Thermal treatment of used petroleum oils

Details Thermal treatment of used petroleum oils Thermal treatment of used petroleum oils

C - Chemistry, Metallurgy

10

M

196/205

C10M 175/00 (2006.01)

Patent

CA 1079215

Abstract of the Disclosure Used oil, such as automotive crankcase oil drainings from internal combustion engines, are pretreated by heating to above about 400-800°F, and preferably between 600-750°F, while an essentially liquid phase system is maintained at a pressure of between 500-3500 p.s.i.g., preferably between 2000-3500 p.s.i.g., for between 15-60 minutes, the contact time being even shorter at higher temperatures. A sludge which contains contaminants, such as insoluble degradation products, metallic compounds, and water, is separated preferably by centrifuga- tion, leaving a substantially ashless oil ready for additional refinement to a high quality lubricating oil, or it may be used, per se, as a fuel oil. -1-

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