Improve the performance of petroleum products. The main function of hydrogenation is to improve the properties of oil products. With the increasing awareness of national environmental protection, the requirements of laws and regulations are getting higher and higher. Hydrogenation is an irreplaceable means to remove S, N, O and some metal elements from oil products and saturate some olefins to improve the quality of oil products. The odor in oil is mainly sulfur-containing compounds, and the color is mainly caused by basic nitrides and some colloidal asphaltenes with poor oxidation stability. These elements can be removed by hydrogenation.