Investigation of the possibility of using coagulant for cleaning used motor oils

Abstract

The article is devoted to studying the possibility of using organic or inorganic coagulants in the process of purification of used motor oils (UMO). In experimental studies, combinations of aqueous solution of carbomide, acetic acid and isopropyl alcohol were used as coagulants. The analysis showed that the third variant of coagulant combination was the most effective. Mathematical models were obtained. Varying factors: percentage of coagulant α (%), settling temperature t (°C) and settling time τ (min−1). The mathematical model is constructed for response functions: alkaline pH number, oil color (OC) of mechanical impurities content (β). The research results showed that this coagulant improves the color of used oil. The use of this coagulant increases the alkaline number of purified oil. It reduces the content of mechanical impurities.