Hydrotreating method of heavy crude oil

Abstract

A hydrotreating method of heavy crude oil includes the heavy crude oil is contacted with a catalyst combination under hydrotreating reaction conditions, wherein the catalyst combination includes a hydrodemetallization catalyst I, a hydrodemetallization catalyst II and a hydrotreating catalyst III, and arrangement of the catalysts in the catalyst combination allows the crude oil to be successively contacted with the hydrodemetallization catalyst I, the hydrodemetallization catalyst II and the hydrotreating catalyst III; with the total amount of the catalyst combination as the benchmark, the content of the hydrodemetallization catalyst I is 5-60% by volume, the content of the hydrodemetallization catalyst II is 5-50% by volume, and the content of the hydrotreating catalyst III is 10-60% by volume; the hydrodemetallization catalyst II contains a molded alumina carrier which is characterized by a mercury intrusion method, the pore volume of the carrier is 0.95-1.2 ml / g, the specific surface area is 50-300 m<2> / g, the pore volume of pores having the diameter of 10-30 nm accounts for 55-80% of the total pore volume, and the pore volume of pores having the diameter of 300-500 nm accounts for 10-35% of the total pore volume.

Description

technical field [0001] The invention relates to a method for hydrotreating heavy raw oil. Background technique [0002] Different from distillate hydrotreating, heavy raw oil (such as residual oil, etc.) contains more metal impurities such as nickel and vanadium. After hydrotreating, these metal impurities are easy to deposit in the catalyst in the form of sulfide. And the surface, leading to catalyst deactivation and bed pressure drop increase, so that the stability of the hydrotreating process deteriorates and the operation cycle is shortened. [0003] Obviously, the operating time of fixed bed residue hydrotreating is related to the capacity of the catalyst to accommodate metal impurities. The hydrogenation catalyst with good metal capacity and the supporting processing method are beneficial to improve the adaptability of the device to high-metal low-quality raw materials and greatly prolong the operation period of the device, which has huge economic and social benefits....

AI Technical Summary

Problems solved by technology

[0002] Different from the hydrotreating of distillate oil, heavy raw oil (such as residual oil, etc.) contains more metal impurities such as nickel and vanadium. After hydrotreating, these metal impurities are easy to deposit in the catalyst in the form of sulfide. and the surface, resulting in catalyst deactivation and an increase in bed pressure drop, which deteriorates the stability of the hydrotreating process and shortens the operating cycle

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