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Hydro-upgrading method for diesel distillate

A hydrogenation modification and fractionation technology, which is applied in refining to remove heteroatoms, etc., can solve the problems of limited increase in cetane number, difficult operation, complicated process, etc., to achieve large production flexibility, simple device process, The effect of increasing the yield

Active Publication Date: 2009-06-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to overcome the disadvantages of the conventional hydro-upgrading method of diesel oil fractions, such as complex process flow, difficult operation or limited cetane number increase range, to provide a simple process, low operation difficulty and cetane Hydrogenation upgrading method of diesel fraction with large value increase

Method used

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  • Hydro-upgrading method for diesel distillate

Examples

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Embodiment approach

[0040]According to a preferred embodiment of the present invention, the hydro-upgrading method of the diesel fraction can be carried out according to the method shown in FIG. 1 . As shown in Figure 1, the diesel oil fraction 1 with a total aromatics content of not less than 35% by weight passes through the raw oil pump 3, and after preheating, it is counted as 11 and mixed with hydrogen-rich gases 20 and 22 to enter the first reactor 5, and is sequentially mixed with the first reactor 5. The hydrorefining catalyst, the second hydrorefining catalyst and the hydrorefining catalyst are contacted to perform deep desulfurization, denitrogenation, dearomatization and cetane number improvement reactions to obtain the contacted product 12. The total amount of the contacted product is The aromatics content is below 35% by weight. The diesel fraction 2 with a total aromatics content lower than 35% by weight passes through the raw oil pump 4, counts as 13 after preheating, mixes with the...

Embodiment 1

[0045] This example is used to illustrate the diesel fraction hydro-upgrading method provided by the present invention.

[0046] The raw material oil C, which accounts for 54.5% by weight of the total feed, is contacted with hydrogen-rich gas (the hydrogen content is 80% by volume), and enters the first reactor after being preheated by the heating furnace, and is sequentially mixed with the first hydrotreating catalyst H (for the second 20% by volume of the second hydrorefining catalyst J in one reactor), the second hydrorefining catalyst J, and the hydrorefining catalyst M are contacted, and the volume ratio of the second hydrorefining catalyst J and the hydrorefining catalyst M is 4:1. The raw material oil A which accounts for 15.5% by weight of the total feed amount and the feed oil B which accounts for 30% by weight of the total feed amount are mixed and preheated through a heating furnace, and then mixed with the first reactor effluent and entered into the second reactor,...

Embodiment 2

[0048] This example is used to illustrate the diesel fraction hydro-upgrading method provided by the present invention.

[0049] The raw material oil C, which accounts for 75% by weight of the total feed amount, is contacted with hydrogen-rich gas (the hydrogen content is 60% by volume), and enters the first reactor after being preheated by the heating furnace, and is sequentially mixed with the first hydrotreating catalyst I (for the second 10% by volume of the second hydrorefining catalyst J of a reactor), the second hydrorefining catalyst K, and the hydrorefining catalyst N are contacted, and the volume ratio of the second hydrorefining catalyst K and the hydrorefining catalyst N is 2:1. Accounting for 25% by weight of the total feed amount, raw oil B and hydrogen-rich gas are mixed and preheated by a heating furnace, then mixed with the effluent of the first reactor and entered into the second reactor, and sequentially mixed with the first hydrotreating catalyst I (for the...

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Abstract

The invention discloses a hydro-upgrading method for diesel distillates, wherein, the method comprises the steps of: in the presence of a hydrorefining catalyst and a hydro-upgrading catalyst, facilitating the diesel distillates with the total aromatics content not less than 35 weight % to contact a hydrogen-rich gas in a first reactor, so that the products after the contact has the total aromatics content not less than 35 weight%; afterwards in the presence of the hydrorefining catalyst and in a second reactor, facilitating the obtained products to contact a mixture of the diesel distillates with the total aromatics content less than 35 weight%. The hydro-upgrading method for the diesel distillates provided by the invention improves the quality of the diesel products to a large extent while maintaining high diesel yield, namely, the diesel yield is 93-99 weight%.

Description

technical field [0001] The invention relates to a method for hydrogenation and upgrading of diesel fraction. Background technique [0002] As environmental protection requirements become higher and higher, countries have stricter requirements on the quality of diesel products. For automotive diesel, the indicators that have changed a lot in the new specifications are sulfur content and cetane number. In the emission standard equivalent to Euro IV that China will implement, it is required that the cetane number of diesel oil should not be less than 51, and the sulfur content should not be greater than 50 micrograms per gram. [0003] On the other hand, with the continuous rise of international crude oil prices, in order to reduce the purchase cost of domestic refineries, the crude oil used by domestic refineries is getting worse and worse, and the properties of secondary processed oils such as catalytic diesel and coking diesel are also getting worse. The main manifestation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G45/02
Inventor 蒋东红张毓莹胡志海王子文辛靖聂红
Owner CHINA PETROLEUM & CHEM CORP
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