METHOD FOR REGENERATION OF SPENT OILS BY MEANS OF DEMETALLISATION AND DISTILLATION Russian patent published in 2009 - IPC C10M175/02 

FIELD: technological processes.

SUBSTANCE: invention is related to method for regeneration of spent mineral oils. Substance: method includes the following stages: (a) demetallisation of spent mineral oil by means of its treatment with aqueous solution of ammonium salt containing anions of phosphate and sulfate groups, with further separation of demetallised oil, (b) distillation of demetallised oil produced at the stage (a), at atmospheric pressure and in presence of alkaline hydroxides and (c) distillation of liquid residue produced in process of atmospheric distillation at the stage (b), in vacuum and in presence of alkaline hydroxides with preparation of basic lubrication oils.

EFFECT: improved quality of oils, method simplification, reduction of hard wastes production and contamination of equipment.

13 cl, 1 dwg, 2 ex