Deep desulphurization combination method of diesel oil

A technology of deep desulfurization and combination method, which is applied in the petroleum industry, hydrocarbon oil treatment, hydrotreating process, etc., can solve the problems of shortening operation period and thermodynamic equilibrium limitation, and achieves reduction of equipment investment and operation cost, scale reduction, and operation Condition favourable effect

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

[0008] Aiming at the problem that the production of ultra-low sulfur diesel oil by hydrofining is limited by thermodynamic balanc

Method used

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  • Deep desulphurization combination method of diesel oil

Examples

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Comparison scheme
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Embodiment 1~4

[0030] use figure 1 process shown. The composition and properties of the hydrotreating catalyst 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.

[0031]Oxidative desulfurization part: the catalyst adopts the C2-F catalyst in Example 10 of CN1769386A, the extractant is methanol, and the amount of methanol added is 10wt%. 2 o 2 The amount of aqueous solution added is 2 times of the theoretical requirement.

[0032] Table 1 Composition and main properties of catalysts used in the examples

[0033] project catalyst Chemical composition, mass% MoO 3 6.2 NiO 12.3 WO 3 15.2 carrier Aluminum oxide physical properties Pore ​​volume, mL / g 0.45 Specific surface area, m 2 / g 201

[0034] Table 2 Properties of raw oil

[0035]...

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Abstract

The invention discloses a deep desulphurization combination method of diesel oil, comprising the following steps of: allowing fresh diesel oil feedstock to enter a hydrogen mixing pot for hydrogen mixing, allowing diesel oil dissolved in hydrogen to enter a liquid phase hydrogenation reactor for refining reaction; allowing the obtained refined effluent to enter a high-temperature low-pressure flash tank 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 part of the heavy fraction to undergo oxidative desulfurization, mixing the heavy fraction which has undergone oxidative desulfurization 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 residual heavy fraction is selectively subjected to oxidative desulfurization so as to realize deep desulphurization of diesel oil. According to the method, by full utilization of advantages of hydrodesulfurization and oxidative desulfurization, equipment investment and operation cost are reduced, and energy consumption is minimized. Therefore, the method can satisfy the demand of producing clean diesel oil by deep desulphurization of diesel oil.

Description

[0001] technical field [0002] The invention relates to a method for processing hydrocarbons, in particular to a method for producing ultra-low sulfur diesel. [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 presence of substituents at the 4 and 6 positions, the hydrodesul...

Claims

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Application Information

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IPC IPC(8): C10G67/00
Inventor 柳伟李士才刘继华李扬宋永一牛世坤徐大海丁贺
Owner CHINA PETROLEUM & CHEM CORP
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