Patent EA-002494-B1 (EA)
Title: Food grade dielectric fluid
Inventor: SAPIENZA RICHARD
IPC: H01B3/22
Filed: 1998-10-14
Abstract: 1. A process for preparing a biodegradable dielectric composition, which comprises treating an unsaturated hydrocarbon obtained from oil, said unsaturated hydrocarbon having at least about 50% olefinic groups contacts adsorbent to remove, at least, a substantial portion of the polar contaminants. 2. A process as defined in claim 1 wherein an antioxidant is added to said treated unsaturated hydrocarbon. 3. A process as defined in Claim 1 wherein said antioxidant comprises a hindered phenolic compound. 4. A process as defined in Claim 3 wherein said hindered phenolic compound comprises 2,6-di-tert-butyl-p-cresol. 5. A process as defined in Claim 3 wherein the amount of hindered phenol added to said first treated unsaturated hydrocarbon ranges from about 0.05 to about 0.5% by volume. 6. A process as defined in Claim 1 wherein further adding saturated hydrocarbon. 7. A process as defined in Claim 1 wherein said saturated hydrocarbon is selected from the group of a technical white oil, a saturated polyalphaolefin, and mixtures thereof. 8. A process as defined in Claim 6 wherein the amount of said saturated hydrocarbon added to said composition ranges from about 30 to about 90 percent by weight. 9. A process as defined in Claim 1 wherein said composition has a pour point of less than about -15 degree C. 10. A process as defined in Claim 1 wherein said composition has a dielectric strength of greater than about 35 Kv, a dissipation loss of less than about 0.08 at 25 degree C and less than about 0.25% at 100 degree C, and a viscosity of less than about 15 cSt at 40 degree C. 11. A process as defined in Claim 1 wherein said adsorbent medium comprises Fullers earth. 12. A process as defined in Claim 1 wherein said contacting comprises contacting in a slurry or in a percolating apparatus. 13. A process as defined in Claim 1 wherein said unsaturated hydrocarbon comprises terminal olefinic groups. 14. A biodegradable dielectric composition comprising an unsaturated hydrocarbon having at least about 50% olefinic groups, substantially free of polar contaminants and an antioxidant. 15. A composition as defined in Claim 14 wherein said antioxidant comprises a hindered phenolic compound. 16. A composition as defined in Claim 14 wherein said saturated hydrocarbon is selected from the group of a technical white oil, a saturated polyalphaolefin, and mixtures thereof. 17. A composition as defined in Claim 16 wherein said composition has a pour point of less than about -15 degree C. 18. A composition as defined in Claim 16 wherein said composition has a dielectric strength of greater than about 35 Kv, a dissipation loss of less than about 0.08 at 25 degree C and less than about 0.25% at 100 degree C, and a viscosity of less than about 15 cSt at 40 degree C. 19. A composition as defined in Claim 14 prepared by the process as defined in Claims 1 to 13. 20. An electrical apparatus employing an insulating oil wherein said insulating oil comprises an unsaturated hydrocarbon substantially free of polar contaminants. An electrical apparatus employing an insulating oil wherein said insulating oil comprises an unsaturated hydrocarbon substantially free of polar contaminants.