METHOD FOR REGENERATION OF EXHAUSTED WATER-EMULSION LUBRICATION FLUID Russian patent published in 2002 - IPC

FIELD: lubrication fluid. SUBSTANCE: invention relates to reusing wastes in the form of slimes originating from metallurgical and mechanical engineering enterprises, in particular regenerating their water phase in the form of clarified emulsion remaining after primary oil recovery. Exhausted lubrication fluid is first settled to separate clarified emulsion from oil. pH value of emulsion is adjusted to 5.6-8.0 at heating to 70-100 C accompanied by turbulent stirring, after which emulsion is treated with aluminum chloride aqueous solution taken in specified amount and then with complete specified amount of solution of cationic flocculant: product of polymerization of dimethyldiallylammonium chloride with molecular weight 536000-600000. Introduction time for polymerization product is determined visually after registration of first pulsations on the surface of clarified emulsion caused by agitation. In the third step, anionic flocculant is also added in the form of 0.3-1% aqueous solution of polyacrylamide hydrolyzed in alkaline medium (molecular weight 500000-600000) and containing 10% of acid units of formula -CH₂-CH(COONa)- and 90% of amide units of formula CH₂CH(CONH₂)-. Time gap between additions of the above-mentioned polymerization product and anionic flocculant is specified to be 40-60 min in absence of stirring. After addition of anionic flocculant, turbulent stirring is resumed for 1-3 min and degree of turbulization is strongly weakened until pulsations on the surface of emulsion are no longer visible and then emulsion is stabilized to terminate third step and settled for 60-70 min. Oil is once more recovered and, to separated emulsion, calcium oxide is added to reach pH 8.5 by reaction lasting during 40-60 min, after which emulsion is settled. Weight ratio of clarified emulsion to aluminum chloride, cationic flocculant, anionic flocculant, calcium oxide, and water is 1000000: (300-400): (25-50): (5-10): (500- 600): (15-20), respectively. EFFECT: increased efficiency of removal of petroleum derivatives, phosphate and ammonium ions from water phase. 4 cl, 2 tbl, 10 ex