Solvent extraction process

Details Solvent extraction process Solvent extraction process

1980-02-27

1982-01-19

Gantz, Delbert E.

Mineral oils: processes and products

Fractionation

Liquid extraction with solvents

208326, C10G 2120

Patent

active

043115837

ABSTRACT:
A solvent refining process utilizing N-methyl-2-pyrrolidone as solvent in which primary extract from the extraction zone is cooled to form a secondary raffinate and secondary extract and the secondary and primary raffinates are blended to produce an increased yield of product of desired quality. In a preferred embodiment of the process, the lubricating oil feedstock to the process is first contacted with a stripping medium previously used in the process for the recovery of solvent from at least one of the product streams whereby solvent contained in said stripping medium is recovered therefrom.

REFERENCES:
patent: 2106234 (1938-01-01), Bray
patent: 2846354 (1958-08-01), Holm et al.
patent: 2886523 (1959-05-01), Claridge et al.
patent: 3306849 (1967-02-01), Bozeman et al.
patent: 3476681 (1969-11-01), Davies et al.
patent: 4057491 (1977-11-01), Bushnell et al.

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