METHOD OF REGENERATING USED OILS BY MEANS OF EXTRACTION WITH SOLVENTS.

摘要

The invention relates to a method of regenerating used oils of petroleum origin by means of extraction with aliphatic solvents. The inventive method is characterised in that, once the solvent has been eliminated from the extract, it comprises the following processes: a) flash vaporisation, in a continuous manner in the evaporator at atmospheric pressure or close thereto, in order to separate the light ends in the presence of small quantities of a basic compound or a reducing compound or a mixture of both; b) continuous distillation of the bottom liquid obtained in step a) in a vacuum and at a moderate temperatures in a fractionating column, in the presence of a basic compound or a reducing agent or a mixture of both and involving the recirculation from the bottom of the column to the feed of same. In this way, the vacuum gas oil or spindle oil and the lubricating bases are separated by means of lateral extractions while an asphaltic component or fuel oil is separated at the base.