Residual oil hydrogenation treatment and catalytic cracking combined method

Abstract

The invention discloses a residual oil hydrogenation treatment and catalytic cracking combined method, which comprises the following components: performing the hydrogenation treatment reaction of a residual oil raw material in the presence of hydrogen and a hydrogenation catalyst, separating product of the reaction to obtain a gas, hydrogenated naphtha, hydrogenated diesel and hydrogenated tail oil, wherein the gas is circularly used in a hydrogenation reaction, the hydrogenated naphtha and hydrogenated tail oil enter a catalytic cracking device to undergo a catalytic cracking reaction in the presence of a cracking catalyst; and separating the product of the reaction to obtain a dry gas, a liquefied gas, a gasoline fraction and a catalytic cracking heavy fraction, wherein the catalytic cracking heavy fraction is filtered to remove solid impurity and circulated to a hydrogenation treatment device. When the method is used, the quality of produced naphtha and diesel product can be improved; and particularly, the sulfur content in naphtha and diesel is lowered and the cetane number of diesel is improved.

Description

technical field [0001] The invention relates to a method for lightening residue oil, specifically a process for producing high-quality gasoline and diesel products by organically combining residue oil hydrotreating and catalytic cracking and using residue oil as a raw material. Background technique [0002] As crude oil becomes heavier and worse, more and more residues need to be processed. The processing of heavy and residual oil is not only to crack it into products with low boiling points, such as naphtha, middle distillate oil and vacuum gas oil, but also to increase their hydrogen-carbon ratio, which requires decarbonization Or hydrogenation method to achieve. The decarbonization process includes coking, solvent deasphalting, heavy oil catalytic cracking, etc.; hydrogenation includes hydrocracking, hydrofining, etc. The hydrogenation method can hydrogenate and convert residual oil, improve the yield of liquid products, and remove heteroatoms therein, and the product q...

AI Technical Summary

Problems solved by technology

However, in this method, a fractionation system is installed in both the hydrotreating and catalytic cracking processes, which increases the investment cost; due to the heat exchange in the process, the heat energy loss is more; at the same time, both the hydrotreating unit and the catalytic cracking unit have diesel products, relatively speaking , the total yield of gasoline and gas products will decrease

In addition, the cracking rate of residual oil in the residual oil hydrotreating unit is low, and the yield of naphtha and diesel oil obtained by fractional distillation of hydrogenated oil is limited

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