.sub.3, or CF.sub.3OOCF(CF.sub.3).sub.2.

4. The compound of claim 1 wherein the compound has a standard boiling point of less than 20 C.

5. A gas mixture of two or more compounds of the general formula R1-OOR2 wherein R1 and R2 are independently selected from the group consisting of perfluorinated and partially fluorinated methyl, ethyl, isopropyl, n-propyl, isobutyl, n-butyl and tert-butyl.

6. The gas mixture of claim 5 wherein the two or more compounds are selected from the group consisting of CF.sub.3OOCF.sub.3, CF.sub.3CF.sub.2OOCF.sub.2CF.sub.3, (CF.sub.3).sub.2CFOOCF(CF.sub.3).sub.2, CF.sub.3OOCF.sub.2CF.sub.3, or CF.sub.3OOCF(CF.sub.3).sub.2.

7. The gas mixture of claim 5 further comprising at least one compound selected from the group consisting of an inert gas, a perfluorinated ketone partially fluorinated ketone, a perfluorinated ether, partially fluorinated ether, a perfluorinated ester, partially fluorinated ester, a perfluorinated cyano compound, partially fluorinated cyano compound, and a hydrocarbon compound.

8. The gas mixture of claim 7 wherein the at least one compound is an inert gas selected from the group consisting of air, synthetic air, an air component, N.sub.2, O.sub.2, CO.sub.2, N.sub.2O, He, Ne, Ar, Xe and SF.sub.6.

9. A method for dielectrically insulating an electric active part wherein the active electrical part is arranged in a gas-tight housing comprising the compound according to claim 1.

10. A process for the manufacture of a compound of general formula R1-OOR1 wherein R1 is selected from the group consisting of perfluorinated and partially fluorinated methyl, ethyl, isopropyl, n-propyl, isobutyl, n-butyl and tert-butyl; the process comprising a step of reacting a compound of the general formula R3-C(O)F, wherein R3 is selected from the group consisting of perfluorinated and partially fluorinated methyl, ethyl, isopropyl and n-propyl, with F.sub.2 or COF.sub.2 and F.sub.2.

11. The process of claim 10 wherein the step of reacting a compound of the general formula R3-C(O)F is carried out in the presence of a metal fluoride.

12. (canceled)

13. An apparatus for the generation, distribution and/or usage of electrical energy wherein the apparatus comprises an electrical active part arranged in a gas-tight housing and said gas-tight housing containing an insulating medium comprising or consisting of the compound of claim 1.

14. The apparatus of claim 13 wherein the apparatus is a switchgear.

15. The compound of claim 4 wherein the compound has a standard boiling point equal to or lower than 0 C.

16. The gas mixture of claim 8 wherein the at least one compound is N.sub.2.

17. A method for dielectrically insulating an electric active part wherein the active electrical part is arranged in a gas-tight housing comprising the gas mixture according to claim 5.

18. An apparatus for the generation, distribution and/or usage of electrical energy wherein the apparatus comprises an electrical active part arranged in a gas-tight housing and said gas-tight housing containing an insulating medium comprising or consisting of the gas mixture of claim 5.

Description

EXAMPLES

Example 1a: Manufacture of CF.SUB.3.OOCF.SUB.3

[0048] CF.sub.3OOCF.sub.3 is manufactured as described in Example 3 of US-A-2007/0049774.

Example 1b: Manufacture of CF.SUB.3.CF.SUB.2.OOCF.SUB.3

[0049] An equimolar mixture of carbonyl fluoride (COF.sub.2) and trifluoroacetyl fluoride (CF.sub.3C(O)F) is treated with 1.1 equivalents F.sub.2 in a Monel 400 continuous flow reactor in the presence of silver fluoride (AgF, 1.0 eq) at room temperature.

Example 1c: Manufacture of CF.SUB.3.CF.SUB.2.OOCF.SUB.3

[0050] An equimolar mixture of carbonyl fluoride (COF.sub.2) and pentafluoroethyl oxyfluoride (CF.sub.3CF.sub.2OF) is allowed to react in a static reactor made from Monel 400 in the presence of silver fluoride (AgF, 1.0 eq) at 25 C. for 24 hours.

Example 1d: Manufacture of CF.SUB.3.CF.SUB.2.OOCF.SUB.2.CF.SUB.3

[0051] Trifluoroacetyl fluoride (CF.sub.3C(O)F) is treated in a Monel 400 continuous flow reactor with a 1.1 equivalents F.sub.2 in the presence of silver fluoride (AgF, 1.0 eq) at room temperature.

Example 1e: Manufacture of CF.SUB.3.CF.SUB.2.OOCF.SUB.2.CF.SUB.3

[0052] An equimolar mixture of pentafluoroethyl oxyfluoride (CF.sub.3CF.sub.2OF) and trifluoroacetyl fluoride (CF.sub.3C(O)F) is heated to 140 C. in a static reactor made from Monel 400 in the presence of silver fluoride (AgF, 1.0 eq).

Example 1f: Manufacture of the Mixtures of Perfluorinated Peroxides Like CF.SUB.3.CF.SUB.2.OOCF.SUB.3., CF.SUB.3.CF.SUB.2.OOCF.SUB.2.CF.SUB.3., CF.SUB.3.OOCF.SUB.3

[0053] A flow comprising CO (1 eq) and F.sub.2 (1.05 eq) is ignited. Subsequently, a flow consisting of trifluoroacetyl fluoride (CF.sub.3C(O)F, 1.0 eq) is mixed into the aforementioned flow and the combined flows are directed over a bed of silver fluoride (AgF). The reaction product is trapped in a cold trap at 78 C.

Example 2: Manufacture of the Gas Mixtures

[0054] As described in WO9823363, a homogenous gas mixture consisting of CF.sub.3CF.sub.2OOCF.sub.2CF.sub.3 and N.sub.2 in a volume ratio 1:4 is manufactured in an apparatus comprising a static mixer and a compressor.

Example 3: Provision of an Earth Cable Containing the Dielectric Insulating Gas of Example 2

[0055] The gas mixture of example 2 is directly fed into an earth cable for high voltage, until a total pressure of 10 bar (abs) in the cable is achieved.

Example 4: A Switchgear Containing CF.SUB.3.CF.SUB.2.OOCF.SUB.2.CF.SUB.3., and N.SUB.2 .in a Volume Ratio 1:4

[0056] A switchgear is used which contains a switch surrounded by a gas tight metal case. The gas mixture of example 2 is passed into the gas tight metal case via a valve until a pressure of 18 bar (abs) is achieved.

Example 5: Provision of a Gas-Insulated Transmission Line Containing the Dielectric Insulating Gas of Example 3

[0057] The gas mixture of example 2 is directly fed into an earth cable for high voltage, until a total pressure of 10 bar (abs) in the cable is achieved.