Method for reprocessing waste oils, base oils obtained according to said method and use thereof

摘要

The invention relates to a method for reprocessing waste oils and producing base oils, whereby waste oils is treated by means of distillation, thin-film evaporation and high vacuum, optional fractionation for separation into layers of different viscosities and subsequent extraction with N-methyl-2-pyrrolidone and/or N-formylmorpholine. The invention also relates to base oils that can be obtained by said method and to use thereof. The method is characterised in that approximately any waste oil can be used, including waste oil with polychlorinated biphenylene (PCB) or PCG substitutes with contents of up to 250 mg/kg. Furthermore, waste oils containing up to 5 % vegetable oil can be present in the waste oil that is to be reprocessed without impairing the quality of the base oil.