Method for producing high-quality gasoline by catalyzing diesel oil hydro-conversion

Abstract

The invention discloses a method for producing high-quality gasoline by catalyzing diesel oil hydro-conversion, comprising the following steps: (1) high aromatic hydrocarbon catalytic diesel oil and recycle hydrogen are mixed to enter a hydrofining reaction zone for reaction, the hydrofining reaction zone is provided with at least two catalyst beds, and the vulcanization degree of the catalyst inthe material flow direction is in a decreasing trend; (2) the generated oil obtained in the step (1) enters the hydrocracking reaction zone to be in contact with a hydrocracking catalyst to carry outa ring-opening conversion reaction of polycyclic aromatic hydrocarbon; and (3) the generated oil obtained in the step (2) passes through a separation system to obtain gas, gasoline and diesel fractions, part of the diesel fractions can be recycled back to the hydrofining reaction zone, and the rest of the diesel is discharged out of the device. By the method, the problems of long initial adjustment period and long octane number and long-term low octane number of the main target product gasoline fraction in the technical application process can be solved.

Description

technical field [0001] The invention relates to the field of petroleum refining, in particular to a method for processing catalytic diesel to produce high-quality gasoline and simultaneously producing high-quality diesel. Background technique [0002] Catalytic cracking is currently the most important secondary processing process in the petroleum refining industry, and it is also the core process of lightening heavy oil. As the world's oil becomes increasingly heavy, the processing capacity of the FCC unit is also continuously improved. Using various heavy oils as raw materials, high-octane gasoline, the main product, is obtained through catalytic cracking reactions, and a large amount of sulfur, nitrogen, and aromatics are produced at the same time. Catalytic diesel oil with high content, low cetane number or cetane index, and extremely poor stability. Moreover, the requirements of environmental protection regulations are becoming more and more stringent, and the indicator...

AI Technical Summary

Problems solved by technology

However, the problem that the product cannot meet the standard for a long time in the early stage of technical operation is still not considered

[0006] The existing catalytic diesel hydroconversion industrial unit has the problem of long adjustment time at the initial stage of operation. The octane number of the 65-150 °C fraction in the first few days of industrial unit operation is very low, not reaching 80. With the gradual extension of the operating time , the research octane number gradually increases. After one month of device operation, the research octane number of the 65~150°C fraction can reach about 90. If the time is prolonged, the research octane number of the 65~150°C fraction will continue to increase , to reach more than 90

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