A combined method for deep desulfurization of diesel oil
A deep desulfurization and combined method technology, which is applied in the petroleum industry, hydrocarbon oil treatment, hydrotreating process, etc., can solve the problems of shortened operation period and thermodynamic equilibrium limitation, and achieves the reduction of device investment and operation cost, scale reduction, and reduction Effect of Diesel Yield Loss
Active Publication Date: 2014-10-15
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
[0005] Aiming at the problem that the production of ultra-low sulfur diesel oil by hydrofining is limited by thermodynamic balance and the operation period is shortened, the present invention provides a series process of hydrofining-oxidative desulfurization
Method used
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Embodiment 1~4
[0025] 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.
[0026] 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.
[0027] Table 1 Composition and main properties of catalysts used in the examples
[0028] 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
[0029] Table 2 Properties of raw oil
[0030] ...
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Abstract
The invention discloses a combination method for deep desulfurization of diesel oil. Fresh diesel feed enters the hydrogen mixing tank for hydrogen mixing, and the hydrogen-dissolved diesel enters the liquid phase hydrogenation reactor for refining reaction; the resulting refined effluent enters the high-temperature and low-pressure flash tank for flash evaporation to obtain liquid-phase heavy fractions; part of the heavy fractions Circulate back to the hydrogen mixing tank, and part of the heavy fraction is oxidatively desulfurized. After oxidative desulfurization, the heavy fraction is mixed with the light fraction obtained from flash distillation and separated to obtain diesel products. In the method of the present invention, the liquid-phase hydrogenation removes simple sulfides in the diesel feedstock under moderate conditions; after flashing, the circulating heavy fractions continue to undergo hydrodesulfurization, and the remaining heavy fractions are selectively oxidized and desulfurized , can realize deep desulfurization of diesel oil. The method of the invention fully utilizes the advantages of hydrogenation desulfurization and oxidation desulfurization, reduces device investment and operating costs, reduces energy consumption, and can meet the demand for deep desulfurization of diesel oil to produce clean diesel oil.
Description
technical field [0001] The invention relates to a method for processing hydrocarbons, in particular to a method for producing ultra-low sulfur diesel. Background technique [0002] 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 hydrodesulfurization reaction...
Claims
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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