Method for producing needle coke by combined process

Abstract

The invention discloses a method for producing needle coke by a combined process. In the method, catalytic cracking and delay coking liquid-phase products enter a fractionating tower together, gas, gasoline, diesel oil and heavy oil are separated, the heavy oil directly enters an aromatic hydrocarbon extraction device, raffinate oil from which a solvent is recycled directly enters a catalytic cracking device to be recycled, and extract oil from which the solvent is recycled enters a delay coking device. In the process, the heavy oil part of the catalytic cracking and delay coking products is subjected to aromatic hydrocarbon extraction, and the raffinate oil is subjected to catalytic cracking to be recycled, so that the property of catalytic cracking recycle oil is improved, the yield of the coke is reduced, and the processing capacity of the catalytic cracking device is improved; and the extract oil is rich in aromatic hydrocarbons, and the needle coke with high performance can be produced through the delay coking device.

Description

technical field [0001] The invention relates to a method for treating hydrocarbon oil including catalytic cracking process and other conversion steps, more specifically, a method for preparing needle coke by combining three processes of catalytic cracking treatment, aromatics extraction treatment and delayed coking method to produce light oil at the same time. Background technique [0002] Catalytic cracking is an important heavy oil processing method. The traditional processing method for the heavy cycle oil obtained in the catalytic cracking process is mainly full or partial re-refining, and the re-refining ratio is generally 0.3-0.7. Catalytic cracking heavy cycle oil is rich in aromatics, and aromatics are non-ideal feedstocks for catalytic cracking. Therefore, this method allows heavy aromatics to circulate continuously in the catalytic cracking unit, which will inevitably result in low yield of light oil, large amount of coke, and increased regeneration. The device lo...

AI Technical Summary

Problems solved by technology

Catalytic cracking heavy cycle oil is rich in aromatics, and aromatics are non-ideal feedstocks for catalytic cracking. Therefore, this method allows heavy aromatics to circulate continuously in the catalytic cracking unit, which will inevitably result in low yield of light oil, large amount of coke, and increased regeneration. reduce the load of the heavy oil catalytic cracking unit and reduce the economic benefits

[0003] CN1133338A discloses a combined process for producing high-quality catalytic cracking raw materials, which combines coking and lubricating oil extraction devices, and extracts coking wax oil with lubricating oil extract, so that the alkali nitrogen and colloid content of coking wax oil is greatly reduced. To provide high-quality raw materials for the catalytic cracking unit, this method recycles the coking of the extracted oil rich in aromatics, and only produces ordinary coke out of the unit, so that it is not effectively utilized, and a good raw material for preparing needle coke is wasted

[0004] CN87107146A discloses catalytic cracking-catalytic heavy oil aromatics extraction combined process is the combination of catalytic cracking process and double solvent extraction aromatics process, in order to adapt to the heavy process of catalytic cracking feedstock oil, this process can reduce coke yield, improve catalytic Cracking unit processing capacity, but no further description of the resulting heavy oil aromatics processing process

However, in the later stage of the delayed coking reaction, the polymerization reaction is the main factor, the generation rate of cracked gas slows down, and the ability to escape gas products becomes weaker and weaker, which is not enough to form sufficient side pressure and shear force, so that the entire anisotropic region is discharged when the gas flow is discharged. forced alignment

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