EP 1190023 A1 20020327 - METHOD FOR DECONTAMINATING WASTE SEMI-SYNTHETIC OR SYNTHETIC MINERAL OILS
Title (en)
METHOD FOR DECONTAMINATING WASTE SEMI-SYNTHETIC OR SYNTHETIC MINERAL OILS
Title (de)
VERFAHREN ZUR DEKONTAMINIERUNG VON MINERAL-, HALBSYNTHETISCHEN-, UND SYNTHETISCHEN ÖLEN
Title (fr)
PROCEDE DE DECONTAMINATION DES HUILES MINERALES SEMI-SYNTHETIQUES ET SYNTHETIQUES USAGEES
Publication
Application
Priority
- FR 0001705 W 20000621
- FR 9908021 A 19990623
Abstract (en)
[origin: FR2795421A1] The stages of treatment of the contaminated oil enables operation of the fractional distillation stage at a lower temperature and avoids the cracking of any polymers present. The decontamination of waste lubricating oils comprising mineral oils, semi-synthetic and synthetic oils comprises: (a) the addition of 1-2 wt.% glycol to the oil in a container, heating to 60 deg C, stirring then cooling and separating to obtain an aqueous phase containing glycol and phenolic products, suspended material, silicone oil residues and anti-foam agents; (b) withdrawal of the aqueous phase and addition of a chelating agent to the oily phase in stoichiometric amount, or above, relative to the compounds to eliminate, in a soda solution at pH not exceeding 7 (preferably 6) at 60-80 deg C, with stirring for 1 hour, and centrifugation to separate off the oily phase from the solution containing chelated heavy metals; (c) the stoichiometric addition of a coagulant to the oily phase to separate iron, and separation of the aqueous phase obtained; (d) the stoichiometric addition of barium hydroxide to the oily phase in suspension or solution to precipitate sulfate and phosphate ions as barium phosphate and sulfate and separation by centrifugation; and (e) fractional distillation to recover the base constituents of the oils, and optionally decoloration of the products obtained.
IPC 1-7
IPC 8 full level
C10M 175/00 (2006.01)
CPC (source: EP)
C10M 175/0075 (2013.01)
Citation (search report)
See references of WO 0100756A1
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
FR 2795421 A1 20001229; FR 2795421 B1 20011005; AU 6450200 A 20010131; EP 1190023 A1 20020327; WO 0100756 A1 20010104
DOCDB simple family (application)
FR 9908021 A 19990623; AU 6450200 A 20000621; EP 00951623 A 20000621; FR 0001705 W 20000621