Process for producing uninhibited transformer oil

Details Process for producing uninhibited transformer oil Process for producing uninhibited transformer oil

1974-09-11

1976-01-13

Levine, Herbert

Mineral oils: processes and products

Chemical conversion of hydrocarbons

With preliminary treatment of feed

208 14, 208254H, 208264, C10G 3400

Patent

active

039322670

ABSTRACT:
A method for producing uninhibited transformer oil is disclosed which includes isolating a petroleum distillate that is primarily naphthenic and aromatic in character, boiling above 400.degree.F, having a viscosity between 50 and 100 SSU at 100.degree.F, and containing sulfur compounds; contacting the distillate with a solvent selective for aromatic hydrocarbons under conditions to produce a raffinate phase containing 15-30%v aromatic hydrocarbons; hydrotreating the raffinate phase to reduce the nitrogen content to at most 25 PPM, to maintain the sulfur content greater than 0.08%w, and to maintain the aromatic hydrocarbon content greater than 15%v. The product is an uninhibited transformer oil, and it can be further improved by regenerative clay treatment and by the addition of certain aromatic hydrocarbon compounds containing two or more six carbon membered fused or unfused rings, at least one of which is a benzene ring.

REFERENCES:
patent: 2846372 (1958-08-01), Schneider et al.
patent: 2865839 (1958-12-01), Halter et al.
patent: 3196102 (1965-07-01), Mills et al.
patent: 3406111 (1968-10-01), Wynkoop et al.
patent: 3551324 (1970-12-01), Lillard
patent: 3732154 (1973-05-01), Mills et al.
patent: 3839188 (1974-10-01), Mills et al.

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