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Technology and system for catalytic cracking

A catalytic cracking and process technology, which is applied in the process and system field of catalytic cracking, can solve the problems of insignificant conversion rate of heavy oil and decrease of dry gas yield, so as to improve the conversion rate of heavy oil, slow down the yield of dry gas and coke , to promote the effect of cracking again

Active Publication Date: 2018-01-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method inhibits the reconversion reaction of light olefins after formation by injecting hydrogen-rich gas into the reactor to increase the yield of light olefins, especially propylene, but it is harmful to reducing the dry gas yield and increasing the conversion rate of heavy oil. The effect is not obvious

Method used

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  • Technology and system for catalytic cracking
  • Technology and system for catalytic cracking

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Experimental program
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Embodiment approach

[0058] A specific embodiment, the lower part of the riser reaction section is provided with a heavy raw material inlet, and the bottom of the first fluidized bed reactor 6 is provided with a first fluidized bed reaction system for feeding regenerated catalyst and light raw materials. The lower part of the pre-lift section 5 is provided with a regenerated catalyst inlet, and the regenerated catalyst inlet is in fluid communication with the riser reaction section and the first fluidized bed reactor inlet through the gap.

[0059] In order to facilitate the separation of products and the regeneration of the spent catalyst, the system also includes a settling section 3 above the second fluidized bed reactor 2 and a stripping section below the second fluidized bed reactor 2 4. The riser reactor 1 extends into the stripping section 4 and the dense-bed reactor 2 from below the stripping section 4, and the top outlet of the riser reactor 1 is located in the The lower part of the dense...

Embodiment 1

[0071] test in as figure 1It is carried out in the medium-sized catalytic cracking unit shown. The device includes a set of independent reaction regeneration system and riser reactor plus fluidized bed combination reactor. The inner diameter of the riser reaction zone is 16 mm and the length is 3200 mm. After the riser reaction zone, the second fluidized bed reaction is connected in series. The second fluidized bed reactor has a diameter (inner diameter) of 64 mm and a height of 600 mm. Used catalyzer is MMC-2 catalyzer, carries out the second catalytic cracking and the 3rd catalytic cracking to the raw material shown in table 1 successively, the 3rd product after cracking is separated with the 3rd standby catalyst, the 3rd standby catalyst enters stripping After stripping, it enters the regenerator for regeneration, and the regenerated regenerated catalyst returns to the pre-lift section of the riser for recycling; the third product is introduced into the product separation ...

Embodiment 2

[0075] With reference to Example 1, the difference is that the high-temperature catalyst in the catalyst buffer tank is imported into the second fluidized bed reactor through the catalyst pipeline to increase the reaction temperature of the second fluidized bed reactor, and its reaction operating conditions and reaction results are shown in the table 3 and Table 4.

[0076] It can be seen from Table 3 and Table 4 that an independent first fluidized bed reactor is set up in the pre-lifting section, and the high-temperature catalyst in the pre-lifting section is used to compensate for the endothermic heat in the reaction process, which can ensure a constant temperature in the entire reactor. The reaction environment improves the conversion rate of gasoline injected into the first fluidized bed reactor, and increases the yield of light olefins. The high-temperature first spent catalyst from the independent first fluidized bed reactor is lifted into the catalyst buffer tank, and t...

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Abstract

The invention discloses a technology and system for catalytic cracking. The technology for the catalytic cracking comprises the steps of feeding light raw oil into a first fluidized bed reactor (6) which is arranged in a pre-lift zone (5) for a first catalytic cracking reaction, and feeding heavy raw materials into a lift-pipe reaction zone and a second fluidized bed reactor (2) for a second catalytic cracking reaction and a third catalytic cracking reaction sequentially. According to the technology based on the system, the yield of propylene can be increased, and meanwhile the increase of theyields of dry gases and coke can be slowed down.

Description

technical field [0001] The invention relates to a process and system for catalytic cracking. Background technique [0002] Small molecule olefins such as ethylene, propylene and butene are the most basic raw materials for organic synthesis. At present, the main production process of small molecular olefins in the world is steam cracking process, but the high temperature cracking furnace is easy to coke, so this process basically uses light oil as raw material, such as natural gas, naphtha, light diesel oil, and hydrogenation can also be used Cracking tail oil is used as raw material. At present, the trend of heavy and inferior crude oil in my country is becoming more and more obvious, the yield of light oil such as naphtha is getting lower, and the contradiction between supply and demand of raw materials for steam cracking process and catalytic reforming process is becoming more and more serious. Since the mid-1980s, Sinopec Research Institute of Petroleum and Chemical Eng...

Claims

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Application Information

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IPC IPC(8): B01J8/26C07C4/06C07C11/04C07C11/06C07C11/08C10G11/18
Inventor 沙有鑫朱根权谢朝钢杨超成晓洁
Owner CHINA PETROLEUM & CHEM CORP
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