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A catalytic cracking catalyst regeneration method and equipment

A regeneration equipment and catalytic cracking technology, which is applied in catalyst regeneration/reactivation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problem of poor fluidization effect, high price of platinum, To solve problems such as limited resources, achieve the effect of improving product distribution, achieving smooth operation, and promoting the complete combustion of CO

Active Publication Date: 2017-12-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] From the point of view of the existing technology, most of the traditional CO combustion aids use platinum as the active component. Platinum is expensive and has limited resources. Moreover, the other main disadvantage of the traditional noble metal-supported CO combustion aids is that the loaded noble metals are exposed to high temperature water vapor. It is easy to condense and deactivate, so it is necessary to continuously replenish new combustion accelerants; secondly, the carrier is mostly irregular powdery oxides, whose physical properties do not match the cracking catalyst, and the fluidization effect during use is not good, resulting in large losses
Setting a buffer zone or turbulent zone or adding fresh air can alleviate the dilute-phase overheating to a certain extent, but it cannot fundamentally solve the problem of dilute-phase overheating

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  • A catalytic cracking catalyst regeneration method and equipment
  • A catalytic cracking catalyst regeneration method and equipment
  • A catalytic cracking catalyst regeneration method and equipment

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Embodiment approach

[0026] According to another embodiment of the present invention, the catalytic cracking catalyst regeneration method further includes: before performing coke regeneration on the spent catalyst and oxygen-containing gas, pre-processing the spent catalyst with a second methanol stream combustion. In this embodiment, a pre-combustion zone is also set in the catalyst dense-phase bed of the regeneration equipment, which is used to pre-combust the spent catalyst and methanol, and then enter the catalyst dense-phase bed for coke regeneration. With this implementation mode, the coke deposits on the ungenerated catalyst and a small amount of methanol are pre-combusted, which can alleviate the local overheating phenomenon caused by the coke entering the regeneration equipment for combustion.

[0027] In the method provided by the present invention, the linear velocity of the catalyst dense bed may be 0.5-2m / s, preferably 0.8-1.5m / s.

[0028] In the method provided by the present invent...

Embodiment 1

[0056] This example is used to illustrate the effect of the catalytic cracking catalyst regeneration method and equipment provided by the present invention.

[0057] Using vacuum residue as raw material, the catalytic cracking catalyst is MLC-500, and the test is carried out on a medium-sized riser reactor. The height of the riser reactor is 5 meters, and the inner diameter of the tube is 22 mm. The structure of the regenerative equipment is as figure 1 As shown, the spent catalyst enters the top of the catalyst dense-phase area of ​​the catalyst regeneration equipment through the inclined pipe 3 of the spent catalyst, and burns in contact with the oxygen-containing gas from the main air distributor 5, and the burnt catalyst recovers its activity. The regenerant inclined tube 4 is recycled in the riser reactor. The CO-containing gas generated by coke combustion moves upward into the catalyst dilute phase zone 2 of the regeneration equipment, and contacts with methanol from th...

Embodiment 2

[0059] This example is used to illustrate the effect of the catalytic cracking catalyst regeneration method and equipment provided by the present invention.

[0060] Using vacuum residue as raw material, the catalytic cracking catalyst is MLC-500, and the test is carried out on a medium-sized riser reactor. The height of the riser reactor is 5 meters, and the inner diameter of the tube is 22 mm. The structure of the regenerative equipment is as figure 2 As shown, the standby catalyst enters the standby sleeve 11 from the standby agent inclined tube 3, and after contacting with methanol from the methanol distributor 12 for pre-combustion, it turns back and enters the catalyst dense phase zone 1 of the catalyst regeneration equipment, and is connected with the main air The oxygen-containing gas from the sparger 5 is contacted and burned, and the catalyst to be regenerated is burnt to recover its activity, and the high-temperature regenerated catalyst is sent to the riser reacto...

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Abstract

The invention relates to a catalytic cracking catalyst regeneration method and a catalytic cracking catalyst regeneration device. The method comprises the following steps: (1) a spent catalyst is introduced into a regeneration device, such that the spent catalyst contacts an oxygen-containing gas in a catalyst dense phase bed layer in the regeneration device; coke-burning regeneration is carried out; gas produced after coke burning contacts a first methanol flow in a catalyst dilute phase bed layer in the regeneration device, and combustion is continued. The regeneration device comprises a housing, and a main air distributor and a first methanol distributor arranged in the housing. The inner space of the housing is divided into a catalyst dense phase zone positioned in the lower part and a catalyst dilute phase zone positioned in the upper part. The main air distributor is positioned in the catalyst dense phase zone. The first methanol distributor is positioned in the catalysts dilute phase zone. With the method provided by the invention, catalyst dilute phase bed layer temperature of the regeneration device can be substantially reduced, such that regeneration device stable operation can be realized, and catalytic cracking process production distribution can be improved.

Description

technical field [0001] The invention relates to a catalytic cracking catalyst regeneration method and catalytic cracking catalyst regeneration equipment. Background technique [0002] Catalytic cracking is the most important processing technology for lightening heavy oil in refineries. During the catalytic cracking process, heavy oil is cracked into gas and light hydrocarbons on the surface of the catalyst, and at the same time, carbon deposits appear on the surface of the catalyst, which leads to a significant decline in activity. In order to restore the cracking activity of the catalyst and provide the required heat, the coke-deposited catalyst is sent to the regeneration equipment after the reaction to burn off the coke attached to the catalyst and restore the activity of the catalyst. Coke combustion will release a large amount of CO 2 and CO. A large number of industrial data show that the dilute phase space for regeneration is very large, and the residence time of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J38/12B01J38/20B01J23/92
Inventor 魏晓丽陈学峰袁起民
Owner CHINA PETROLEUM & CHEM CORP