| 摘要 |
21766-614 The invention provides a method for removing polluting constituents from used oil by heating the used oil to an elevated temperature below 100.degree.C; adding water to the oil; adding sulphuric acid to the oil; thoroughly mixing the oil and the sulphuric acid; allowing the oil-sulphuric acid mixture to react; adding a demulsifier to the oil-sulphuric acid mixture; thoroughly mixing the oil-sulphuric acid-demulsifier mixture; allowing the oil-sulphuric acid-demulsifier mixture to stand in order to allow formation of a water phase containing the pollutants and a purified oil phase; and separating the water phase from the purified oil phase. The sulphuric acid is added to the oil to dissolve heavy metals present in the oil. The dissolved heavy metals will go into the water phase, which water phase is separated from the oil using the demulsifier. After a treatment according to the invention the purified oil may contain less than 0.1% heavy metals and therefore be suitable for combustion or for reuse for refining purposes.
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