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Re-cleansing and purification of waste engine oil by flocculation-absorption can be used as a pretreatment for further refined processing due to its features of low pollution, low cost and easy operability. This paper has sifted through various absorbents to locate the most appropriate one based on previous flocculation experiments, then to obtain optimal operational parameters. Experiments have demonstrated that best purification effect could be achieved under the following conditions: 12%~14% (W/V) active white clay at the reaction temperature of 120°C~130°C for about 30min. Chrominance and quality of waste engine oil could be markedly enhanced after flocculation-absorption method. Foreword Impurities like carbon deposits, colloid, and acid materials occur during the process of engine oil as a consequence of long-time contact with high-temperature generator triggering pyrolization and polymerization. [1] Meanwhile, other factors can cause quality deterioration of engine oil owing to friction-generating metal particles and moisture caused by combustion as well as the above-mentioned impurities. Degraded engine oil is characterized by color darkening, viscosity rising, acid value increasing and suspension appearing. However, lubricants can achieve70%~75% (W)basic oil recycling rate after removal of impurities and metamorphous materials [2]. Up to now, regeneration methods of waste engine oil worldwide are mainly as follows: re-purging, re-purification, refinement, among which the former is the prerequisite and basis of the latter, that is, further refinement after re-purification. Re-purging procedure aims to remove moisture, sludge and impurities existing stably in the form of colloid[3] with major processing techniques as precipitation, centrifuge, filtration, flocculation, absorption and so on [4]. This paper used waste engine oil recycled from certain 4s automobile store to be our research subject to be re-purified by flocculation-absorption. After selecting proper coagulant and absorbent, this paper also figures out the most influential factors and optimal parameters amid flocculation-absorption, and in the meantime, we can witness oil quality levelling up after treatment.

Experimental Study on Waste Engine Oil Processing by Means of Flocculation-absorption