Process for producing ultralow sulfur diesel fuels

A technology of ultra-low sulfur diesel oil and production method, which is applied in the petroleum industry, processing hydrocarbon oil, hydrotreating process, etc., to achieve the effects of high cetane number, reduced processing cost, and low hydrogen consumption in reaction chemistry

Active Publication Date: 2008-11-26
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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Problems solved by technology

However, this method can only obtain diesel p...

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  • Process for producing ultralow sulfur diesel fuels

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specific Embodiment approach

[0017] Through the above analysis and understanding of the advantages and disadvantages of the composition and distribution of sulfides, aromatics, hydrodesulfurization and hydrodearomatization, the specific embodiments of the present invention are:

[0018] (1) Straight-run normal third-line fraction and / or diesel heavy fraction are mixed with hydrogen and enter the first hydrogenation reaction zone, where hydrodesulfurization, hydrodenitrogenation, hydrodenitrogenation, PAH saturation and partial ring opening reactions. The reaction conditions are: reaction temperature 250-450°C, preferably 260-420°C, hydrogen partial pressure 1.0-12.0MPa, preferably 2.0-10.0MPa, liquid hourly volume space velocity 0.3-8.0h -1 , preferably 0.5~6.0h -1 , Hydrogen oil volume ratio 100~1500Nm 3 / m 3 , preferably 150-1000Nm 3 / m 3 .

[0019] (2) Straight-run normal second-line fraction and / or diesel light fraction are mixed with the reaction effluent of the first hydrogenation reaction zon...

Embodiment 1

[0042] Raw oil A is cut into light and heavy components at 300°C. The heavy fraction of diesel oil above 300°C is mixed with hydrogen and enters the first reaction zone, under the action of hydroreforming catalyst and hydrofinishing catalyst I (loading volume ratio is 4:6) to carry out the ring-opening cracking reaction of polycyclic aromatic hydrocarbons and hydrodesulfurization reaction; the reaction product enters the second hydrogenation reaction zone together with the light fraction of diesel oil less than 300°C, and undergoes deep hydrodesulfurization reaction under the action of hydrofining catalyst II, and the reaction product is cooled and separated After fractionation and fractionation, a small amount of naphtha fraction and high-quality diesel products are obtained.

[0043] The reaction conditions of the present embodiment are as shown in Table 2, and the main properties of the product are as shown in Table 3. As can be seen from Table 3, the sulfur content of the ...

Embodiment 2

[0045] The raw material oil C is mixed with hydrogen and enters the first hydrogenation reaction zone, and reacts under the action of the hydroupgrading catalyst and the hydrofinishing catalyst II (loading volume ratio is 3:7), and the reaction product is mixed with the raw material oil B Mix and enter the second hydrogenation reaction zone together, and react under the action of the hydrorefining catalyst II, and the reaction products are cooled, separated and fractionated to obtain naphtha fractions and high-quality diesel products.

[0046]The reaction conditions of the present embodiment are as shown in Table 2, and the main properties of the product are as shown in Table 3. As can be seen from Table 3, the sulfur content of the diesel product is 5 μg / g, the polycyclic aromatic hydrocarbon content is 1.8% by weight, cetane The index is 60, which is clean diesel meeting Euro IV emission standards, and the yield of diesel products is above 99.0% by weight.

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Abstract

The invention relates to a production method for ultra-low sulfur diesel oil; wherein, after mixed with hydrogen, straight-run atmosphere 3rd side cut distillate and (or) diesel oil heavy distillate enter(s) a first hydrogenation reaction zone and reacts under the action of hydro-upgrading catalyst and hydrofining catalyst; after mixed with the reaction effluent of the first hydrogenation reaction zone, straight-run atmosphere 2nd side cut distillate and (or) diesel oil light distillate enter(s) a second hydrogenation reaction zone and reacts under the action of the hydrofining catalyst; the reaction effluent of the second hydrogenation reaction zone is cooled, separated and distilled to obtain naphtha fraction and diesel products. The method provided by the invention can treat the diesel distillate with high sulfur, high nitrogen and high final boiling point, and under mild operating conditions, obtain clear diesel products with low content of sulfur and polycyclic aromatic hydrocarbons as well as high cetane number; meanwhile, the product quality can reach the indexes of the IV European emission standard.

Description

technical field [0001] The invention belongs to a method for refining hydrocarbon oil in the presence of hydrogen, more specifically, a hydrogenation method for producing ultra-low sulfur clean diesel oil. Background technique [0002] With the continuous improvement of environmental protection requirements, people's requirements for vehicle fuel specifications are also getting higher and higher. In the latest fuel specifications worldwide, strict controls are made on diesel indicators. Among them, there are more stringent requirements on the sulfur content of diesel than before. For example, the Euro III emission standard implemented in Europe since 2000 stipulates that the sulfur content of vehicle diesel should be less than 350 μg / g, while the Euro IV emission standard implemented in 2005 requires the sulfur content to be lowered to below 50 μg / g. In the implemented Euro V standard, the sulfur content is further reduced to below 10μg / g. At the same time, various standa...

Claims

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Application Information

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IPC IPC(8): C10G65/04
Inventor 王哲高晓冬陈若雷何宗付龙湘云刘学芬
Owner CHINA PETROLEUM & CHEM CORP
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