A method for stabilizing the quality of hydrocracking products

Abstract

The invention discloses a method for stabilizing the quality of a hydrocracking product. The method comprises the following steps that hydrocracking raw materials and hydrogen gas are mixed to enter ahydrocracking pretreatment reactor for refining reaction; reaction effluents enter a hydrocracking reactor for hydrocracking reaction; four hydrocracking catalyst bed layers are arranged in the hydrocracking reactor; hydrogenation posttreatment catalyst bed layers are arranged at the bottom of the hydrocracking reactor; when the conversion rate of fractions higher than 350 DEG C in hydrocrackingraw materials is 80 to 89 percent, the hydrogenation posttreatment catalyst bed layers are arranged between the hydrocracking catalyst bed layers; the volume ratio of hydrogenation posttreatment catalysts between the bed layers along the material flow direction to the hydrogenation posttreatment catalysts filled at the reactor bottom is (5 to 15):(10 to 30):(20 to 40):(30 to 50); the volume ratioof the hydrogenation posttreatment catalysts (total weight) filled in the hydrocracking reactor to hydrocracking catalysts (total weight) filled in the hydrocracking reactor is 1:(6 to 8); after hydrocracking products are separated, various products are obtained. By the method, the quality stability of the hydrocracking products can be obviously improved.

Description

technical field [0001] The invention relates to a method for stabilizing the quality of hydrocracking products, in particular to a method for stabilizing the quality of heavy naphtha products in late hydrocracking products during long-term operation. Background technique [0002] The hydrocracking process is under the action of hydrogen, high temperature, high pressure and catalysts to hydrodesulfurize, hydrodenitrogenate, polycyclic aromatic hydrocarbons, hydrosaturation and ring-opening cracking of heavy distillate oils (VGO, CGO, DAO). The process of converting into light oil and middle distillate oil has the characteristics of flexible operation, good product quality and environmental friendliness. As one of the main processes for the deep processing of heavy distillate oil, it is not only the production of light oil products in the refining industry It has become an important means of petrochemical enterprises, and has become the key technology of petrochemical enterpri...

AI Technical Summary

Problems solved by technology

[0010] Aiming at the problems in the prior art that the olefins that commonly exist in the late stage of the hydrocracking reaction process using post-treatment catalysts exceed the standard, that is, the bromine index of heavy naphtha is too high, the mercaptans are too high, and the sulfur of aviation fuel products exceeds the standard. The use of grading and temperature control provide a method to improve the quality stability of hydrocracking products

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