| 摘要 |
<p>The method is divided into six steps: dehydration, pre-treatment, extraction of glycols and other hydrocarbons, extraction of spindle oil, distillation of light and medium lubricating base oil, and distillation of heavy oil. The distillation steps are carried out using the improved flash column (1) of the invention, including a downward cyclone evaporation pre-chamber (10) having a gradually increasing cross-section, and a cyclone separator (14) at the outlet. The novel design of the reflux-free distillation column allows the use of high vacuum conditions, up to 0.5 mbar, and, consequently, the temperatures of the product to be distilled are substantially lower than with current distillation devices. The absence of reflux and of contact elements inside the column allows the used oil to be pre-treated with a sufficient quantity of a basic solution in order to obtain distilled base oils that require no final treatment.</p> |
