Method of rerefining waste oil by distillation and extraction

Details Method of rerefining waste oil by distillation and extraction Method of rerefining waste oil by distillation and extraction

C - Chemistry, Metallurgy

10

M

C10M 175/00 (2006.01)

Patent

CA 2302270

A process for recovering a base oil of lubricating viscosity from used oil in which, following optional pretreatment, used oil is re-refined by distilling it in distillation apparatus having multiple theoretical plates. Impurities are then extracted from the lube range distillate fraction or fractions with a liquid extractant such as N-Methyl-2- Pyrrolidone (NMP) at a temperature below the temperature, if any, of complete miscibility of the extractant and the oil. The oil and extractant are then separated whereupon the extractant is re-used in the process and the oil is subject to further treatment, as necessary, for targeted uses.

Divulgation d'un procédé de récupération d'huile de base à viscosité lubrifiante dans des huiles usées pour lequel, après un pré-traitement éventuel, on raffine à nouveau les huiles usées dans un appareil de distillation ayant plusieurs plaques théoriques. Les impuretés sont ensuite extraites de la ou les fractions de distillat de la gamme de lubrification à l'aide d'un agent d'extraction liquide, comme du N-méthylpyrrolid-2-one (NMP), à une température inférieure, si elle existe, à la température de miscibilité complète de l'agent d'extraction et de l'huile. L'huile et l'agent d'extraction sont ensuite séparés, l'agent d'extraction étant réutilisé pour le procédé et l'huile étant soumise à un autre traitement, si nécessaire, selon les usages prévus.

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