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Catalytic conversion reactor for heavy oil and method for preparing propylene through catalytic cracking of heavy oil

A conversion reactor and heavy oil catalysis technology, applied in chemical instruments and methods, catalytic cracking, hydrocarbon cracking, hydrocarbon production, etc., can solve the problem of catalyst density reduction and propylene

Active Publication Date: 2022-01-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the volume increase process and existing problems in the process of converting heavy oil into propylene, in order to solve the impact of catalyst density decrease caused by the increase of reactant volume in bed catalyst density, when the reaction ends The second conversion of propylene is caused by the gas residence time, so as to achieve the purpose of improving the yield of propylene and the utilization efficiency of water vapor, and reducing the operating cost of the device

Method used

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  • Catalytic conversion reactor for heavy oil and method for preparing propylene through catalytic cracking of heavy oil
  • Catalytic conversion reactor for heavy oil and method for preparing propylene through catalytic cracking of heavy oil
  • Catalytic conversion reactor for heavy oil and method for preparing propylene through catalytic cracking of heavy oil

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Experimental program
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Effect test

Embodiment 1

[0129] Example 1 shows that the second reaction zone of the present invention adopts a structure containing a diameter-expanding section, which is beneficial to the production of propylene by catalytic cracking of heavy oil.

[0130] The reactor uses figure 1 The reactor structure shown. The first reaction zone and the third reaction zone are riser structures, the diameter of the first reaction zone is 1.2m, and the height-diameter ratio is 6.7; the pipe diameter of the third reaction zone is 0.8m, and the height-diameter ratio is 20; the first reaction zone The ratio of the diameter of the catalyst pre-lifting section of the zone and the third reaction zone to the diameter of the equal-diameter section of the riser is 1.3, and there are 6 nozzles.

[0131] The second reaction zone B is formed by an enlarged diameter section 15 and an equal-diameter cylinder 13 above. The structural size is that the diameter of the cylinder 13 is 4.2 m and the height is 1 m, and the diameter ...

Embodiment 2

[0142] Example 2 is used to illustrate that feeding a chiller into the transfer pipe after the reaction helps reduce the secondary conversion of propylene.

[0143] Embodiment 2 reactor adopts figure 1 The reactor structure shown differs from the reactor in Example 1 in that: a chiller feed distributor is provided in the inlet section of the delivery pipe 19 to connect with the chiller feed for feeding the chiller. The product of heavy oil cracking—gasoline fraction is used as the chiller, and the temperature at the outlet of feed pipe 19 is controlled to be 530°C. The bed temperature in the stripping zone is controlled at 520°C.

[0144] The product distribution is listed in Table 2.

Embodiment 3

[0146] Example 3 is used to illustrate the reactor structure type in which the second reaction zone adopts multiple diameter-expanding sections.

[0147] Embodiment 3 reactor adopts figure 2 In the reactor structure shown, the total height of the second reaction zone remains unchanged, and the original diameter-expanding section is changed into two diameter-expanding sections, and the expansion angles a and b of the two diameter-expanding sections are 16° to 13°, respectively.

[0148] Other structural parameters and operating conditions are the same as in Example 1.

[0149] The product distribution is listed in Table 2.

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Abstract

The invention discloses a catalytic conversion reactor for heavy oil and a method for preparing propylene through catalytic cracking of heavy oil. The reactor comprises reaction zones, a gas-solid separation zone and a steam stripping zone, wherein a first reaction zone is located below a second reaction zone and is opened at the bottom of the second reaction zone, a third reaction zone is arranged in parallel with the first reaction zone and the second reaction zone, an opening of the third reaction zone is located in the second reaction zone, the steam stripping zone is positioned below the second reaction zone, the top of the steam stripping zone communicates with the second reaction zone, the top of the second reaction zone is opened in the gas-solid separation zone, the lower part of the gas-solid separation zone is a catalyst collecting zone, the bottom of the gas-solid separation zone communicates with the steam stripping zone through a catalyst collecting pipe, and the inner diameters of the second reaction zone and the gas-solid separation zone are greater than the inner diameter of the first reaction zone. The reactor is used for preparing propylene by catalytic cracking of heavy oil. The reactor, a device and the method for catalytic conversion of heavy oil in the invention have the advantages of low coke and dry gas yield of catalytic cracking, high propylene yield and low energy consumption.

Description

technical field [0001] The invention relates to the petroleum refining field of heavy oil processing, in particular to a catalytic conversion reactor and a heavy oil catalytic cracking method. Background technique [0002] Propylene is a widely used basic organic chemical raw material, mainly used in the production of polypropylene, cumene, acrylonitrile, acrylic acid, etc. At present, propylene mainly comes from ethylene cracking units in petrochemical plants, catalytic cracking units in oil refineries, propane dehydrogenation, methanol to olefins and other processes. Naphtha steam cracking contributes the largest amount of propylene, followed by catalytic cracking of heavy oil, and propane dehydrogenation is an emerging industry that is limited by raw materials. At present, domestic propylene production is difficult to meet market demand and needs to be imported. In addition, with the development of electric vehicles, the growth of the market's pursuit of motor gasoline ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J8/28C10G11/18B01J8/18B01J8/22C07C4/06C07C11/06
CPCB01J8/28B01J8/226B01J8/1809B01J8/1818B01J8/1836B01J8/1872C10G11/18C10G11/182C10G11/187C07C4/06B01J2208/00371C10G2400/20C07C11/06Y02P20/52
Inventor 朱丙田胡立峰朱振兴张同旺龚剑洪韩颖魏晓丽
Owner CHINA PETROLEUM & CHEM CORP
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