Counter flow hydrogenation method of catalytic-cracked heavy oil

Abstract

The invention relates to a counter flow hydrogenation method of catalytic-cracked heavy oil. According to the method, catalytic-cracked heavy oil is heated by using a catalytic-cracked heavy oil heating furnace, and is delivered into a hydrogenation reactor from the top of the reactor; the catalytic-cracked heavy oil contacts a hydrogenation catalyst with a down-flow manner; hydrogen is heated by using a hydrogen heating furnace, and is delivered into the hydrogenation reactor from the bottom of the reactor; the hydrogen passed through a hydrogenation catalyst bed with an up-flow manner; two phases which are the catalytic-cracked heavy oil and hydrogen are subject to counter flow contact, such that the hydrogenation reaction is completed; a liquid flow is discharged from the bottom of the hydrogenation reactor after the reaction is finished, and a gas phase glow is discharged from the top of the hydrogenation reactor; and with the controlling over an outlet temperature of the hydrogen heating furnace, the temperature in the lower part of the hydrogenation reactor is lower than that in the upper part of the hydrogenation reactor. According to the invention, hydrogen and the raw material oil are subject to counter flowing; hydrogen partial pressure at the lower part of the reactor is higher than that at the upper part of the reactor, and the temperature at the lower part of the reactor is lower than that at the upper part of the reactor. The conditions are beneficial for saturated reaction of polycyclic aromatic hydrocarbon. With the method, relatively high hydrodesulfurization rate, hydrodenitrogenation rate, and polycyclic aromatic hydrocarbon saturation rate can be achieved.

Description

Technical field [0001] The invention relates to a method for refining hydrocarbon oil in the presence of hydrogen, more specifically, a countercurrent hydrotreating method for catalytically cracked heavy oil. Background technique [0002] With the increasing scarcity of petroleum resources and the tendency of crude oil to become heavier and worse, how to use limited resources to maximize the production of light products has become a hot spot in the development of oil refining technology. In the processing flow of the refinery, the main technical means to realize the conversion of heavy oil are catalytic cracking, hydrocracking and coking technologies. In my country, catalytic cracking has been widely used due to its good operational flexibility, high gasoline yield, and low one-time investment. In order to increase the conversion rate and light oil yield of the existing catalytic cracking unit, the heavy oil (heavy cycle oil) produced by the catalytic unit is usually circulated ...

AI Technical Summary

Problems solved by technology

Although the method adopts the form of countercurrent, the temperature rises slightly from top to bottom along the reactor.

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