Under the condition of different solvent to oil ratios and different temperature, the solvent of ethanol, furfural and N-methyl-pyrrolidone (NMP) were used for refining lubricating oil.

• 用乙醇、糠醛、N-甲基吡咯烷酮(NMP)在不同剂油比、不同温度下对废润滑油中的润滑油馏分进行溶剂精制。