Method for producing high-octane number gasoline by poor-quality diesel oil

Abstract

The invention relates to a method for producing high-octane number gasoline by poor-quality diesel oil. The method comprises the following steps: 1) the poor-quality diesel oil is introduced into a hydrofinishing reactor for a hydrofinishing reaction, a colloid compound, a sulphur nitrogen compound and other impurity are removed in the poor-quality diesel to obtain the hydrofinishing diesel oil; 2) the hydrofinishing diesel oil is introduced into the dehydrogenation reactor for a dehydrogenation reaction, napthene is dehydrogenated and converted to aromatic hydrocarbon, and dehydrogenation product oil is obtained; and 3) the dehydrogenation product oil is introduced into a heavy aromatics lightweight reactor to generate a selective hydrocracking reaction, a heavy fraction is subjected to cycle reaction at the temperature of more than 205 DEG C, and then is completely converted to the high-octane number gasoline. The method can completely convert the poor-quality diesel oil having high napthene aromatic hydrocarbons content to the high-octane number gasoline, and can increase the enterprise economic benefit.

Description

technical field [0001] The invention belongs to the field of clean oil production, and relates to a method for producing high-octane gasoline from low-quality diesel oil with relatively high naphthenic and aromatic content. Background technique [0002] With the improvement of environmental protection regulations, the production of high-quality diesel with low sulfur, low aromatics and high cetane number has gradually become the current production trend of diesel fuel for vehicles in various countries in the world. my country's environmental protection regulations also require the implementation of National V vehicle diesel standards nationwide in 2017. Among them, vehicle diesel products require sulfur content ≯10μg / g, polycyclic aromatic hydrocarbon content ≯11%, and cetane number ≮51. On the other hand, the deterioration and heavyness of crude oil in my country are becoming more and more serious, which makes the content of aromatics and naphthenes in diesel processed and ...

AI Technical Summary

Problems solved by technology

This method uses a solvent to extract the catalytic cracking diesel oil. Since the catalytic cracking process determines that the catalytic cracking diesel oil contains a large amount of olefin compounds and sulfur and nitrogen compounds, it will inevitably lead to a large amount of extraction solvent and poor extraction effect.

The raffinate oil needs to be further hydrotreated, otherwise it will be difficult to meet the quality requirements of clean fuel, and the naphthenes in the oil that contribute less to the cetane number cannot be effectively utilized

[0008] Looking at the current processing methods of low-quality diesel oil, there are the following problems: (1) Some technologies focus on improving the quality of diesel oil, but fail to effectively utilize the aromatics and naphthenes in it, and the cetane number of diesel products is limited; (2) The existing technology of producing gasoline or aromatics from inferior diesel oil produces a large amount of cycloalkanes during the refining process of inferior diesel oil, and generates a large amount of gasoline components with low octane number in the further cracking process, and there are certain inconsistencies in the processing route Rationality; (3) The existing low-quality diesel lightening technology, when dealing with raw materials with high naphthenic content, the octane number and liquid yield of gasoline obtained are low