PROCEDE ET INSTALLATION DE REGENERATION D'HUILES LUBRIFIANTES A HAUTES PERFORMANCES

LA PRESENTE INVENTION CONCERNE UN PROCEDE ET UNE INSTALLATION DE REGENERATION D'HUILES LUBRIFIANTES USAGEES AYANT UNE FAIBLE TENEUR EN FUEL, ACIDES GRAS ET PRODUITS CHLORES. LES HUILES LUBRIFIANTES USAGEES SONT SOUMISES AUX ETAPES SUCCESSIVES DANS L'ORDRE : ADJONCTION DE BASES FORTES EN SOLUTION AQUEUSE A RAISON DE 05 A 3% DE BASES PURES EN MASSE D'HUILES USAGEES, DESHYDRATATION ET EXTRACTION DES HYDROCARBURES LEGERS, EXTRACTION ET RECUPERATION DE GASOIL (STRIPPING) EXTRACTION DES IMPURETES. SELON L'INVENTION, UNE ADJONCTION COMPLEMENTAIRE D'UNE BASE FORTE EN SOLUTION AQUEUSE EN RAISON DE 0,1 A 1% DE BASE PURES EN MASSE D'HUILES USAGEES EST REALISEE POSTERIEUREMENT A L'ETAPE DE DESHYDRATATION ET EXTRACTION DES HYDROCARBURES LEGERS. LES HUILES LUBRIFIANTES USAGEES AINSI TRAITEES SONT DEBRRASSEES DE LEURS IMPURETES PAR DISTILLATION The invention concerns a method and a plant for regenerating lubricating waste oil with low content of fuel, fatty acids and chloric products. The lubricating waste oil is subjected to the following steps successively: adding strong bases in aqueous solution at the rate of 0.5 to 3 % of pure bases by mass of waste oil; dehydrating and extracting the light hydrocarbons, extracting and recuperating the gas oil (stripping); extracting the impurities. The invention is characterised in that a complementary addition of a strong base in aqueous solution at the rate of 0.1 to 1 % by mass of waste oil is carried out following the dehydrating and extracting of light hydrocarbons. The treated lubricating waste oil are rid of their impurities by distillation.