Patent ID: 11873463
Assignee: REGEN III CORP.
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A method comprising:
contacting a feedstock comprising purified used oil with an extraction solvent to perform continuous liquid-liquid solvent extraction, to produce an extract stream comprising the extraction solvent and an extract dissolved in the extraction solvent, wherein the feedstock and the extraction solvent form countercurrents in a solvent extraction column and are agitated by a variable speed agitator during the solvent extraction at a selected agitation speed, the agitation speed and the flow rates of the feedstock and extraction solvent into the solvent extraction column being adjusted independently based on a quality or property of the feedstock;
separating the extract from the extraction solvent; and
subjecting the extract to a continuous flow liquid phase hydrogenation treatment to produce an oil product having a viscosity index of at least 80.