ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Physicochemical study of petroleum fractions. IV. Electric properties of hydrocarbons from domestic crude oils

V. Pallo and J. Prokeš

Forschungsinstitut für Kabel und Isolierstoffe in Bratislava

Abstract: The elec. properties (loss angle, tan δ, dielec. const., and elec. resistance) of insulating oils were studied by testing chromatographic fractions of lubricating oil-distillates from Czech crude oils. The value of tan δ increases exponentially with the concn. of aromatic C and it is a function of the amt. of conjugated double bonds. The kinetics of the changes of tan δ at higher temp. in a pure paraffinic-naphthenic (I) sample differ basically from the kinetics of these changes in the sample contg. aromatic components (II). I shows an induction period whereas II shows a sudden increase of tan δ immediately at the start of oxidation. The dependence of tan δ on the dielec. const. is exponential in I; there is practically no relation with the dielec. const. in II.

Full paper in Portable Document Format: 137-8a423.pdf (in Slovak)

Chemical Papers 13 (7-8) 423–429 (1959)