Method for improving heavy diesel oil quality
A high-quality, diesel technology, applied in the petroleum industry, hydrocarbon oil treatment, hydrotreating process, etc., can solve the problems of limited saturation capacity, large hydrogen consumption, increased equipment investment and operating costs, etc., to improve cetane number, The effect of increased operational flexibility, low equipment investment and operating costs
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example 1
[0041] according to figure 1 A method for upgrading heavy catalytic cracked diesel oil (HLCO).
[0042] After LCO is fractionated, the separated HLCO raw material first enters the reactor of hydrofining unit 1 for desulfurization, denitrogenation, and deolefination, and the oil produced by hydrofining enters aromatics extraction unit 2 for liquid-liquid extraction with the extraction solvent. The extraction solvent is N, N-dimethylformamide (DMF), and the raffinate oil is washed with water to obtain diesel products. The rich solvent rich in aromatics is recovered by solvent to obtain the extracted oil, which is sent to the hydrogenation upgrading unit The reactor is modified to saturate the condensed ring aromatics. The liquid product after the hydrogenation reforming reaction is sent to the fractionation tower, and the separated fraction below 180°C is discharged from the system as a gasoline blending component. The fraction above 180°C is combined with the addition The liqu...
example 2
[0047] Heavy catalytic cracking diesel oil (HLCO) is upgraded according to the method of Example 1, the difference is to change the operating conditions of aromatics extraction, add water in the extraction solvent as a cosolvent, so that the extraction solvent contains 0.2% by mass of Water, the mass ratio of extraction solvent / extraction raw material is 1.0.
[0048] The operating conditions of the extraction of aromatics are shown in Table 3, the properties of the raffinate obtained from the extraction, that is, the diesel product, are shown in Table 4, the composition of the extracted oil is shown in Table 5, and the composition of the fraction with a boiling point above 180°C of the hydromodified product is shown in Table 6 .
[0049] It can be seen from Table 4 that the cetane number of the obtained diesel product is 52.3, the sulfur content is less than 10 μg / g, and the content of condensed ring aromatics is 2.4% by mass, which is a qualified clean diesel product. Compa...
example 3
[0051] Heavy catalytic cracking diesel oil (HLCO) is upgraded according to the method of Example 1, the difference is that the operating conditions of the aromatics extraction unit are changed, N, N-dimethylacetamide (DMAC) is used as the extraction solvent, and in Water is added into the extraction solvent as a co-solvent, so that the extraction solvent contains 0.4% by mass of water, and the extraction solvent / extraction raw material mass ratio is 0.8.
[0052] The operating conditions of the extraction of aromatics are shown in Table 3, the properties of the raffinate obtained from the extraction, that is, the diesel product, are shown in Table 4, the composition of the extracted oil is shown in Table 5, and the composition of the fraction with a boiling point above 180°C of the hydromodified product is shown in Table 6 .
[0053] It can be seen from Table 4 that the cetane number of the obtained diesel product is 52.1, the sulfur content is less than 10 μg / g, and the conte...
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