抄録
Waste lubricating oils generally contain metallic compound impurities, which result from various additives mixed into fresh lubricating oils and wear grits generated during machine operations. To develop a new refining process of waste lubricating oils into base oil, which includes an effective removal of metallic compounds and other impurities, a speciation analysis for these metallic compounds was conducted. Dialysis and chromatography of waste oil samples were applied to distinguish impurities by physical and chemical forms, such as solid and liquid phases, hydrophobic and hydrophilic molecules. Almost of metallic compounds were found to possibly exist in waste oils as particulates and/or water-soluble salt. However, parts of lead and phosphorous were dissolved in oil content.
