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US 4,175,278 AGranted
Electric insulating oil compositions
AssigneeNippon Petrochemicals Company, Limited
InventorsAtsushi Sato, Isoo Shimizu, Eiichi Matsuzaka
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AssigneeNippon Petrochemicals Company, Limited
InventorsAtsushi Sato, Isoo Shimizu, Eiichi Matsuzaka
Estimating the term…
The present invention provides novel electric insulating oil compositions and a process for preparing the same. The electric insulating compositions of the invention comprise distillates within a boiling range in terms of normal pressure between 265.degree. C. and 360.degree. C. obtained by processing a hydrocarbon mixture from cracking of petroleum hydrocarbons at a temperature of 700.degree. C. or higher principally composed of components with a boiling range between 75.degree. C. and 198.degree. C., said components mainly containing monocyclic aromatics and comprising aromatic olefins of said boiling range, in liquid phase in the presence of an acid catalyst under such conditions that the reaction temperature is from 0.degree. C. to 200.degree. C., the liquid residence time is from 0.1 hour to 5 hours and the concentration of aromatic olefins in the reaction system is 10% by weight or below.
Electric insulating oil compositions comprising distillates within a boiling range in terms of normal pressure between 265.degree. C. and 360.degree. C. obtained by processing a hydrocarbon mixture from cracking of petroleum hydrocarbons at a temperature of 700.degree. C. or higher principally composed of components with a boiling range between 75.degree. C. and 198.degree. C., said components consisting essentially of monocyclic aromatics and comprising aromatic olefins of said boiling range in liquid phase in the presence of an acid catalyst uder such conditions that the reaction temperature is from 0.degree. C. to 200.degree. C., the liquid residence time is from 0.1 hour to 5 hours and the concentration of aromatic olefins initially in the reaction system is 10% by weight or below.
Dependencies are inferred from the claim text.