Mineral oils: processes and products – Fractionation – Liquid extraction with solvents
Reexamination Certificate
2005-03-15
2005-03-15
Griffin, Walter D. (Department: 1764)
Mineral oils: processes and products
Fractionation
Liquid extraction with solvents
C208S311000, C208S322000, C208S323000, C208S326000, C585S860000, C585S864000
Reexamination Certificate
active
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.
Irudayaraj Devotta
Kumar Bhatnagar Akhilesh
Mani Bhaskar
Phoobalan Venketesan
Selai Raman Naduhatty
Griffin Walter D.
Indian Oil Corporation Limited
Nguyen Tam M.
RatnerPrestia
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