Process for refining used oils and conversion of acid-sludge...

C - Chemistry – Metallurgy – 10 – G

Patent

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C10G 17/00 (2006.01) C10C 3/02 (2006.01) C10G 31/06 (2006.01) C10M 175/00 (2006.01)

Patent

CA 2116084

A process for significantly decreasing the acid sludge settling time in waste oil recovery processes comprising the steps of heating used oil to a high temperature above 725 degrees Fahrenheit, cooling the heated oil, adding an oxidizing agent to the oil, allowing the acid sludge to settle within a period of approximately 24 to 72 hours, separating the acid-sludge-free oil from the acid sludge which settles out of solution as a result of addition of the oxidizing agent, and adding a polishing agent and separating the re-refined oil from the spent polishing agent. The spent polishing agent is recycled, and the acid sludge which settles out after oxidation is converted to either hard, oxidized asphalt or soft asphalt or asphalt products such as emulsions etc. The process produces a high quality re-refined oil rapidly and economically with no acid sludge disposal problem.

Méthode pour réduire de façon significative le temps de décantation des boues acides dans les procédés de récupération d'huiles résiduelles, comprenant les étapes suivantes : chauffer l'huile usée à une température élevée, soit plus de 725 degrés Fahrenheit; refroidir l'huile; ajouter à celle-ci un agent oxydant; laisser décanter la boue acide pendant une période d'environ 24 à 72 heures; séparer l'huile de la boue acide qui s'est déposée après l'addition de l'agent oxydant; ajouter un agent de polissage et séparer l'huile régénérée de l'agent de polissage usé. L'agent de polissage usé est recyclé, et la boue acide qui s'est déposée après oxydation est convertie soit en asphalte oxydé dur, soit en asphalte mou ou en produits asphaltiques, comme des émulsions, etc. Le procédé donne rapidement et économiquement une huile régénérée, sans aucun problème d'élimination de boues acides.

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