What are the composition and production process of lubricating oil?

Traditional production process In 1930s, the production of lube base oil basically adopted physical methods, that is, the "old three sets" traditional process consisting of solvent refining, solvent dewaxing and clay supplementary refining was used to produce lube base oil. (1) solvent refining. Solvent refining is an important step in lubricating oil production. Its main function is to remove polycyclic aromatic hydrocarbons, resins and asphaltenes. From oil products, thus improving the viscosity-temperature performance, oxidation stability, carbon residue value, color and other properties of lubricating oil. Mature process, commonly used solvents are furfural, phenol and N- methylpyrrolidone (NMP). (2) solvent dewaxing. The solvent dewaxing process mainly includes crystallization, filtration, solvent recovery and freezing. Its purpose is to remove paraffin from oil products and reduce the pour point of lube base oil. This process has technical advantages in processing light raw materials, with high yield of dewaxed oil and high viscosity index. In order to reduce energy consumption, operating expenses and investment, domestic and foreign lubricant base oil manufacturers have adopted the process of combining solvent dewaxing and wax deoiling, which has greatly improved energy saving and wax yield in recent years.