METHOD FOR WASTE MINERAL MOTOR OILS PURIFICATION Russian patent published in 2017 - IPC C10M175/02 

FIELD: chemistry.

SUBSTANCE: purification of waste mineral motor oil using monoethanolamine, orthophosphoric acid as coagulants and isopropyl alcohol, methyl ethyl ketone as solvents, purification is carried out in two stages, the first stage includes introduction of 1 vol. % of monoethanolamine and 1 vol. % of isopropyl alcohol into the waste oil, followed by heating to 110°C and centrifugation, and the second stage includes introduction of 1 vol. % of monoethanolamine and 1 vol. % of a reagent, consisting of 94% isopropyl alcohol, 3% phosphoric acid and 3% methyl ethyl ketone, into the purified oil, and the mixture is heated to 120°C and centrifuged.

EFFECT: application of the proposed method for waste mineral motor oil purification allows to completely remove insoluble impurities, oxidation products, resins due to two-stage purification, the refined oil has a high degree of clarification.

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