Industrial waste oil recovery is mainly for all kinds of oil products discharged during the processing of mechanical products and after the operation of various vehicles and machinery.

Industrial waste oil can also be divided into two categories according to the source: one is the cleaning, smoothing, cooling and thermal disposal of mechanical products during processing, mechanical equipment and equipment operation, transmission oil. This kind of oil is involved in various additives, and in the process of use due to mechanical wear and other reasons mixed with various physical and chemical impurities, removing them becomes the key to the re-application of this kind of oil. The second is all kinds of vehicles, machinery after the operation of all kinds of smooth oil products, because such oil products are only smooth, so the industrial waste oil recovery process is relatively simple.

The recovery process of industrial waste oil is divided into three parts, which are dehydration, refining and separation stages. High frequency demulsification dehydration was used for pre-treatment. Distillation - pickling - clay process was used for refining. In the separate part, all kinds of oil components in the waste oil are cut into three parts: light, neutral and base oil. The process is divided into three parts: dehydration, refining and separation. The local dehydration includes two stages: high frequency demulsification dehydration and thermal distillation dehydration. The refining part includes three stages: synthesis, impurity removal and decolorization. The separation part is to divide the mixed oil into light oil, neutral oil and base oil by distillation. This process can handle industrial mixed waste oil products with many components, different physical and chemical application processes, large impurity content and uncertain composition.