A kind of catalytic cracking diesel oil hydrogenation conversion method

Abstract

The invention discloses a hydrogenation conversion method of catalytic cracking diesel oil. After the catalytic diesel is mixed with hydrogen, it first enters the hydrofinishing reactor for hydrofinishing reaction; the hydrofinishing reaction effluent directly enters the hydrocracking reactor, and reacts with the graded catalyst bed in the cracking reactor; the hydrogenation At least two cracking catalyst beds are arranged in the cracking reactor, and the hydrogenation activity of the hydrocracking catalyst tends to decrease according to the flow direction of the reaction materials; the hydrocracking reaction effluent is separated and fractionated to obtain naphtha and diesel oil. The method of the invention can reduce excessive hydrogenation and secondary cracking of cracked naphtha while ensuring the effect of hydrocracking of diesel oil, and reduce chemical hydrogen consumption, thereby increasing the octane number and liquid yield of naphtha.

Description

technical field [0001] The invention relates to a method for hydrogenation treatment of hydrocarbons, in particular to a method for hydrogenation conversion of catalytic cracking diesel oil. Background technique [0002] Since the beginning of the new century, with the increasing awareness of environmental protection, the stricter national environmental protection regulations and the rapid development of the national economy, the demand for clean motor fuels has been increasing all over the world. Catalytic cracking (FCC) technology is one of the main technological means for lightening heavy oil, and it occupies a relatively important position in oil refining enterprises all over the world. The annual processing capacity of catalytic cracking units in my country has exceeded 100 million tons, second only to the United States. In the composition of gasoline and diesel products, catalytic cracking gasoline accounts for about 80%, and catalytic diesel oil accounts for about 30...

AI Technical Summary

Problems solved by technology

But at present, there are also some problems in the existing technology. The main purpose of high aromatics diesel conversion technology is to convert high aromatics diesel into high octane gasoline components. At the same time, reduce the sulfur content of diesel and improve the cetane number of diesel, gasoline There is a contradiction between the hydrogenation of diesel components and diesel components. When the hydrogenation capacity of the catalyst in the cracking section is too strong, the gasoline components produced by cracking will be excessively hydrogenated, and the octane number of the product will be low. However, when the hydrogenation capacity of the catalyst in the cracking section is insufficient , the quality of diesel products is poor, and at the same time, it will accelerate the carbon deposition rate of the catalyst and affect the long-term operation

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