Catalytic conversion method for improving cetane number and yield of diesel

A catalytic conversion method and a technology for cetane number, applied in the field of catalytic conversion, can solve the problems of not mentioning improvement of diesel properties, low cetane number of light diesel oil, etc., and achieve performance improvement, catalyst content reduction, and crushing tendency reduction. Effect

Active Publication Date: 2013-09-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN1900226A discloses a catalytic cracking co-catalyst and its preparation method for prolific diesel oil production. Adding a certain amount of the co-catalyst can increase the diesel yield of the FCC catalytic unit and improve Product distribution, but the method does not mention improvement in diesel properties
The disadvantage of this method is that the cetane number of light oil is low

Method used

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  • Catalytic conversion method for improving cetane number and yield of diesel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] This example illustrates the use of the method provided by the present invention for selective cracking reaction to produce high-quality diesel.

[0049] The flow chart of the medium-sized catalytic cracking unit is shown in the figure. The feed oil is injected into the reaction zone I of the riser reactor through the pipeline 3, and it contacts and reacts with the catalyst A raised by the steam in the lower part of the riser reactor, and reacts in the riser. The weight ratio of catalyst A and feedstock oil in the vessel is 3:1, the residence time of feedstock oil in the riser reactor is 1.6 seconds, and the reaction temperature is 450°C. The pressure of the gas collecting chamber is 0.2 MPa. After the oil and gas come out of the riser, they are separated by the cyclone separator and then enter the fractionation system at the rear. The spent catalyst with carbon enters the stripping section, the spent catalyst after the stripping goes to the regenerator for regeneration, a...

Embodiment 2

[0052] The test was carried out using the same riser reactor as in Example 1 above. The raw oil used was the same as that in the above example. The test steps and methods were exactly the same as in the example, except that the catalyst used was changed from the conventional particle size catalyst A of Example 1 to Coarse particle size catalyst B. The test conditions and test results are listed in Table 3, and the diesel properties are listed in Table 4.

[0053] It can be seen from Table 3 that the diesel yield of this embodiment is as high as 46.15 wt%; from Table 4, it can be seen that the diesel cetane number of this embodiment is as high as 52, and the diesel cetane number barrel is as high as 2399.8.

[0054] It can also be seen from Table 3 that the yield of dry gas and coke in this example is significantly lower than that in Example 1, indicating that the cracking catalyst B with coarse particle size can reduce the yield of dry gas and coke more than the cracking catalyst A...

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Abstract

The invention discloses a catalytic conversion method for improving cetane number and yield of diesel. Raw oil is contacted with a catalyst containing large pore zeolite in a catalytic conversion reactor for reaction, and the reaction temperature, oil gas retention period, and the weight ratio of the catalyst to the raw oil sufficiently ensure that a reaction product containing catalytic wax oil which is 12 to 60 weight percent of the raw oil is obtained in the reaction, wherein the reaction temperature is 420 to 550DEG C, the oil gas retention period is 0.1 to 5 seconds and the weight ratio of the catalyst to the raw oil is 1-10; and the catalytic wax oil enters a hydrogenation unit, and the obtained hydrogenated catalytic wax oil returns to the catalytic conversion reactor. By the method, the diesel with high cetane number is produced maximally, the cracking catalyst with coarse particle size distribution can further improve the selectivity of dry gas and coke, and the catalyst breaking tendency and the catalyst consumption are reduced.

Description

Technical field [0001] The present invention relates to a catalytic conversion method, more specifically, a method for maximizing the cetane number and yield of catalytically cracked diesel fuel through catalytic cracking and hydrogenation. Background technique [0002] The demand for high-quality diesel is increasing worldwide, while the demand for fuel oil is decreasing. Although the increase in demand for gasoline and diesel varies from region to region, the growth rate of demand for diesel worldwide will exceed the growth rate of demand for gasoline. Therefore, more low cetane catalytic cracking (FCC) light diesel oil is being used as a blending component of diesel. In order to meet the demand for high-quality diesel, it is necessary to upgrade the FCC light diesel, or directly produce a large amount of high-quality FCC light diesel through the FCC. [0003] In the prior art, methods for upgrading catalytic light diesel oil mainly include hydrotreating and alkylation. USP554...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G69/04
Inventor 程从礼许友好胡志海何鸣元陈昀马建国谢朝钢张久顺龚剑洪崔守业董建伟
Owner CHINA PETROLEUM & CHEM CORP
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