Process for regenerating exhausted oils

Details Process for regenerating exhausted oils Process for regenerating exhausted oils

1978-12-18

1980-11-11

Levine, Herbert

Mineral oils: processes and products

Refining

Purifying used oil

208184, C10M 1100

Patent

active

042331404

ABSTRACT:
For refining spent motor oils in order to recover lubricating bases to be reused, the stock to be refined is first stripped of water and light hydrocarbons, then a first extraction with a solvent (preferably a lower paraffin), heating the oil stripped of the solvent, distilling it under vacuum to separate light, medium and heavy lubricating bases, heating the heavier lubricating base and then extracting it with the same solvent as aforesaid, and sending the lubricating bases, separately and individually, to a hydrofinishing stage. The recycle to solvent extraction of the heavy bases affords the advantage of important heat savings and the possibility of adopting blander working conditions in the hydrofinishing of the heavier lubricating bases.

REFERENCES:
patent: 3919076 (1975-11-01), Cutler et al.
patent: 4073719 (1978-02-01), Whisman et al.
Quang et al., "Hydrocarbon Processing", Apr. 1974, pp. 129-131.

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