Abstract: The flocculation refining and solvent refining experiments was carried out to show that solvent refining is better for the recycling the lubricating oil waste. The optimal conditions of furfural refining were as follows: the ratio of solvent and oil 1.5, refining temperature 80 ℃|while the optimal condition of NMP refining was 1.0, refining temperature 60 ℃, so the furfural refining had a larger economic profits. Under the optimal technology conditions, the properties of the recovered oil were listed as follows: viscosity index 102.6, 25 ℃ refractive index 1.459 4, colourity 1.0, solidifying point -16 ℃, w(carbon residual)0.499%, w(S)0.057%, oil recovery 93.96%. According to this result, the recovered oil could reach the HVI standard of base oil. And the recovered oil could be used as finished lubricating oil after adding suitable amounts of additives.

Key words: Lubricating oil waste, Flocculation refining, Solvent refining

摘要： 对比絮凝精制和溶剂精制的实验结果可知，采用溶剂精制回收废润滑油的效果较好。溶剂精制回收废润滑油的最佳工艺条件如下，糠醛精制：剂油比1.5,精制温度80 ℃；NMP精制：剂油比1.0，精制温度60 ℃。综合考虑，采用糠醛精制的经济效益较高。在糠醛精制的最佳工艺条件下，回收的废内燃机油经处理后的粘度指数为102.6，25 ℃折光率为1.459 4，色度为1.0，凝点为-16 ℃，w(残炭)为0.499%，w(S)为0.057%，收率为93.96%。回收后的油品经添加适当的添加剂调和后可循环使用。

关键词: 废润滑油, 絮凝精制, 溶剂精制