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Regeneration method of coking catalyst

A technology for catalysts and regenerated catalysts, applied in catalyst regeneration/reactivation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as high coke and dry gas yields, improve service life and efficiency, reduce Effect of floor space, reduction of coke and dry gas yield

Active Publication Date: 2017-10-20
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

For example, the highest activity recovery of the regenerated catalyst can be achieved during regeneration, but the regenerated catalyst may cause high coke and dry gas yields due to its high activity when participating in the reaction, which is undesirable

Method used

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  • Regeneration method of coking catalyst

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Effect test

Embodiment 1-2

[0055] Embodiment 1-2 is in such as figure 1 The device shown is carried out, the inner diameter of the riser regenerator is 10 cm, the length is 240 cm, the inner diameter of the dense bed buffer is 50 cm, and the length is 100 cm, and the metal sintered filter is arranged in the dense bed buffer Separation of regenerated catalyst and regenerated flue gas. According to the regeneration method of the present invention, the coked catalyst is rapidly regenerated, and pure oxygen gas is fed into the bottom and middle of the riser regenerator. The residence time of the catalyst in the riser regenerator is 8 seconds, and the average residence time of the catalyst in the dense bed buffer is 60 seconds. The regenerated catalyst enters the reactor, contacts with the raw material oil listed in Table 1, and performs catalytic cracking reaction. The specific regeneration conditions, reaction conditions and product yield are listed in Table 3.

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Abstract

The invention discloses a regeneration method of a coking catalyst. The method comprises the steps as follows: the coking catalyst is sent into a riser regenerator to be sequentially alternately contacted with at least one stream of oxygen-rich gas and at least one stream of oxygen-containing gas and regenerated, and a regenerated catalyst is obtained, wherein the oxygen volume content of the oxygen-rich gas is larger than 21vol%, and the oxygen-containing gas is selected from at least one of oxygen, air and flue gas; the regenerated catalyst is sent into a dense phase bed buffer for buffer treatment, and the dense phase bed buffer is led out. With the adoption of the method, the coking efficiency can be substantially improved, the catalytic cracking selection of the regenerated catalyst can be improved, and the size of the regenerator can be reduced in the same catalyst treatment quantity.

Description

technical field [0001] The invention relates to a method for regenerating a coked catalyst. Background technique [0002] The catalytic cracking reaction of heavy oil generates hydrogen-rich components such as liquefied gas and gasoline, and also generates a part of coke with relatively low hydrogen content. The deposition of coke on the catalyst greatly reduces the activity and selectivity of the catalyst. Using the high temperature oxidation regeneration method, the coke on the catalyst is removed by combustion to restore the activity and selectivity of the catalyst. This process is called catalyst regeneration. The conventional catalyst regeneration method is to inject air into the bubbling fluidized bed or turbulent fluidized bed and adopt a single-stage regeneration method for regeneration. In this fluidized bed with low linear velocity and full gas-solid back mixing, gas and The solid contact efficiency is low, and the regeneration speed of the catalyst is slow, whic...

Claims

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Application Information

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IPC IPC(8): B01J38/14B01J38/04B01J38/12B01J23/92
CPCB01J23/92B01J38/04B01J38/12B01J38/14
Inventor 王新张执刚许友好崔守业
Owner CHINA PETROLEUM & CHEM CORP
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