Patent ID: 6479439
Filing Date: 2002-11-12
Classification: B01D,C10M

Abstract:
A method for the regeneration of acidic, organic lubricant stripped during a cold forming process from reaction lubricant residues containing polyvalent metal ions and phosphate ions, said method comprising passing said residues through the following steps:a) adding to said residues a component selected from phosphoric acid, phosphoric acid esters, and both phosphoric acid and phosphoric acid esters, to said residue to precipitate metal cations; b) adding water to dissolve water-soluble impurities; c) separating a lubricant component from said solid and aqueous phases, which phases are incompatible with said lubricant component; and d) adding acidic phosphoric acid ester to the remaining lubricant phase to adjust the free acid to a value of at least 10 points and to adjust total acidity point number to at least 70, with the adjustment of the ratio of free acid to total acidity being in the range of 0.1 to 0.5.