Abrégé

There is provided a method and a system for purifying used oil. The method comprises passing a feed containing used oil through an organophilic nanofiltration membrane thereby allowing molecules having molecular weight lower than 1,000g/mol present in the used oil to filter through, and polishing the filtered used oil to remove colouring of the used oil to thereby obtain purified used oil. High molecular weight impurities are separated from the used oil with the use of nanofiltration membrane technology. Transmembrane pressure is applied across the membrane to allow the separation. With this method, the impurities content is greatly reduced in the permeate.

Classes IPC  ?

• C10M 175/06 - Traitement des lubrifiants usés pour récupérer les produits utiles par ultrafiltration ou par osmose
• B01D 61/14 - UltrafiltrationMicrofiltration
• C10G 31/09 - Raffinage des huiles d'hydrocarbures, en l'absence d'hydrogène, par des méthodes non prévues ailleurs par filtration