A combined process method for processing low-quality diesel oil

Abstract

The invention discloses a combination method used for processing inferior diesel oil. According to the combination method used for processing inferior diesel oil, secondary processing of inferior diesel fractions comprises following steps: hydro-upgrading reaction is carried out firstly, and aromatic hydrocarbon selective ring-opening reaction is carried out; a reaction effluent is separated so as to obtain a liquid material, and the liquid material is extracted; aromatic hydrocarbon components are taken as catalytic cracking raw materials and are subjected to catalytic cracking reaction, and a gas material, catalytic gasoline and catalytic diesel oil are obtained via separation and fractionation; and catalytic diesel oil can be recycled back to a hydro-upgrading reactor. The combination method is capable of converting inferior diesel oil into catalytic gasoline products with high octane value as much as possible, increasing gasoline yield and octane value of a catalytic unit as far as possible, and providing an economical feasible technical route for inferior diesel oil processing.

Description

technical field [0001] The invention relates to a method for processing inferior diesel oil, in particular to a combined process method suitable for processing inferior catalytic cracking diesel raw materials. 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 index of diesel oil i...

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Problems solved by technology

[0005] CN101463274A introduces an improved combination process of hydrocarbon oil hydrotreating and catalytic cracking, including, first, various inferior raw materials are subjected to hydrotreating, and the obtained tail oil is cut and then subjected to catalytic cracking, so that more gasoline can be obtained Or diesel products, although the characteristics of different oil components after cutting are used for segmental processing, the degree of ring-opening saturation of raw materials before entering catalytic cracking is still low, and it is difficult to increase gasoline and the quality is relatively low. Low

Although it is possible to process low-quality diesel from catalytic cracking, which greatly increases the processing methods of low-quality raw materials and converts them into high-quality products, it still belongs to the conversion process in the hydrogenation process, which fails to complete the matching with the catalytic cracking process. units are not beneficial

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