METHOD OF PURIFYING ANTIFREEZE BASED ON WATER-ETHYLENE GLYCOL SOLUTION TO REMOVE ETHYLENE GLYCOL OXIDATION PRODUCTS, CORROSION PRODUCTS, AND SUSPENDED IMPURITIES Russian patent published in 2004 - IPC

FIELD: special-destination fluids. SUBSTANCE: invention resides in adding in adding coagulant followed by separation of centrifuge and clarification on activated carbon, said coagulant being composed of alkali metal hydroxide, 75% orthophosphoric acid, and sodium polyphosphate and added in amounts providing mixture containing, wt %: sodium or potassium hydroxide 0.01-1.0, 75% orthophosphoric acid 0.02-1.6, sodium polyphosphate 0.01-1.5, glycols 40.0-90.0, water and oxidation and corrosion products - the balance. EFFECT: improved quality of purification and reduced power consumption. 3 tbl, 3 ex