Thermal treatment of used petroleum oils

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

1975-04-24

1977-07-05

Gantz, Delbert E.

Mineral oils: processes and products

Refining

Purifying used oil

C10M 1100

Patent

active

040338592

ABSTRACT:
Used oil, such as automotive crankcase oil drainings from internal combustion engines, are pretreated by heating to above about 400.degree.-800.degree. F, and preferably between 600.degree.-750.degree. 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 centrifugation, 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.

REFERENCES:
patent: 1778831 (1930-10-01), Jones
patent: 3923643 (1975-12-01), Lewis et al.
patent: 3954602 (1976-05-01), Troesch et al.
patent: 3990963 (1976-11-01), Audibert et al.

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