Title: Recent Methods Available for Re-Refining of Lubricating Oil: A Review
Abstract: Re-refining is the method for recovering a vital resource of mineral base oil, being as good as or better than the original base oil. During normal use, impurities such as dirt, metal scrapings, water or chemicals can get mixed in the oil or be generated due to oxidation. Therefore quality of such oil gradually decreases. Disposing the used oil directly creates dangerous/harmful effects. Re-refining with various processes done in order to overcome with such problems acid/clay treatment, vacuum distillation/clay treatment and solvent extraction/clay treatment done. This processes enhance the viscosity of used oil.