Title:
INSULATING OIL AND MANUFACTURE THEREOF
Document Type and Number:
Japanese Patent JP2649474
Kind Code:
B2
Abstract:
PURPOSE: To provide insulating oil superior to oxidation stability, retarding capability of tanδ max, and hydrogen gas absorbency, and to provide its manufacture.
CONSTITUTION: The first purified mineral oil whose total nitrogen component Nt is 15ppm or less, sulfide type sulfur Sf is 10ppm or less, and titralin and/or indane family aromatic hydrocarbon T&I are 10-35wt.% is manufactured by hydrogenation of the first mineral oil fraction. The second purified mineral oil whose total sulfur component St is 0.5-2.0wt.%, and Sf is 0.2-0.9wt.% is manufactured by solvent extraction in a specified condition of the raffinate yield of the second mineral oil fraction. The first purified mineral oil and the second purified mineral oil are mixed in a ratio of 99.5:0.5-91.0:9.0. The mixture is treated with a solid adsorbent after no long-chain alkylbenzene or after mixing a specified amount of long-chain alkylbenzene to obtain insulating oil whose basic nitrogen Nb is 1ppm or less, non-basic nitrogen Nn is 15ppm or less, Sf is 50-150ppm, and T&I are 10-35wt.%.
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Inventors:
MATSUNAGA MITSUFUMI
Application Number:
JP11761593A
Publication Date:
September 03, 1997
Filing Date:
April 22, 1993
Export Citation:
Assignee:
JAPAN ENAJII KK
International Classes:
C10G67/04; C10G67/06; C10M111/02; H01B3/20; C10N40/16; (IPC1-7): H01B3/20; C10G67/04; C10G67/06; C10M111/02
Attorney, Agent or Firm:
Maruyama Eiichi
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