Method for producing electrical insulating oil composition
AssigneeNippon Petrochemicals Company, Limited
InventorsShigenobu Kawakami, Keiji Endo, Hideyuki Dohi, Atsushi Sato
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Abstract
A method for producing an electrical insulating oil composition composed of benzyltoluene and ditolymethane. The composition is excellent in low-temperature characteristics and contains substantially no chlorine. The method comprises the steps of reacting monocyclic aromatic hydrocarbon with diarylmethane which has been prepared without using a chlorinated hydrocarbon as a starting material, at a temperature of -10.degree. to 550.degree. C. in the presence of a disperoportionation catalyst to prepare a reaction product containing benzyltoluene and ditolylmethane, and recovering benzyltoluene and ditolylmethane from said reaction product by distillation.
Claims8
A method for producing an electrical insulating oil composition consisting essentially of 20 to 80% of benzyltoluene and 80 to 20% of ditolylmethane, said method comprising the steps of reacting a monocyclic aromatic hydrocarbon represented by the following general formula (I) with a diarylmethane represented by the following general formula (II) which has been prepared without using a chlorinated hydrocarbon as a starting material, at a temperature of -10.degree. to 550.degree. C. in the presence of a disproportionation catalyst to prepare a reaction product containing benzyltoluene and ditolylmethane, and recovering benzyltoluene and ditolylmethane from said reaction product by distillation:
- ##STR2## wherein each of R.sub.1 to R.sub.3 is a hydrogen atom or a methyl group, but when R.sub.1 is the hydrogen atom, the total number of carbon atoms of R.sub.2 and R.sub.3 is 2, and when R.sub.1 is the methyl group, the total number of carbon atoms of R.sub.2 and R.sub.3 is 0 or 1.
Dependencies are inferred from the claim text.