Re-refining used lube oil

Details Re-refining used lube oil Re-refining used lube oil

1978-09-28

1979-09-25

Vertiz, O. R.

Mineral oils: processes and products

Refining

Purifying used oil

C10M 1100

Patent

active

041690443

ABSTRACT:
Process for re-refining used lubrication oil by contacting the used lube oil in a first extraction zone with a light hydrocarbon solvent, for example, propane, yielding a first extract and raffinate. The solvent is removed from the first extract to recover desired lubrication stock base. The first raffinate is then solvent-extracted, using the same solvent to produce a second extract and raffinate. The solvent is then removed from this second extract to yield an oil which can be further refined for separation of valuable constituents or burned as fuel oil. The second raffinate is flashed to remove any remaining solvent and leave an easily discardable solid residue.

REFERENCES:
patent: 1766768 (1930-06-01), Werkenthin
patent: 3773658 (1973-11-01), Vu et al.

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