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1. (WO2001000756) METHOD FOR DECONTAMINATING WASTE SEMI-SYNTHETIC OR SYNTHETIC MINERAL OILS

Pub. No.:    WO/2001/000756    International Application No.:    PCT/FR2000/001705
Publication Date: Fri Jan 05 00:59:59 CET 2001 International Filing Date: Thu Jun 22 01:59:59 CEST 2000
IPC: C10M 175/00
Applicants: DEUTSCH, Richard
Inventors: DEUTSCH, Richard
Title: METHOD FOR DECONTAMINATING WASTE SEMI-SYNTHETIC OR SYNTHETIC MINERAL OILS
Abstract:
The invention concerns a method for decontaminating waste lubricating oils which consists in: a) pouring the oils to be treated in a container, adding thereto 1-2 wt. % of glycol, heating at 60 °C, stirring and allowing to cool and decanting; b) drawing the aqueous phase, adding to the oily phase a chelating agent, in sodium solution with a pH ∫ 7, preferably pH 6, bringing to 60-80 °C, stirring for at least one hour, then centrifuging; c) adding to the oily phase a coagulating agent; d) adding to the oily phase barium hydroxide in water to precipitate the sulphate and phosphate ions in the form of barium sulphate and phosphate which is separated; e) performing a fractionated distillation to recuperate the basic constituents of the oils, and optionally carrying out a discoloration of the resulting products.