| 摘要 |
<p>Used oils, in particular spent lubricating oils, are coarse filtered and then mixed with an aqueous solution of sodium or potassium silicate and an aqueous solution of polyalkylene glycol at high temperature with stirring. The mixture obtained is allowed to stand, the sediment is separated, and water and light volatiles are separated from the oil phase by distillation. The dried oil phase obtained can be subjected, either directly or by a known treatment with dispersed sodium, to filtration adsorption and then fractionally distilled.</p> |
