Dual solvent refining process

Details Dual solvent refining process Dual solvent refining process

1980-07-17

1982-04-20

Gantz, Delbert E.

Mineral oils: processes and products

Fractionation

Liquid extraction with solvents

C10G 2120

Patent

active

043258182

ABSTRACT:
A dual solvent refining process for solvent refining petroleum based lubricating oil stocks with N-methyl-2-pyrrolidone as selective solvent for aromatic oils wherein a highly paraffinic oil having a narrow boiling range approximating the boiling point of N-methyl-2-pyrrolidone is employed as a backwash solvent. The process of the invention results in an increased yield of refined lubricating oil stock of a predetermined quality and simplifies separation of the solvents from the extract and raffinate oil fractions.

REFERENCES:
patent: 3239456 (1966-03-01), Woodle et al.
patent: 3249532 (1966-05-01), Shiah
patent: 3317423 (1967-05-01), Hebert
patent: 3461066 (1969-08-01), Morris et al.
patent: 3725254 (1973-04-01), Wang
patent: 4057491 (1977-11-01), Bushnell et al.

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