| 摘要 |
<p>A method for separating used oil in a simple batch process into usable fractions. A pretreatment step involves forming a mixture of the used oil and specified pretreatment chemicals in a mixing tank (10). A reduced pressure is maintained by vacuum pump (25) throughout the process along with mixing of the formed mixture. Heat is applied at a predetermined rate corresponding to vaporization and recovery of usable fraction of aqueous, light hydrocarbons, base oil, and a pumpable residual. Each distillate fraction is removed as a vapor, condensed and collected. Undesirable cracking is avoided by maintaining a reduced pressure and avoiding rapid or localized heating within the mixture by mixing using mixer (12) during the distillation process. The base oil fraction may be further refined in a solvent extraction process. The process breaks the emulsion of used oil into usable fractions with minimal additional cracking or production of undesirable deposits or aromatics.</p> |
