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A method and system for catalytic cracking using double risers

A catalytic cracking, double riser technology, applied in chemical instruments and methods, chemical/physical processes, hydrocarbon oil treatment, etc., can solve problems such as high hydrogen consumption and impact on conversion

Active Publication Date: 2021-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, not only the hydrogen consumption is high, but also the reaction of the hydrogenated cycle oil in the upstream zone will seriously affect the conversion of the downstream heavy oil

Method used

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  • A method and system for catalytic cracking using double risers
  • A method and system for catalytic cracking using double risers
  • A method and system for catalytic cracking using double risers

Examples

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Embodiment 1

[0055] This embodiment illustrates adopting the present invention figure 1 For the method provided, the specific process is as described above, the main riser reactor is an equal-diameter riser, and the main operating parameters of the catalytic cracking unit are shown in Table 3.

[0056] The light cycle oil enters the medium-sized hydrogenation reactor, and the test conditions of hydrogenation treatment are: hydrogen partial pressure 8.0 MPa, average bed reaction temperature 360 ​​° C, volume space velocity 0.5 hours -1 , hydrogen oil volume ratio 1100Nm 3 / m 3 .

[0057] The reaction product distribution, hydrogen consumption and gasoline octane number are shown in Table 4.

Embodiment 2

[0059] It is basically the same as in Example 1, except that the main riser reactor is a variable-diameter riser, and is provided with a pre-lift section, a reaction section, a diameter-expanding section and an outlet section successively from bottom to top, and the reaction conditions of the reaction section are: temperature The temperature is 500°C, the pressure (absolute pressure) is 0.25 MPa, the equilibrium catalyst activity is 64, the weight ratio of agent to oil is 6.1, the oil and gas residence time is 1.2 seconds, the weight ratio of water vapor to raw material is 0.06, and the circulation weight ratio of light cycle oil is 0.07, and the reaction conditions in the diameter expansion section are: the temperature is 490°C, and the oil-gas residence time is 5 seconds.

[0060] The conditions of the auxiliary riser reactor and the hydrogenation conditions are the same as in Example 1, and the reaction product distribution, hydrogen consumption and gasoline octane number ar...

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Abstract

The invention relates to a method for catalytic cracking by adopting double risers. The method comprises: spraying heavy raw material from a first nozzle into a main riser reactor to carry out a first catalytic cracking reaction to obtain a first reaction product and a first waiting The raw catalyst is sent out from the top opening of the main riser reactor; the catalytic cracking light cycle oil is sent into the hydrogenation reactor to contact with the hydrotreating catalyst and undergo hydrotreatment; the obtained hydrogenated light cycle oil is sent into the In the auxiliary riser reactor, contact with the second catalytic cracking catalyst and carry out the second catalytic cracking reaction; the second reaction product and the second spent catalyst are sent to the upper part of the main riser reactor to be mixed with the first reaction product and The first spent catalyst is sent together from the top opening of the main riser reactor. The method and system of the invention can optimize the reaction conditions of hydrogenated light cycle oil and heavy raw materials, and produce more high-octane gasoline.

Description

technical field [0001] The invention relates to a method and system for catalytic cracking using double risers. Background technique [0002] With the development of heavy crude oil and the rapid growth of market demand for light oil products, in my country, catalytic cracking technology, which is used to lighten heavy oil, has developed rapidly. However, a fact that must be faced is that the quality of catalytic cracking diesel oil (or light cycle oil) has always been relatively poor, with high density, high aromatic content, and low cetane number. Even through diesel hydro-upgrading technology, it is difficult to Meet increasingly stringent diesel specifications. How to solve the catalytic cracking light cycle oil is an increasingly serious problem. Another problem that exists at the same time is the long-term shortage of domestic finished gasoline, and catalytic cracking gasoline accounts for 80% of finished gasoline. Therefore, how to maximize the production of high-o...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G69/00B01J8/26
Inventor 李泽坤龚剑洪唐津莲袁起民
Owner CHINA PETROLEUM & CHEM CORP