Oil processing is not merely a necessary measure to combat the environmental problems but also an opportunity to produce useful industrial materials. It is possible to recycle and reuse various types of oils including hydraulic and industrial oils, gearbox lubricants, engine oil etc. Used engine oil can be processed into diesel fuel. During such process, the used oil is first purified from water and mechanical contaminants. The oil is evaporated, distilled and then adsorbed or coagulated. Depending on the engine oil processing technique, it is possible to obtain of the basic types of oil that can be further processing into commercial-grade oils via compounding or introducing additives.

In the course of processing, used engine oil is purified from acids, water and solid contaminants. Used oil processing is performed with the help of special equipment or centrifugal liquid purification units. Such units are capable of purifying process liquids of hydraulic systems, industrial and fuel oils and can remove contaminants from diesel fuel and kerosene. Oil purification units are widely used in many spheres of industry, including aircraft production, mechanic engineering, oil and gas industry, food production, vehicle maintenance facilities and many other enterprises that require oil processing.

The systems that utilize oil-filled electrical equipment include oil recovery units in their fill and operation cycle. Using such units to process the insulating oil helps in purifying the oil from products of its decomposition, water and mechanical impurities. Oil recovery units increase the breakdown voltage and lower the acidity of oil. These units consist of a centrifugal purification assembly (usually a SOG-type liquid purification unit), an absorber assembly and may also include the oil heating assembly.

Before processing the oil with the oil recovery unit, it is necessary to fill in the absorber assembly with appropriate sorbents, fill the unit with “dry” insulating oil and perform a test run.