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Deep desulphurization dearomatization combination method of diesel oil

A combined method and deep desulfurization technology, which is applied in the petroleum industry, hydrocarbon oil treatment, hydrotreating process, etc., can solve problems such as shortened operation period and thermodynamic equilibrium limitation, and achieves mild operating conditions, large benefits, and deep dearomatization depth Effect

Active Publication Date: 2013-01-16
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0007] Aiming at the problem that the production of ultra-low sulfur diesel oil by hydrofining is limited by thermodynamic balance and the operation cycle is shortened, the present invention provides a series process of hydrofining-hydrogenation upgrading

Method used

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  • Deep desulphurization dearomatization combination method of diesel oil

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Embodiment 1~4

[0028] use figure 1 process shown. The compositions and properties of the hydrorefining catalysts and hydroupgrading catalysts used in the examples are shown in Table 1. The raw material properties used are shown in Table 2, and the process conditions used in Examples 1 to 4 are listed in Table 3. The evaluation results of Examples 1 to 4 are shown in Table 4.

[0029] Table 1 Composition and main properties of catalysts used in the examples

[0030] project Refined preparation modifier Chemical composition, mass% MoO 3 6.2 — NiO 12.3 14 COO — — WO 3 15.2 27.2 carrier Aluminum oxide Molecular sieve + alumina*

[0031] *Wherein Y molecular sieve content is 12wt%.

[0032] Table 2 Properties of raw oil

[0033] project Raw oil Density (20℃), g / cm 3 0.8632 Distillation range, ℃ 199～375 Sulfur content, μg / g 12000 Nitrogen content, μg / g 406 Aromatic content, wt% 38 ...

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Abstract

The invention discloses a deep desulphurization dearomatization combination method of diesel oil, comprising the following steps of: allowing fresh diesel oil feedstock to enter a hydrogen mixing pot, fully dissolving hydrogen, and entering a liquid phase hydrogenation reactor for refining reaction; allowing the obtained refined effluent to enter a high-temperature low-pressure flash evaporation pot for flash evaporation so as to obtain a liquid phase heavy fraction; allowing part of the heavy fraction to recycle and return to the hydrogen mixing pot and the other part of the heavy fraction to undergo hydrogenation modification, mixing the modified heavy fraction and the light fraction obtained by flash evaporation, and separating to obtain the diesel oil product. According to the method, liquid-phase hydrogenation is performed under mild conditions to remove simple sulfide in the diesel oil feedstock; after flash evaporation, the recycled heavy fraction continues to undergo hydrodesulfurization; and through hydrogenation modification, hardly-removed dibenzothiophene compounds and aromatic hydrocarbons in the heavy fraction are selectively removed. In comparison with a traditional technology, the method provided by the invention has advantages of deeper desulphurization and dearomatization and high yield of diesel oil. Under the same reaction depth, the operation condition is milder, which is beneficial to long-period running of equipment.

Description

[0001] technical field [0002] The invention relates to a hydrocarbon hydrotreating method, in particular to a method for deep hydrodesulfurization and dearomatization of diesel oil to produce ultra-low sulfur diesel oil. [0003] Background technique [0004] With the improvement of people's awareness of environmental protection and the increasingly stringent environmental regulations, the production and use of clean vehicle fuels has increasingly become a development trend. Hydrofining technology is still the main and most effective technical means in the production of clean diesel oil and the technology of improving the quality of diesel oil. But in the production of ultra-low sulfur diesel, the traditional hydrorefining technology also shows some shortcomings. The production of ultra-low-sulfur diesel mainly lies in the removal of dibenzothiophene compounds in diesel fractions, especially dibenzothiophene sulfides with substituents at positions 4 and 6. Due to the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G67/00
Inventor 柳伟丁贺刘继华李扬宋永一牛世坤李士才徐大海赵桂芳
Owner CHINA PETROLEUM & CHEM CORP
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