Prolonged calcining at 600°to 700°C. may improve the ability of an alumina to remove sulfur compounds from aromafic fractions of mineral oil. Nickelnickel oxide supported on silicaalumina is excellent for removing sulfur compounds from hydrocarbons.

Interrelated Effects of Oil Components on Oxidation StabilityAn oil to be used without an inhibitor such as di-ferf-butyl-pcresol should contain low mononuclear aromatics concentration. Inhibited oils should contain less aromatics than uninhibited oils, but as much as possible of the natural sulfur, as stable sulfur compounds.Nitrogen compounds are deleterious.

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