Hydrocracking tail oil ultra-deep adsorbent desulfurizing and denitrifying method

Abstract

The invention discloses a hydrocracking tail oil ultra-deep adsorbent desulfurizing and denitrifying method, wherein, hydrocracking tail oil with a certain content of sulphide and nitride is contacted with a hydrocracking tail oil ultra-deep adsorbent desulfurizing and denitrifying absorbent at certain temperature, pressure and airspeed, thereby obtaining desulfurized and denitrified hydrocracking tail oil which is absorbed and refined. The refined hydrocracking tail oil has a sulfur content lower than 10mug.g<-1> and a nitrogen content lower than 2mug.g<-1>, which satisfies requirements of hydroisomerized dewaxing material. The hydrocracking tail oil ultra-deep adsorbent desulfurizing and denitrifying method employs tower-type continuous operation of fixe bed, the process is simple and easy to realize, thereby overcoming disadvantages of the prior art that mixing and separating of liquid denitrifier and oil product is difficult, desulfurizing and denitrifying depths are insufficient, and operation is complex. Therefore, the method is especially applicable to ultra-deep adsorbent desulfurizing and denitrifying of hydrocracking tail oil.

Description

technical field [0001] The invention belongs to the field of petroleum refining and relates to a method for ultra-deep adsorption desulfurization and denitrification of hydrocracking tail oil. Background technique [0002] Hydrogenation tail oil is the product of hydrocracking reaction, most of the impurities have been removed, the content of sulfur and nitrogen is very low, the content of aromatics is low, the content of saturated hydrocarbons is high, and the viscosity index is high. It is a valuable high-grade base oil resource. When hydrogenated tail oil is used as raw material to produce lubricating oil base oil, the use of isomerization dewaxing can obtain higher quality base oil than catalytic dewaxing and solvent dewaxing. [0003] Normally, the sulfur and nitrogen content of most hydrocracking tail oils are relatively low. However, the level of sulfur and nitrogen content in tail oil is closely related to the composition of hydrocracking feedstock, conversion depth...

AI Technical Summary

Problems solved by technology

Although the final raw material obtained by this method meets the requirements of hydroisomerization dewaxing raw material, hydrofining is used in the process, the process is relatively complicated, and the investment cost is high, which brings certain difficulties to industrial promotion and application.

[0007] As mentioned above, the existing technology mainly has the following problems: 1. It is difficult to mix and separate the liquid denitrification agent and the oil product. The base oil after denitrification still needs a certain amount of white clay to be refined, and the waste white clay will cause certain damage to the environment. 2. The depth of adsorption desulfurization and denitrification is not enough to meet the purpose of deep desulfurization and denitrification; 3. The process is complicated, and the use of hydrogenation refining increases the investment cost

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