Process for rerefining used oils by solvent extraction

C - Chemistry – Metallurgy – 10 – G

Patent

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Details

C10G 19/02 (2006.01) C10G 7/00 (2006.01) C10G 7/06 (2006.01) C10G 53/04 (2006.01) C10G 53/12 (2006.01) C10G 53/16 (2006.01)

Patent

CA 2492563

The invention relates to a method of regenerating used oils of petroleum origin by means of extraction with aliphatic solvents. The inventive method is characterised in that, once the solvent has been eliminated from the extract, it comprises the following processes: a) flash vaporisation, in a continuous manner in the evaporator at atmospheric pressure or close thereto, in order to separate the light ends in the presence of small quantities of a basic compound or a reducing compound or a mixture of both; b) continuous distillation of the bottom liquid obtained in step a) in a vacuum and at a moderate temperatures in a fractionating column, in the presence of a basic compound or a reducing agent or a mixture of both and involving the recirculation from the bottom of the column to the feed of same. In this way, the vacuum gas oil or spindle oil and the lubricating bases are separated by means of lateral extractions while an asphaltic component or fuel oil is separated at the base.

La présente invention concerne un procédé de régénération d'huiles usées d'origine pétrolifère par extraction, au moyen de dissolvants aliphatiques, se caractérisant en ce que ledit procédé consiste à effectuer, une fois éliminé le dissolvant de l'extrait, les traitement suivants: a) une vaporisation subite ("flash") continue dans un évaporateur, à pression atmosphérique ou presque atmosphérique, pour séparer les fractions légères, en présence de petites quantités d'un composé de base ou d'un composé réducteur, ou d'un mélange de ceux-ci; et b) une distillation continue en colonne de fractionnement du liquide de fond obtenu dans l'étape a), à vide et à températures modérées, en présence d'un composé de base ou d'un agent réducteur, ou d'un mélange des deux, par recirculation de fond de la colonne à l'alimentation de celle-ci, séparant par las extractions latérales le gasoil sous vide ou l'huile spindel et les bases lubrifiantes, et par le fond un fuel ou un composant asphaltique.

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