Abstract: With the upgrading of lube base oil quality and the increasing demand of high-grade base oil, hydrogenation technology is gradually replacing traditional methods for producing the API II and API III base oils. Poly alpha olefin (PAO) has been developed rapidly as API IV base oil. In recent years, the technology development of high-grade lubricant oil has been paid more attention at domestic and overseas. Hydrotreating-hydroisomerization-hydrofinishing supplement refining process and PAO hydrogenation process have become the main methods to produce high-grade lubricating oil. In addition, the development of hydrotreating catalysts and hydrotreating process for producing lubricant base oil is summarized. The present technology and prospect of hydrotreating process for producing high grade lubricant base oil are introduced.

Key words: lubricating oil, catalyst, hydroisomerization, hydrogenation process