Catalytic diesel oil treatment process

Abstract

The invention provides a catalytic diesel oil treatment process which comprises the following steps: pretreating catalytic diesel oil to obtain an aromatic hydrocarbon-rich material and an alkane-rich material, and recovering a pretreating agent from the aromatic hydrocarbon-rich material to obtain an aromatic hydrocarbon fraction; the aromatic fraction enters a fractionation unit and is separated to obtain a light fraction, a middle fraction and a heavy fraction; the heavy fraction enters a fixed bed hydrogenation reaction zone for a reaction, a liquid phase effluent, a middle fraction and hydrogen obtained after the reaction enter a fluidized bed hydrogenation reaction zone for a reaction, a gas phase and a liquid phase are obtained after the reaction effluent is separated, and the obtained liquid phase enters a fractionation unit for treatment. The treatment process disclosed by the invention realizes reasonable and efficient conversion of each component of the catalytic diesel oil, greatly reduces hydrogen consumption, remarkably improves the quality and yield of high-added-value aromatic hydrocarbon products, and greatly prolongs the operation cycle of a device.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, and particularly relates to a high-efficiency conversion process for catalyzing diesel oil. Background technique [0002] At present, the total annual processing capacity of catalytic cracking units in my country has exceeded 170 million tons, and the annual output of catalytic diesel has reached 35 million tons. In recent years, on the one hand, with the deterioration of crude oil quality, the raw materials processed by catalytic cracking are also becoming heavier and inferior, resulting in increased operating severity of catalytic cracking units and reduced quality of catalytic diesel; on the other hand, in order to reduce gasoline olefins At the same time, many catalytic devices use MIP, MIP-CGP or FDFCC technology, but these technologies can produce more propylene and effectively reduce gasoline olefins, and further deteriorate the quality of catalytic diesel. Although the pro...

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Problems solved by technology

[0004] In order to solve the existing problems in the prior art, the main purpose of the present invention is to provide a catalytic diesel oil treatment process, which is based on the concept of molecular oil refining by separating catalytic diesel oil according to different hydrocarbon components, combined with pretreatment, Fractional distillation, fixed bed-ebullating bed hydrogenation combined process, processing different aromatics in catalytic diesel feedstock with suitable reaction paths, solving the problem of high aromatics content and complex composition in the existing catalytic diesel process. In the process of hydrogen conversion, there are technical problems such as strong heat release, easy generation of hot spots, difficult control of the reaction process, poor product quality, low yield and short operation period of the device. Realize reasonable and efficient conversion of various components of catalytic diesel, greatly reduce hydrogen consumption, and high added value The quality and yield of aromatic products have been significantly improved, and the operating cycle of the unit has been greatly improved

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