With the development of chemical technology and industrial modernization, the quality requirements for lubricants have gradually increased. Lubricant base oils contain a large number of polycyclic aromatic hydrocarbons, alkanes, and highly polar substances that affect their viscosity and oxidation. The traditional refining method uses phenol and furfural as raw materials to extract its aromatics, but due to its poor solubility and insufficient refining depth, it is gradually replaced by the NMP refining process. As early as the mid 1970s, due to its outstanding advantages, foreign countries attach great importance to the development of N-methyl pyrrolidone refining processes and realize the industrialization of NMP refining processes. Krishna et al. [5] of the Indian Institute of Petroleum, respectively, adopted NMP refining methods and furfural refining The method was used to experimentally study the spindle oil fractions of Oman crude oil.
