Abstract
: The increase in the generation of used automotive lubricating oils is an issue of growing concern, especially in developing countries. Most used oil contains degraded additives and its indiscriminate disposal causes environmental degradation and pollution. This study investigates the characteristics of the reclaimed oil obtained by solvent extraction technology. It further evaluates the suitability of the reclaimed oil for reuse, by comparing its properties with the Society of Automotive Engineers (SAE) quality standards for lube oils. Three samples of used engine oils were collected, recycled and analyzed. Results from this study and other similar studies indicated that the flashpoint is below the SAE specifications. Viscosity index and kinematic viscosity at 40 and 100 °C are found above the SAE specifications. The pour point of the reclaimed oil is found below the standard values while the specific gravity concurs with the SAE standards. Total acid and total base numbers of the reclaimed oil indicated a low acid concentration. The study suggests an improvement on the flash point and the viscosity of the reclaimed oils for better lubricating performance in the automotive engines.
Highlights
Any petroleum based or synthetic oil that has been used for lubricating purposes and has become unsuitable for its original purpose is known as used oil
The study suggests an improvement on the flash point and the viscosity of the reclaimed oils for better lubricating performance in the automotive engines
The study presents the use of solvent extraction technology for recycling used automotive lubricating oils and examines the suitability of the reclaimed oil for reuse in automotive engines
Summary
Any petroleum based or synthetic oil that has been used for lubricating purposes and has become unsuitable for its original purpose is known as used oil. Used oil is no longer suitable for use consequent upon the loss of its original properties. This loss occurs due to physical contaminants from the air, fuel combustion, oxidation and additives [1], and chemical reactions during its use. The contaminants in used oil include extraneous, sludge, lacquer and oil-soluble products [2]. Extraneous contaminants are introduced from the surrounding air and it includes contaminants from dust, dirt and moisture and by metallic particles from the engine [2]. Metallic particles are introduced from the wear of the engine
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