Extraction of aromatics from hydrocarbon oil using...

Mineral oils: processes and products – Fractionation – Liquid extraction with solvents

Reexamination Certificate

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Details

C208S311000, C208S322000, C208S323000, C208S326000, C585S860000, C585S864000

Reexamination Certificate

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06866772

ABSTRACT:
An improved furfural extraction process for lube oil base-stock production from hydrocarbon oils containing aromatic type material by the addition of a solvent comprising of furfural and a co-solvent, said process being conducted in a continuous countercurrent extraction column that facilitates phase separation and increases the raffinate yield while maintaining the same raffinate quality measured by raffinate refractive index.

REFERENCES:
patent: 3929617 (1975-12-01), Henry et al.

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