Refining highly aromatic lube oil stocks

Details Refining highly aromatic lube oil stocks Refining highly aromatic lube oil stocks

C - Chemistry, Metallurgy

10

G

196/262

C10G 21/20 (2006.01) C10G 21/00 (2006.01) C10G 21/28 (2006.01)

Patent

CA 1164391

Abstract: A process for solvent extraction of higher aromatic hydrocarbon oils with N-methyl-2-pyrrolidone wherein N-methyl-2-pyrrolidone is separated from a solvent- extract mix in a series of distillation steps with re- circulation of a portion of a partially stripped extract mix from an intermediate distillation step to the ex- traction step to improve the solvent-oil ratio in the extraction step and conserve energy as compared with conventional processes in which the solvent power of N-methyl-2-pyrrolidone is moderated by incorporating water in the solvent.

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