Hydrodesulfurization-heavy oil catalytic cracking combination process of residue oil of high-sulfur crude oil

Abstract

The invention discloses a hydrodesulfurization-heavy oil catalytic cracking combination process of vacuum residue of high-sulfur crude oil. The process comprises the following steps: enabling the vacuum residue and an optional steam-out product of catalytic cracking oil slurry, optional catalytic cracking heavy cycle oil, and optional distillate oil to enter a residue hydrogenation unit together, performing a hydrogenation reaction in the presence of hydrogen gas and a hydrogenation catalyst, and separating reaction products to obtain gas, hydrogenated naphtha, hydrogenated diesel oil and hydrogenated residue; enabling the hydrogenated residue alone or together with vacuum gas oil to enter a residual fluid catalytic cracking unit, performing a cracking reaction in the presence of a cracking catalyst, and separating reaction products to obtain dry gas, liquefied gas, gasoline, diesel oil, heavy cycle oil and oil slurry, wherein the residue hydrogenation unit adopts a fixed bed reactor, and the fixed bed reactor is filled with a hydrogenation catalyst. The process has the advantages that the total sulfur content in the catalytic cracking product of high-sulfur vacuum residue is decreased to be less than 5 ppm, and the service life of the hydrogenation catalyst reaches 2 years or longer.

Description

technical field [0001] The invention relates to a combined process of residual oil hydrodesulfurization-heavy oil catalytic cracking, in particular to a combined process of residual oil hydrodesulfurization-heavy oil catalytic cracking of high-sulfur crude oil carried out with a specific catalyst. Background technique [0002] The residual oil mainly refers to the heavy components from the bottom of the atmospheric and vacuum device, among which the atmospheric residual oil is called the atmospheric residual oil, and the vacuum residual oil is called the vacuum residual oil from the decompression device. Vacuum residue oil is black and viscous, semi-solid at room temperature, and its properties are related to those of crude oil. In petroleum refineries, residual oil is often used to process products such as petroleum coke, residual lubricating oil, asphalt, or as a cracking raw material. [0003] At present, there are dozens of residual oil conversion processes available fo...

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Problems solved by technology

[0007] However, the existing residual oil hydrogenation process is aimed at vacuum residues in China and the Middle East. When the catalyst used is used for high-sulfur vacuum residues, the desulfurization effect is poor and the catalyst deactivates quickly.