Catalytic conversion method for improving cetane number and yield of diesel

A catalytic conversion method and cetane number technology, applied in the field of catalytic conversion, can solve the problems of improving the properties of diesel oil and low cetane number of light diesel oil, etc., and achieve performance improvement, catalyst content reduction, and reduction of fragmentation tendency Effect

Active Publication Date: 2011-05-04
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
  • 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 situation of producing high-quality diesel oil by selective cracking reaction using the method provided by the present invention.

[0049] The flow chart of the medium-sized catalytic cracking unit is shown in the attached figure. The feedstock 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 lifted by water vapor at the lower part of the riser reactor, and reacts in the riser reactor. The weight ratio of catalyst A and raw oil in the reactor is 3:1, the residence time of raw oil in the riser reactor is 1.6 seconds, and the reaction temperature is 450°C. The pressure of the gas collection 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 rear fractionation system. The spent catalyst with carbon enters the stripping section, and the spent catalyst after stripping goes to the regenera...

Embodiment 2

[0052] Adopt the riser reactor identical with above-mentioned embodiment 1 to carry out test, used stock oil is identical with above-mentioned embodiment, test procedure and method are exactly the same as embodiment, just the catalyst that adopts is changed into by the conventional particle size catalyst A of embodiment 1 Coarse particle size catalyst B. The test conditions and test results are listed in Table 3, and the properties of diesel oil are listed in Table 4.

[0053] As can be seen from Table 3, the yield of diesel oil in this embodiment is as high as 46.15% by weight; as can be seen from Table 4, the cetane number of diesel oil in this embodiment is as high as 52, and the cetane number barrel of diesel oil is as high as 2399.8.

[0054] It can also be seen from Table 3 that the dry gas and coke yields of this embodiment are significantly lower than those in Example 1, indicating that the cracking catalyst B with a coarse particle size can reduce the dry gas and coke...

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

Claims

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Application Information

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Patent Type & Authority Applications(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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