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Method for reliving FCC dead catalyst

A waste catalyst and catalyst technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as yield limitation, and achieve micro-reactivity improvement, low coke yield, high liquefied gas and The effect of gasoline selectivity

Active Publication Date: 2008-07-16
QINGDAO HUICHENG PETROCHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the industrialized magnetic separation method has not fundamentally solved the problem of comprehensive utilization of FCC spent catalysts. Only the method of selecting the best physical process has limited the improvement of catalyst activity, and the yield is greatly limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Add 1 kg of FCC waste catalyst (from Qilu Petrochemical Shengli Oil Refinery) into a three-necked flask, add 8 liters of hydrochloric acid solution with a pH value of 1 under stirring conditions, and heat to 80°C;

[0017] (2) Add 5 liters of 0.05mol oxalic acid solution to the reaction system in step (1), and keep the reaction at 80° C. for 8 hours;

[0018] (3) After the reaction is finished and naturally cooled to room temperature, filter and wash the product until the pH of the filtrate is about 7; dry the washed product at 100°C for 24 hours to obtain the revived catalyst.

[0019] After testing, it was found that the specific surface area of ​​the catalyst changed from 106.8m 2 / g increased to 211.7m after resurrection 2 / g, pore volume from 0.125cm 3 / g increased to 0.189cm 3 / g, the V content decreased from 4202ppm to 2902ppm, the Ni decreased from 1982ppm to 1718ppm, and the microreaction activity increased from 60.7 to 75.3.

Embodiment 2

[0021] (1) Add 1 kg of spent catalyst into a three-necked flask, add 4 liters of sulfuric acid solution with a pH value of 5 under stirring conditions, and heat to 120° C.;

[0022] (2) 3 liters of tartaric acid solutions of 0.2mol were added in the reaction system in step (1), and the reaction was maintained at 120° C. for 4 hours;

[0023] (3) After the reaction is finished and naturally cooled to room temperature, filter and wash the product until the pH of the filtrate is about 7; dry the washed product at 400°C for 24 hours to obtain the revived catalyst.

[0024] The physical structure of the obtained catalyst after the resurrection, the specific surface area is changed from 106.8m before the resurrection 2 / g increased to 205.4m after resurrection 2 / g, pore volume from 0.125cm 3 / g increased to 0.181cm 3 / g, the V content decreased from 4202ppm to 2890ppm, the Ni decreased from 1982ppm to 1722ppm, and the microreaction activity increased from 60.7 to 76.2.

Embodiment 3

[0026] (1) Add 1 kg of spent catalyst into a three-necked flask, add 6 liters of nitric acid solution with a pH value of 3 under stirring conditions, and heat to 110° C.;

[0027] (2) Add 4 liters of 0.1mol citric acid solution to the reaction system in step (1), and keep the reaction at 110° C. for 6 hours;

[0028] (3) After the reaction is finished and naturally cooled to room temperature, filter and wash the product until the pH of the filtrate is about 7; dry the washed product at 300°C for 24 hours to obtain the revived catalyst.

[0029] After testing, it was found that the specific surface area of ​​the revived catalyst was 106.8m 2 / g increased to 224.7m after resurrection 2 / , pore volume from 0.125cm 3 / g increased to 0.195cm 3 / g, the V content decreased from 4202ppm to 2815ppm, the Ni decreased from 1982ppm to 1678ppm, and the microreaction activity increased from 60.7 to 78.4.

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PUM

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Abstract

The invention relates to a method to rehabilitate waste FCC (fluid catalytic cracking) catalyst, pertaining to recovery and resource regeneration field of waste catalyst. The invention reconstructs the frameword of catalyst through the synergistic effects of inorganic acid and organic acid, to construct developed micropores-mesoporous compound pore-channel structure system during the reconstruction process, and eliminates or passivates heavy metal of the waste catalyst, so as to dramatically increase the specific surface area of the rehabilitated catalyst; the eliminating rate of heavy metal can reach 30 percent, the micro reactor activity can be improved by more than 10 percent, and the invention has comparatively higher selectivity of liquefied gas and gasoline and lower yield ratio of coke.

Description

technical field [0001] The invention relates to a method for reviving a spent catalyst, which belongs to the field of waste treatment and application. Background technique [0002] Catalytic cracking is the most important secondary processing process in the oil refining industry. The global annual consumption of cracking catalysts is about 350,000 tons. With the increasingly heavy and inferior quality of raw materials, the amount of catalyst scrapped due to factors such as heavy metal deposition, wear and coking also shows an increasing trend. Especially in recent years, in order to increase the yield of light oil, various refineries have adopted heavy oil (residual oil or partial residual oil) catalytic cracking in large quantities. Due to the high content of harmful substances such as heavy metals and residual carbon in the residual oil, the proportion of catalyst scrap is significantly increased. However, most of these spent catalysts are discarded by underground burial...

Claims

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Application Information

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IPC IPC(8): B01J29/90B01J29/06
Inventor 刘欣梅张新功阎子峰
Owner QINGDAO HUICHENG PETROCHEM TECH
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