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Abstract
A process to recover base oil from waste lubricating oil is proposed in this study, which is based on solvent extraction with membrane. In this process, organic solvent is circulated in a closed loop, leading to a resource saving. Residue consists of only impurities in waste lubricating oil, such as suspended particles, aqueous droplets, soot and tar, leading to a waste reducing. This process includes a fractional distillation, too, but it is for separating out organic solvent from oils. Then, temperature for fractional distillation is lower than 100 °C, leading to an energy saving. Rubber film is utilized as membrane, whose polymer network structure works as filter to separate impurities from oil dissolved in solvent. In order to verify the feasibility of this process, effect of extraction period, solvent volume and extraction temperature on both yield and quality of the extracted oil was experimentally estimated.
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