Modification method of heavy diesel oil
A diesel and heavy technology, applied in the petroleum industry, hydrocarbon oil treatment, hydrotreating process, etc., can solve the problems of large amount of solvent, high extraction temperature, poor separation effect, etc., to increase operational flexibility, low Effect of equipment investment and operating costs
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example 1
[0038] according to figure 1 The process of processing HLCO produces high cetane number diesel oil.
[0039] After mixing HLCO with hydrogen, it is sent to the hydrofinishing reactor for hydrofinishing, and then enters the hydrogenation upgrading reactor for hydrogenation upgrading. The effluent after the upgrading reaction undergoes gas-liquid separation, and the separated rich The hydrogen gas is recycled, and the liquid product is sent to the fractionation tower, and the separated fraction with a boiling point of less than 180°C is discharged from the system as a blending component of gasoline, and the fraction with a boiling point above 180°C enters the aromatics extraction unit, and is countercurrently liquidized with the extraction solvent. Liquid extraction, the aromatics extraction solvent is N, N-dimethylformamide (DMF), the raffinate oil is washed with water to obtain a diesel product, a rich solvent rich in aromatics, after removing the solvent, the obtained extract...
example 2
[0044] According to the method of example 1, HLCO is processed to produce high cetane number diesel oil. The difference is that water is added as a cosolvent in the extraction solvent, so that the extraction solvent contains 0.2% by mass of water, and the extraction solvent / extraction is controlled. The mass ratio of the raw material is 1.0, the operating conditions of the aromatics extraction unit are shown in Table 4, the composition of the extracted oil is shown in Table 5, and the properties of the obtained diesel product are shown in Table 6.
[0045] It can be seen from Table 5 that adding water to the extraction solvent can effectively reduce the content of non-aromatics in the extracted oil.
[0046] It can be seen from Table 6 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. Compared with the HLCO feedstock, the...
example 3
[0048] According to the method of Example 1, HLCO is processed to produce high cetane number diesel oil, the difference is that the extraction solvent used is N, N-dimethylacetamide (DMAC), and water is added as a cosolvent in the extraction solvent , so that the extraction solvent contains 0.4% by mass of water, the mass ratio of the control extraction solvent / extraction raw material is 0.8, the operating conditions of the aromatics extraction unit are shown in Table 4, and the composition of the extracted oil is shown in Table 5. The obtained diesel oil product The properties are shown in Table 6.
[0049] It can be seen from Table 6 that the cetane number of the obtained diesel product is 52.1, the sulfur content is less than 10 μg / g, and the content of condensed ring aromatics is 2.6% by mass, which is a qualified clean diesel product. Compared with the HLCO feedstock, the cetane number increased by 34.5 units.
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