Method for deodorizing regenerated lubricating oils using supercritical co2

Abstract

The present invention relates to a process of deodorization of a at least partly regenerated lubricating oil, said process comprising the steps of: fractionating the at least partly regenerated lubricating oil in a countercurrent fractional distillation column with a countercurrent flow of supercritical carbon dioxide (sCO2), wherein said oil and supercritical CO2 are fed in the countercurrent column with a ratio of the sCO2 flow rate on oil flow rate ranging from 15 to 50; and recovering the deodorized lubricating oil which is freed of the bad smelling fraction, said bad smelling fraction being extracted within the supercritical CO2. It further relates to a process for preparing a lubricant composition from a deodorized base oil obtained according to the invention.

Dependencies are inferred from the claim text.