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Descending catalytic cracking reactor

A catalytic cracking and reactor technology, used in catalytic cracking, cracking, petroleum industry, etc., can solve the problems of low conversion rate of hydrocarbon oil raw materials, back-mixing equipment, coking tendency, etc., and achieve improved atomization effect and uniform particle size. , Overcome the serious effect of back mixing

Inactive Publication Date: 2004-12-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this catalyst inlet device can make the catalyst distribution in the downcomer relatively uniform, it cannot increase the catalyst concentration in the downcomer, so there is still the problem of low oil agent contact efficiency. low conversion rate
[0013] To sum up, the existing down-flow reactors have the problems of low oil agent contact efficiency, insufficient heavy oil conversion capacity or serious tendency of catalyst back-mixing and equipment coking to varying degrees. So far, the above problems can be properly solved, and the reaction Downward reactor with good performance has not been reported yet

Method used

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Examples

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Effect test

Embodiment 1

[0052] This example illustrates: the test results obtained under conventional catalytic cracking reaction conditions using the down-flow reactor provided by the present invention.

[0053] The structural form of the downcomer reactor used in this embodiment is as follows figure 1 shown.

[0054] The raw material oil used in the embodiment, the catalyst and the test procedure are all the same as in Comparative Example 1, and the main operating conditions, product distribution and main product properties are shown in Table 3.

[0055] As can be seen from Table 3, compared with the comparative example, the heavy oil content in the product of the embodiment has decreased by more than 10 percent, the light hydrocarbon yield has increased by more than 10 percent, the dry gas yield and the comparative example are basically the same, and the coke Although the absolute yield has risen, this is because more heavy oil is converted, if calculated by relative yield (dry gas yield / heavy o...

Embodiment 2

[0057] This embodiment illustrates: adopt the descending type reactor provided by the present invention to obtain under harsher reaction condition test result.

[0058] The structure of the down-flow reactor used in this example is shown in FIG. 7 .

[0059] The raw material oil used in the embodiment, the catalyst and the test procedure are all the same as in Comparative Example 2, and the main operating conditions, product distribution and main product properties are shown in Table 4.

[0060] As can be seen from Table 4, compared with the comparative example, the heavy oil content in the product of the embodiment has reduced by more than 8 percentage points, and the light hydrocarbon yield has increased by nearly 9 percentage points, while the dry gas yield and the coke yield and the relative The proportion is basically the same. The yield of propylene in the product increased by more than 3 percentage points. It can be seen that using the down-flow reactor provided by th...

Embodiment 3

[0062] This embodiment illustrates: adopt the descending type reactor provided by the present invention to obtain under the reaction condition of high severity test result.

[0063] The structure of the down-flow reactor used in this embodiment is as follows Figure 11 shown.

[0064] The raw material oil used in the embodiment, the catalyst and the test procedure are all the same as in Comparative Example 3, and the main operating conditions, product distribution and main product properties are shown in Table 5.

[0065] As can be seen from Table 5, compared with the comparative example, the heavy oil content in the product of the embodiment has decreased by more than 6 percentage points, the ethylene yield and the propylene yield have all increased by more than 3 percentage points, and the productive rate of coke has decreased by nearly 1 percentage point. It can be seen that using the down-flow reactor provided by the present invention to convert hydrocarbon oil raw mater...

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Abstract

A descending catalytic cracker consists of a regenerating agent duct, a top cover, raw material nozzles, an outer shell, a pre-lift medium distributor, a descending reacting pipe, and a catalyst pre-lift pipe, of which the upper opening is located in the outer shell and the lower portion is communicated with the regenerating agent duct. The pre-lift medium distributor is arranged at the bottom of the catalyst pre-lift pipe. The upper portion of the outer shell is closely connected with the periphery of the top cover. The descending reacting pipe is communicated with the outer shell at its sidewall or bottom, or through two symmetrically arranged bypass pipes. The raw material nozzles are arranged on the top cover and / or the upper portion of outer shell sidewall, above the upper opening of the catalyst pre-lift pipe.

Description

technical field [0001] The invention belongs to catalytic cracking equipment for petroleum hydrocarbons in the absence of hydrogen, more specifically, a downward catalytic cracking reactor. Background technique [0002] With the development of the economy, the demand for vehicle fuel and low-carbon olefins based on petroleum will continue to increase around the world. Due to limited oil resources, the development of deep processing of heavy oil and increasing the supply of light oil products and low-carbon olefins will still be a major development strategy for the oil refining industry in the 21st century. Catalytic cracking raw materials have wide adaptability and large conversion depth. While converting heavy raw materials into gasoline, diesel and other vehicle fuels, the liquefied gas generated contains more low-carbon olefins, which is the secondary processing of heavy oil. The most important craft. The catalytic cracking unit has a large scale and relatively small in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G11/00
Inventor 许克家侯栓弟龙军张久顺张占柱李松年何俊武雪峰朱丙田赵俊鹏
Owner CHINA PETROLEUM & CHEM CORP
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