Hydrogenation method for improving cetane number of secondary processing diesel oil

A technology for secondary processing of diesel oil and cetane number. It is applied in the fields of hydrocarbon oil cracking and petroleum industry. It can solve the problems of affecting catalyst strength and activity stability, affecting device operation cycle, and increasing operating costs. It achieves equipment investment and Low operating cost, low sulfur content, impact reduction effect

Active Publication Date: 2010-06-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

increase operating costs
At the same time, since a large amount of water is generated after hydrogenation of vegetable oil, for conventional hydrogenation catalysts, too high water content will affect the strength and activity stability of the catalyst, thereby affecting the operation cycle of the device

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0016] By the above analysis and understanding of diesel oil cut hydrocarbon composition and cetane number and composition, the specific implementation mode of the present invention is:

[0017] The low-quality secondary processed diesel oil is mixed with a certain amount of vegetable oil and / or animal fat as raw material, and in the presence of hydrogen, it is contacted with a hydrorefining catalyst to obtain a diesel product with an increased cetane number.

[0018] The hydrofining reaction conditions are: average reaction temperature 300-450°C, preferably 330-380°C; hydrogen partial pressure 3.2-8.0MPa, preferably 4.0-6.4MPa; volumetric space velocity 2.1-6h -1 , preferably 2.1~4.0h -1 ;Hydrogen oil volume ratio 300~800Nm 3 / m 3 , preferably 400-600Nm 3 / m 3 .

[0019] The hydrogenated product enters the high-pressure separator and the low-pressure separator in turn for gas-liquid separation, and the separated hydrogen-rich gas is boosted by the circulating hydrogen co...

Embodiment 1

[0035] The raw material oil A is contacted with the hydrofinishing catalyst to react under the conditions of hydrofinishing. After the reaction product is cooled and separated, the hydrogen-rich gas obtained is the circulating hydrogen, and the obtained liquid phase fraction enters the fractionation system to obtain a small amount of Naphtha fraction and premium diesel fraction. A hydroprotecting agent is loaded upstream of the hydrofinishing catalyst, and the loading volume ratio of the hydrotreating agent to the hydrofinishing catalyst is 1:9. The reaction conditions of this embodiment are shown in Table 2, and the main properties of the diesel product are shown in Table 3 after the above process has been continuously operated for 1000 hours. It can be seen from Table 3 that the sulfur content of the diesel product is 50 μg / g, the cetane number is 38.4, which is 13.9 units higher than that of the raw material, and the yield of the diesel product can reach more than 98% by we...

Embodiment 2

[0037] The raw material oil B and hydrogen pass through two reaction zones successively, contact with the hydrofinishing catalyst and the hydroupgrading catalyst in turn, and carry out the hydrofinishing and selective ring-opening cracking reactions respectively, and the hydrofinishing catalyst and the hydroupgrading catalyst The filling volume ratio is 8:2. After the reaction product is cooled, the hydrogen-rich gas obtained is circulating hydrogen. The obtained liquid phase fraction enters the fractionation system and is cut into naphtha fraction and high-quality diesel fraction. The reaction conditions of this embodiment are shown in Table 2, and the main properties of the diesel product are shown in Table 3 after the above process has been continuously operated for 1000 hours. It can be seen from Table 3 that the sulfur content of diesel products is 22 μg / g, meeting Euro IV emission standards. The cetane number of the diesel product reaches 42.6, which is 15.7 units higher...

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Abstract

The invention relates to a hydrogenation method for improving the cetane number of secondary processing diesel oil, which comprises the following steps: mixing secondary processing diesel oil and vegetable oil and/or animal fat; carrying out hydrogenation reaction by mixed ingredients and hydrogenation refining catalysts through contact in the existence of hydrogen; and cooling, separating and fractionating reaction outflow materials to obtain diesel oil products with mixed ingredients as the reference. The method provided by the invention can process low-quality diesel oil distillate with high sulfur content, high nitrogen content and small cetane number. The clean diesel oil products with low sulfur content, high polycyclic aromatic hydrocarbon and large cetane number can be obtained. Because the addition proportion of the vegetable oil is controlled, the influence on the hydrogenation catalysts by water generated in the reaction is reduced, the device operation period is prolonged, and in addition, the yield of obtained diesel oil products is high.

Description

technical field [0001] The invention belongs to a method for refining hydrocarbon oil in the presence of hydrogen, in particular to a hydrogenation method for improving the cetane number of secondary processed diesel oil. Background technique [0002] With the continuous improvement of environmental protection requirements, people have higher and higher requirements for vehicle fuel specifications. In the latest fuel specifications worldwide, strict controls are made on diesel indicators. The main reason is that there are stricter restrictions on the sulfur content of diesel products. For example, the Euro III emission standard implemented in Europe since 2000 stipulates that the sulfur content of diesel for vehicles shall be less than 350 μg / g, while the sulfur content requirement in the Euro IV emission standard implemented in 2005 is lowered to below 50 μg / g. In the Euro V standard implemented in 2010, the sulfur content was further reduced to below 10μg / g. At the same...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G47/00C10G47/02
Inventor 高晓冬王哲陈若雷孟祥堃郭群刘学芬
Owner CHINA PETROLEUM & CHEM CORP
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