Hydrocracking pretreatment method for high-nitrogen high-dry-point raw material

Abstract

The invention discloses a hydrocracking pretreatment method for high-nitrogen high-dry-point raw oil. The method comprises the following steps: (1) under hydrofining process conditions, high-nitrogenhigh-dry-point raw oil and hydrogen are mixed and enter a hydrofining reactor for a hydrofining reaction, the hydrofining reactor at least comprises two hydrofining catalyst beds, the upper portion ofeach hydrofining catalyst bed is filled with a hydrofining catalyst A, and the lower portion of each hydrofining catalyst bed is filled with a hydrofining catalyst B; (2) a hydrogenation reaction effluent obtained in the step (1) enters a hydrocracking reactor for a hydrocracking reaction, and the hydrocracking reactor is filled with a hydrocracking catalyst; and (3) a hydrocracking reaction effluent obtained in the step (2) enters a separation system to be separated to obtain one or more of gas, naphtha, aviation kerosene and diesel and tail oil.

Description

technical field [0001] The invention relates to a hydrocracking pretreatment method for high nitrogen and high dry point raw material oil, in particular to a hydrocracking method for high nitrogen and high dry point wax oil, and a method for producing high-quality products through hydrocracking. Background technique [0002] In modern oil refining technology, hydrocracking refers to those hydrogenation processes in which more than 10% of macromolecular compounds in raw materials are converted into small molecular compounds through hydrogenation reaction. It has strong adaptability to raw materials, great flexibility in production schemes, Good product quality and other characteristics, so it has become one of the important technologies for deep processing of heavy oil. The core of hydrocracking technology is catalyst, including pretreatment catalyst and cracking catalyst. Among them, the main function of the hydrocracking pretreatment catalyst is to remove impurities such a...

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Problems solved by technology

[0010] The above method grades catalysts with different pore diameters, and the pore diameters of the catalysts gradually decrease along the flow direction. This method can

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