| 摘要 |
A process for significantly decreasing the acid sludge settling time in waste oil recovery processes comprising the steps of heating used oil to a high temperature above 725 degrees Fahrenheit (4), cooling the heated oil (6), adding an oxidizing agent to the oil (8), allowing the acid sludge to settle within a period of approximately 24 to 72 hours (24), separating (12) the acid-sludge-free oil (14) from the acid sludge (16) which settles out of solution as a result of addition of the oxidizing agent, and adding a polishing agent (10) and separating the re-refined oil (17) from the spent polishing agent (19). The spent polishing agent (19) is recycled, and the acid sludge (16) which settles out after oxidation is converted to either hard, oxidized asphalt or soft asphalt or asphalt products such as emulsions etc. The process produces a high quality re-refined oil (17) rapidly and economically with no acid sludge disposal problem.
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