C - Chemistry – Metallurgy – 10 – G
Patent
C - Chemistry, Metallurgy
10
G
196/264
C10G 21/12 (2006.01)
Patent
CA 1289098
ABSTRACT OF THE DISCLOSURE Hydrocarbon oils, particularly petroleum oils, more particularly lube, transformer, white oil and other specialty oils can be extracted to remove aromatic hydrocarbon components therefrom using a combi- nation polar extraction solvent, such as n-methyl pyr- rolidone phenol or furfural, preferably NMP in combina- tion with aliphatic-aromatics, polar naphthenes or morpholine, preferably alkylbenzene, mixed extraction solvent. The combination of polar extraction solvent and aliphatic-aromatic, polar naphthene or morpholine extraction solvent mixture contains and from 1 to up to but not including 10 LV% aliphatic-aromatic, polar naphthene or morpholine and mixtures thereof, prefer- ably from 2.5 to less than 10% aliphatic-aromatic, polar naphthene or morpholine and from 0 to 10 LV% water, the amount of polar extraction solvent being suitably adjusted to reflect the presence of the water. Extraction using the combination solvent is conducted at a temperature above the haze point of the oil being extracted but at a tower bottoms temperature at least 30°C, and preferably 40°C, or more below the critical solution temperature of the feed-solvent mixture.
525601
Bell James D.
Borden Ladner Gervais Llp
Exxon Research And Engineering Company
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