Hydrotreatment method for lubricant base oil

Abstract

The invention discloses a hydrotreating method for lubricant base oil. The method relates to a direct grading combination of three different catalysts, namely a conventional roasted type I catalyst, a type II catalyst containing an organic auxiliary agent, and a type II catalyst which has a barrier based on silicon modification and is rich in active phases. Lubricating oil base oil feed firstly flows through the type I catalyst, then effluent is in contact with the type II catalyst containing the organic auxiliary agent, and finally the effluent is in contact with the type II catalyst which has a barrier based on silicon modification and is rich in active phases, so that the purpose of deeply removing sulfur and nitrogen impurities is achieved, and meanwhile, the stability of the catalyst is improved.

Description

technical field [0001] The invention relates to a hydrotreating method for lubricating oil base oil, in particular to a hydrotreating method suitable for raw materials of high nitrogen lubricating oil base oil. Background technique [0002] At present, the domestic market has increasingly stringent quality requirements for lubricating base oils. Isomerization dewaxing technology is the most effective means to realize the production of high-quality lube base oil, and this process is usually realized by hydroprefining-isomerization dewaxing-supplementary refining. When producing lubricating oil base oil through isomerization dewaxing process, one of the key ways to improve the quality of base oil is to select a hydrotreating catalyst with high-efficiency desulfurization, denitrogenation and aromatic hydrocarbon saturation functions to provide more high-quality raw materials (sulfur Nitrogen qualified, high viscosity index). The feed to the isomerization section requires a ni...

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Problems solved by technology

However, these improvements are not sufficient to meet refiners' increasingly stringent fuel requirements

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