Alkaline treatment method for refining used oils

C - Chemistry – Metallurgy – 10 – M

Patent

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C10M 175/00 (2006.01) C10M 175/02 (2006.01)

Patent

CA 2222704

An alkaline treatment method for refining used oils, wherein (a) the used oils are distilled; (b) the resulting distillate is treated with an alkaline agent in the presence of a solvent selected from water, a monoalcohol, a polyalcohol and a mixture of said alcohols, said alkaline agent being present in a percentage by weight, based on the weight of the distillate, equal to the product F x (IA + IS), where F is a multiplier between 2 and 50 and IA and IS are the acid value and the saponification value respectively of said distillate, at a temperature of around 80-330 ·C for 2-200 minutes; (c) the reaction medium is washed with water then decanted to recover the oily phase; and (d) said oily phase is distilled. The method is useful for producing refined oils having excellent properties in that they are odourless and nearly colourless and in that they have a very low chlorine, phosphorus and silicon content.

Ce procédé comprend les étapes consistant: a) à procéder à une distillation desdites huiles usagées, b) à traiter le distillat résultant avec un agent alcalin et en présence d'un solvant choisi parmi l'eau, un monoalcool, un polyalcool et un mélange de ces alcools, ledit agent alcalin étant présent en une proportion, en pourcentage en poids par rapport au poids du distillat, égale au produit F x (IA+IS), F étant un facteur multiplicateur compris entre 2 et 50, IA et IS étant respectivement l'indice d'acide et l'indice de saponification dudit distillat, ledit traitement étant effectué à une température d'environ 80 à 330 ~C pendant un temps d'environ 2 à 200 mn, c) à laver à l'eau le milieu réactionnel puis à laisser décanter pour récupérer la phase huileuse, et d) à procéder à la distillation de ladite phase huileuse. Ce procédé permet d'obtenir des huiles raffinées présentant d'excellentes propriétés et en particulier une absence d'odeur, une faible coloration et de très faibles teneurs en chlore, phosphore et silicium.

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