FIELD: oil and fat industry. SUBSTANCE: method involves stirring waste of plant oil manufacture with spent washing liquid obtained at internal combustion engine cleansing. Washing liquid has, wt.-% sodium tripolyphosphate 0.3-0.6; sodium meta-silicate 0.15-0.3; sodium carbonate 0.5-1.0; sodium hydrocarbonate 0.2-0.4; sodium soap of higher fatty acids 0.5-1.0; wetting agent ДБ 0.1-0.2; sodium alkylsulfonate 0.03-0.06, and water the rest. Mass ratio of fat and oil substances and dispersing medium is (0.1-70) and (30-99.9). EFFECT: improved method of dispersing. 1 tbl
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