Method for the preparation of insulating oil

Details Method for the preparation of insulating oil Method for the preparation of insulating oil

1975-04-30

1977-02-15

Crasanakis, George

Mineral oils: processes and products

Refining

Sulfur removal

208212, 208213, 208216, 208217, C10G 3400

Patent

active

040081486

ABSTRACT:
This invention provides a method for the preparation of insulating oil having good oxidation stability, electric characteristics and resistance to copper corrosion which comprises subjecting a distillate (stock) within a temperature range from 250.degree. to 400.degree. C. in terms of the boiling point at atmospheric pressure to solvent refining to a desulfurization from 30 to 75% by weight to give a raffinate, said distillate having been obtained either by distillation at atmospheric pressure of a paraffin- or mixture-base crude oil and/or by distillation under reduced pressure of a residual oil from the atmospheric pressure distillation, subjecting said raffinate to hydrogenating refining to a desulfurization from 40 to 90% by weight and subjecting the refined product to solvent dewaxing, and if necessary, subsequently subjecting the dewaxed product to clay treatment to a sulfur content of the final product from 0.1 to 0.35% by weight.

REFERENCES:
patent: 2967144 (1961-01-01), Cole
patent: 3520796 (1970-07-01), Murphy, Jr. et al.
patent: 3627673 (1971-12-01), Sproule et al.
patent: 3849288 (1974-11-01), Milstein et al.

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