Combined process method for heavy oil modification

Abstract

The invention discloses a combined process method for heavy oil modification, which comprises the following steps of: mixing heavy oil raw materials and a hydrogen supply solvent for supercritical treatment, and making the heavy oil subjected to the supercritical treatment enter a catalytic cracking unit for treatment; and 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 slurry oil, wherein the heavy cycle oil partially or totally cycles for the supercritical treatment, and the slurry oil partially or totally cycles for the supercritical treatment. The supercritical treatment method for the heavy oil raw materials comprises the step of mixing the heavy oil raw materials and the hydrogen supply solvent for the supercritical treatment, wherein the hydrogen supply solvent comprises tetrahydronaphthalene or decahydronaphthalene. The method has the advantages of capacity of effectively improving the utilization rate of poor-quality heavy oil, low coking rate, stable production process, and suitability for light treatment of various heavy and poor-quality raw materials.

Description

technical field [0001] The invention relates to a combined process for upgrading heavy oil, in particular to a combined process for upgrading inferior heavy oil. Background technique [0002] At present, due to the depletion of oil resources and the increasing demand for oil due to economic development, oil resources are increasingly precious. Moreover, as crude oil resources become heavier, in the refining process of petroleum, the yield of residual oil is relatively high, generally 40%-50%. In addition, there are many heavy crude oils in the crude oil reserves in the world, most of which are residues, and they are low-quality residues with high impurity content. [0003] The currently industrialized methods for treating these residual oils or heavy oils include: catalytic cracking, residual oil hydrogenation, delayed coking, visbreaking and other methods or combined methods. As the residual oil becomes more and more inferior, and the content of sulfur, nitrogen and metal...

AI Technical Summary

Problems solved by technology

Because the heavy cycle oil produced in catalytic cracking contains polycyclic aromatic hydrocarbons, the yield of light oil is low and the amount of coke is large, which increases the load of the regenerator and reduces the processing capacity and economic benefits of the heavy oil catalytic cracking unit.

In addition, the sulfur content of heavy cycle oil is relatively high, about twice that of hydrogenated tail oil, and the cycle of heavy cycle oil also increases the sulfur content of the product

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