Combined process method for processing heavy oil

Abstract

The invention relates to a combined process method for processing heavy oil, which comprises the following steps of: separating and grading the introduced heavy oil material by using a decompression deep-distillation device, and cutting the heavy oil material into decompression deep-distillation wax oil and inferior superheavy oil; introducing the inferior superheavy oil into a solvent deasphalting device to obtain treated solvent deasphalting heavy oil; and introducing the decompression deep-distillation wax oil and the solvent deasphalting heavy oil into a catalytic cracking reaction device with different reaction areas/sections or reactors for reaction. The combined process method is suitable for processing heavy oil under normal pressure and reduced pressure and is particularly suitable for the process of processing inferior residual oil with high metal content, high residual carbon content, high condensed ring substance content and high nitrogen content.

Description

technical field [0001] The invention relates to a heavy oil lightening processing method under non-hydrogen-facing conditions, more specifically, a heavy oil vacuum deep drawing-solvent deasphalting-catalytic cracking combined process method. Background technique [0002] The processing of fuel oil is first to distill the crude oil in the regular vacuum distillation tower to separate the light distillate gasoline, kerosene, diesel oil, etc. in the crude oil, and then put the heavy distillate and tower bottom residue into catalytic cracking, coking and other devices Secondary processing is carried out to convert it into light oils. The distillate oil in the product of crude oil distillation has a low carbon residue value and little heavy metal content; while the bottom residue oil has a high carbon residue value and a high heavy metal content, and the properties of the two are quite different. For this reason, refineries can take measures to take out more light fractions in ...

AI Technical Summary

Problems solved by technology

There are great differences in the reaction performance of the two, the adsorption capacity for the active sites of the catalyst, and the coke formation performance. There must be vicious competition when they coexist in the same reaction system.

However, there are problems with this kind of method. First, it involves the residual oil hydrogenation process, which requires a large investment in the construction of a residual oil hydrogenation unit, which is impractical for many refineries; second, the oil slurry is returned to the solvent deasphalting unit. The easy-to-crack components in the oil slurry can be better recovered, but the catalytic oil slurry contains catalytic cracking catalyst powder, and through solvent extraction, some catalyst powder is still carried into the deasphalted oil (DAO), and DAO is sent to hydrogenation After the installation, the catalytic cracking catalyst powder is easy to deposit on the hydrogenation catalyst (or its bed), causing the pollution of the hydrogenation catalyst or the blockage of the bed

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