Mineral oils: processes and products – Refining – Metal contaminant removal
Reexamination Certificate
2004-09-23
2008-10-07
Nguyen, Tam M. (Department: 1797)
Mineral oils: processes and products
Refining
Metal contaminant removal
C208S252000, C208S253000, C208S255000
Reexamination Certificate
active
07431829
ABSTRACT:
The present invention refers to a method for the regeneration of used petroleum oils which comprises the following steps:(a) demetallization of the used mineral oil by means of chemical treatment of said oil with an aqueous solution of a chemical reagent containing anions which form low solubility salts with the metals of the oil, followed by the separation of the demetallized oil;(b) distillation of the demetallized oil obtained in step (a) at atmospheric pressure and in the presence of alkaline hydroxides; and(c) distillation of the bottom liquid obtained in the atmospheric distillation in step (b) under vacuum and in the presence of alkaline hydroxides to obtain lubricant bases.
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Katten Muchin & Rosenman LLP
Nguyen Tam M.
Sener Grupo De Ingenieria, S.A.
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