| 摘要 |
The present invention refers to a process to rerefine used petroleum oils by extraction with aliphatic solvents, characterised in that, after eliminating the extract solvent, the process comprises the following treatments: a) Flash continuous vaporization, at atmospheric pressure or near atmospheric pressure, to separate the light fractions, in the presence of small amounts of a basic compound or a reducing agent or a combination of both. b) Continuous distillation, in a fractionating column, of the bottom liquid obtained in stage a), under moderate vacuum and temperatures; in the presence of a basic compound or a reducing compound or a combination of both; with recirculation from the bottom of the column to its feed; separating, as lateral extractions, the vacuum gas-oil or spindle oil and the lubricant bases and, as bottom product, a fuel-oil or asphaltic component. <IMAGE>
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