Utilization method of catalytic cracking diesel

Abstract

The invention relates to a utilization method of catalytic cracking diesel, wherein the method comprises the following steps: (1) separating the catalytic cracking diesel into a component with the boiling point being less than 230 DEG C and a component with the boiling point being more than 230 DEG C; (2) hydrogenering for the component with the boiling point being more than 230 DEG C obtained inthe step (1) under the condition that poly-aromatic hydrocarbon is inverted into monocyclic aromatic hydrocarbon; (3) separating the component with the boiling point being less than 230 DEG C obtained in the step (1) and hydrogenation product obtained in the step (2) to obtain diesel rich in the monocyclic aromatic hydrocarbon, and catalytically cracking the diesel rich in the monocyclic aromatichydrocarbon. In the method, firstly, the catalytic cracking diesel is separated into the component with the boiling point being less than 230 DEG C and the component with the boiling point being morethan 230 DEG C, and then the poly-aromatic hydrocarbon in the component with the boiling point being more than 230 DEG C can be hydro-fined into the monocyclic aromatic hydrocarbon, therefore, the hydrogenation selectivity can be improved, and the FCC gasoline with high content of aromatic hydrocarbon and high octane number can be obtained.

Description

technical field [0001] The invention relates to a utilization method of catalytic cracking diesel oil. Background technique [0002] With the deterioration of crude oil resources, the processing of sour oil, and the increase in the ratio of slag in fluidized catalytic cracking (FCC) raw materials, the properties of catalytic cracked diesel oil (LCO) are getting worse, mainly manifested by extremely high cetane number. Low (<25). [0003] The method of LCO upgrading is usually hydrorefining or hydro-upgrading as a diesel product or a blending component (European Ш diesel requires a cetane number greater than 51). For the hydro-upgrading of the above-mentioned low-quality LCO, it is necessary to increase its cetane number by more than 25 units in order to meet the emission requirements of the European Union Ш. However, the hydro-upgrading of this inferior LCO requires a large amount of hydrogen consumption and a very low reaction space velocity, and the cost of device con...

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Problems solved by technology

[0012] In the above method, the low-quality LCO is hydrogenated and saturated first, and then used as the feed to the FCC unit. Although the utilization rate of the low-quality LCO can be improved to a certain extent, the use of the product of the hydrogenation process as the raw material of the FCC unit will lead to a decrease in aromatics in FCC gasoline. The content is reduced, which leads to a decrease in the octane number of FCC gasoline

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