Combination method of catalytic diesel hydroconversion and catalytic gasoline selective hydrogenation

Abstract

The invention discloses a combination method of catalytic cracking diesel oil hydrogenation conversion and catalytic gasoline hydrogenation. Catalytic cracked diesel oil mixed with hydrogen enters the hydrogenation pretreatment reactor for hydrofining reaction; the refined effluent directly enters the cracking reactor, and contacts with the catalyst bed layer loaded in the cracking reactor; the cracking reactor is equipped with at least For the two hydrocracking catalyst beds, according to the flow direction of the reaction materials, the hydrogenation activity of the hydrocracking catalyst beds tends to decrease. The hydrocracking effluent enters the hot fraction for separation, and the liquid phase part is decompressed and mixed with catalytic cracking gasoline and new hydrogen, and directly enters the gasoline hydrogenation reactor without heating for hydrodesulfurization reaction. The method of the invention avoids further cracking of the cracked naphtha, increases the selectivity of the naphtha, improves the octane number of the gasoline, and simultaneously increases the yield of liquid products of hydrocracking.

Description

technical field [0001] The invention relates to a hydrocarbon hydrogenation treatment method, in particular to a combined method of catalytic diesel hydrogenation conversion and catalytic gasoline selective hydrogenation. 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 d...

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Problems solved by technology

[0005] Aiming at the existing problems in the production process of high-octane gasoline, the present invention provides a combined method of catalytic diesel hydrogenation conversion and catalytic gasoline selective hydrogenation to improve the production process of high-octane gasoline

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