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Ultra-deep desulfurization and dearomatization method for diesel oil

A technology for deep desulfurization and dearomatization, which is used in the petroleum industry, processing hydrocarbon oil, refining to remove heteroatoms, etc. It can solve the difficulty of taking into account the dual requirements of ultra-deep desulfurization and aromatic saturation of oil products, unable to exert the advantages of catalysts, and unfavorable catalysts. Problems such as long-term stable operation

Active Publication Date: 2020-04-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in order to meet the requirements of ultra-deep desulfurization, the temperature of the upper catalyst must be higher than the conventional initial reaction temperature, which is not conducive to the long-term stable operation of the catalyst, and the hydrofining catalyst used in this patent is a single type of catalyst, which cannot play the role of various types of catalysts in different Advantages under regional conditions
[0011] Existing catalysts and process technologies cannot overcome the contradiction between dynamic and thermodynamic balance between ultra-deep desulfurization and aromatic hydrocarbon saturation, and it is difficult to take into account the dual requirements of ultra-deep desulfurization and aromatic hydrocarbon saturation

Method used

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  • Ultra-deep desulfurization and dearomatization method for diesel oil
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  • Ultra-deep desulfurization and dearomatization method for diesel oil

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Experimental program
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Embodiment 1

[0058] Prepare sodium aluminate with a concentration of 12wt%, add a certain amount of 25wt% tetrapropylammonium hydroxide after dissolving, stir evenly, and then add ethyl orthosilicate with the same volume ratio (relative to tetrapropylammonium hydroxide) , after stirring evenly, put it in a kettle, age at 100°C for 4 hours to obtain a clear solution, after cooling down to room temperature, add a certain amount of polydimethyldiallyl ammonium chloride, after stirring evenly, the feeding of each raw material molar ratio as Al 2 o 3 : Na 2 O : SiO 2 :TPAOH:BM:H 2 O counted as 1.0:1.0:20:8.5:0.25:1200. Crystallize the gel obtained above in an autoclave at 180°C for 2 days, take it out, wash it, dry it, and perform ion exchange. The temperature was 80°C, and the exchange was performed twice. After each ammonium exchange, the obtained samples were dried at 120°C for 6 h and calcined at 520°C for 4 h to finally obtain H-type mesoporous ZSM-5 molecular sieves. Molecular sieve...

Embodiment 2

[0065] Catalyst Grading Scheme

[0066]

Embodiment 3

[0068] Catalyst Grading Scheme

[0069]

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Abstract

The invention discloses an ultra-deep desulfurization and dearomatization method for diesel oil. The method comprises the following steps that under a hydrogenation reaction condition, raw oil sequentially passes through a region I, a region II, a region III and a region IV filled with a hydrogenation catalyst in a reactor from top to bottom, and is subjected to a hydrogenation reaction with the catalyst in each region and hydrogen from bottom to top, and a hydrogenation reaction product flows out from the bottom of the reactor, wherein the reaction temperatures of the region I, the region IIand the region III are gradually increased, and the reaction temperature of the region IV is 51-100 DEG C lower than the reaction temperature of the region III. According to the method, different catalysts are reasonably graded, process parameters corresponding to the catalysts are adjusted, and the method is used for the hydrogenation reaction of diesel oil and can meet the requirements for producing low-sulfur and low-aromatic hydrocarbon diesel oil.

Description

technical field [0001] The invention relates to a method for ultra-deep desulfurization and dearomatization of diesel oil. [0002] technical background [0003] With the increasingly stringent environmental regulations, the production and use of clean vehicle fuels has become a development trend. As for the cleanliness of diesel oil, desulfurization and dearomatization are the key and development trend of its cleanliness. The upcoming national VI diesel quality standard for vehicles stipulates that the sulfur content in oil products shall not exceed 10ppm, and the mass fraction of polycyclic aromatic hydrocarbons shall not exceed 7%. The production of ultra-low sulfur and ultra-low aromatics clean diesel oil is a major oil refining enterprise. important question. [0004] CN02133137.5 discloses a gas-liquid countercurrent hydrocarbon hydrotreating method, which is mainly characterized in that the hydrotreating reactor is loaded with different catalyst gradations. The bott...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G45/02
CPCC10G45/02C10G2300/1037C10G2300/202
Inventor 孙进郭蓉周勇杨成敏姚运海
Owner CHINA PETROLEUM & CHEM CORP
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