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| Binary Solvent Pretreatment, Physio-sorption and Definite Characterization of the Used Engine Lubricant.
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Olabimtan Olabode.H, Benjamin Williams, Mohammed Rihanat.O, Gero Mohammed
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Abstract:
Engine lubricants are viscous petrochemical products that are essentially formulated for the lubrication of moving parts in an engine. With the declining production of fossil oil reserves, the need to recycle used lubricating oils arises more than ever. Coincidentally, engine lubricant loses its properties and cannot be used as required. Hence, this paper comparatively studies the treatment effects of the three months used lubricating oil (5W-30) with a binary solvent mixture [(methanol (70%)/n-hexane (30%)] at a 5:1 solvent to oil mixing ratio with potassium hydroxide as a coagulant at 120oC and solvent expulsion for 30 minutes. The last stage of clarification was achieved with the physical adsorption by analytical grade activated charcoal at 150oC for 1 hour and centrifugation at 300 rpm for 1 hour, resulting in a reddish-transparent colored base oil. Eight selected physicochemical parameters such as pH, specific gravity, dynamic viscosity, ash content, flash point, pour point, percentage water content, and metallic compositions were evaluated with the fresh engine oil (FEO), three-month old engine oil (UEO), and the treated engine oil (TEO). The results obtained at 95% confidence levels with respect to the entire parameters were significantly justified with the treatment methods that generated 95.7% recovery. The approach has been demonstrated to be technically feasible, sustainable and ecologically friendly.
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