Triple distillation procedure for the regeneration of used oils including in-line caustic treatment in the second distillation

摘要

The present invention relates to a regeneration process of used lubricating oils consisting of a triple distillation process including a second column of deasphalting and activation of caustic reagent. # The invention is basically characterized by the independent deasphalting phase, which is described in the figure. This deasphalting is carried out in an independent column, obtaining an asphaltic bottom without additive, since the caustic reagent is also added to the deasphalting column, but at a stage immediately after the extraction of the asphaltic background. # The process allows obtaining High quality lubricant bases using low concentrations of caustic reagent and produces a high quality asphalt bottom in the second column, because it does not contain caustic reagent. In this way the production of waste is also very significantly reduced.