Since the sulfur element is mainly concentrated in the macromolecular polycyclic polar aromatics, when the aromatics content in the base oil is very low, most of the sulfur has been removed, so the sulfur content generally meets the index requirements. The viscosity index is related to the saturated hydrocarbon content in the base oil, but it is not a simple linear relationship, but is determined by the total amount of saturated hydrocarbons and the ring distribution of paraffins, cycloalkanes and cycloalkanes that constitute saturated hydrocarbons. .
In order to obtain base oil products with high viscosity index, in addition to the higher saturated hydrocarbon content of the base oil, the saturated hydrocarbons should also have a reasonable distribution in the composition of paraffins and naphthenes, in order to achieve the goal. To further increase the saturated hydrocarbon content in the base oil, it can be achieved by increasing the reaction depth and reducing the aromatic content. However, from the reaction point of view, the saturated hydrocarbon conversion reaction has become the main reaction in the system. A large amount of saturated hydrocarbons are converted, which will greatly reduce the yield of lubricating oil fractions and even reduce the viscosity grade of the base oil product.
If the method of controlling the aromatics content in the hydrotreating feed is adopted, it can not only ensure the full conversion of aromatics, but also prevent the excessive cracking of saturated hydrocarbons, so that the goals of increasing the viscosity index and reducing the aromatics content can be guaranteed at the same time. Therefore, in the lubricating oil medium pressure hydrotreating process, in order to obtain high-yield and high-quality products, it is necessary not only to carefully select the appropriate pressure, temperature, catalyst and other conditions, but also to properly control the aromatic content in the feed to ensure high An important factor for quality and high yield base oil products.
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