Combined technique for improving yield of high-octane gasoline by using inferior catalytic cracking diesel

Abstract

The invention relates to a combined technique for improving yield of high-octane gasoline by using inferior catalytic cracking diesel. The combined technique comprises the following steps: firstly, carrying out polycyclic aromatic hydrocarbon selective hydrogenation, desulfurization and denitrification reaction on the inferior catalytic cracking diesel through a hydrofining reactor at a hydrogen atmosphere and under a relatively gentle refining condition; feeding a refined liquid-phase product into a reactor for conversion to light fraction and filled with a noble metal catalyst and carrying out hydrogenation conversion to light fraction; and finally, achieving the purpose of increasing the yield of the high-octane gasoline. By the technique, the inferior catalytic cracking diesel can be treated, and meanwhile, reforming C10+ heavy aromatics are converted to light fraction; the combined technique has relatively high gasoline fraction yield, gasoline fraction aromatics selectivity and liquid yield, and meanwhile, the inferior catalytic cracking diesel and the C10+ heavy aromatics are utilized effectively at high value.

Description

technical field [0001] The invention belongs to the field of processing and utilization of inferior catalytic cracking diesel oil, and in particular relates to a combined process method for producing high-octane gasoline from inferior catalytic cracking diesel oil. Background technique [0002] Catalytic cracking diesel is the main product of catalytic cracking process. As of 2014, the output of catalytic cracking diesel in my country is about 40 million tons per year. Due to the heavy and inferior quality of crude oil, the raw materials processed by the catalytic cracking unit are deteriorating day by day, resulting in the deterioration of the quality of catalytic cracking diesel oil, and the density of some catalytic cracking diesel oil exceeds 0.95g / cm 3 , the content of aromatics exceeds 80%, and the cetane number is lower than 20. In addition, the catalytic cracking process technology basically does not have the ability to destroy the aromatic rings in the feed. FCC die...

AI Technical Summary

Problems solved by technology

However, since FCC diesel contains more olefin compounds and sulfur and nitrogen compounds, this method has the disadvantages of large extraction solvent loss, poor extraction effect, and high sulfur and nitrogen content in the raffinate oil.

[0008] Therefore, as of now, there is still a lack of technology for efficient utilization of inferior catalytic diesel

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