Catalyst regeneration method for improving selectivity of catalyst

A catalyst and selectivity technology, applied in catalyst regeneration/reactivation, catalytic cracking, molecular sieve catalysts, etc., can solve the problems of unfavorable catalyst activity, lower catalyst selectivity, high regeneration temperature, etc., and achieve uniform activity distribution and reduced impact , dry gas yield and coke yield reduction effect

Active Publication Date: 2010-10-06
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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  • Claims
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Problems solved by technology

[0007] However, when pursuing the selectivity of the target product, too high catalyst activity is not conducive to the improvement of the selectivity of the target product, especially the fresh catalyst itself has a high catalyst activity, how to reduce the fresh catalyst activity to the equilibrium catalyst activity as soo

Method used

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  • Catalyst regeneration method for improving selectivity of catalyst

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Embodiment

[0031] The embodiment is carried out on a medium-sized catalytic cracking unit, as shown in the accompanying drawing. According to the regeneration method proposed by the present invention, the catalyst is regenerated, the oxygen-containing gas is air, the apparent linear velocity of the gas in the first fluidized bed regenerator is 1.0 m / s, the average residence time of the catalyst is 1.5 minutes, and the regeneration temperature is 680°C ; The superficial linear velocity of the gas in the second fluidized bed regenerator is 0.3 m / s, the average residence time of the catalyst is 15 minutes, and the regeneration temperature is 650°C. The nickel content on the regenerated catalyst is 10000 μg / g, and the regenerated catalyst enters the reactor, contacts with the feed oil listed in Table 1, and carries out catalytic cracking reaction. The regeneration conditions, reaction conditions, regeneration results and reaction results are listed in Table 3.

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Abstract

The invention relates to a catalyst regeneration method for improving the selectivity of a catalyst. A catalyst to be regenerated is contacted with oxygen-containing gas in a first fluidized bed and generates a coke combustion reaction, the mixture of the obtained semi-regenerated catalyst and flue gas enters a second fluidized bed regenerator, is contacted with the optional oxygen-containing gas and generates the coke combustion reaction continuously, the regenerated catalyst enters a reactor, and the flue gas enters an energy recovery system of the flue gas by a cyclone separator. The distribution of the activity of the regenerated catalyst obtained by the method is more uniform, the activity of the regenerated catalyst obtained by the method more approaches to the equilibrium activity of a catalyst, part of heavy metal on the surface of the regenerated catalyst is buried by a substrate under the conditions of low temperature and long-time operation, and the rest part of the heavy metal is passivated. When hydrocarbon carries out a catalytic cracking reaction on the regenerated catalyst, the yields of dry gas and coke are obviously lowered.

Description

technical field [0001] The invention relates to a charred regeneration method of a carbon-containing catalyst in the catalytic cracking process of inferior oil. More specifically, the present invention relates to that in the process of catalytic cracking of inferior oil, a large amount of coke and metals are deposited on the catalyst, which seriously reduces the activity and selectivity of the catalyst, and must be regenerated through high-temperature oxidation to burn off most of the coke on the catalyst and to The metal activity on the catalyst is deactivated to restore the activity and selectivity of the catalyst. Background technique [0002] When low-quality oil undergoes catalytic cracking reaction, due to the existence of condensation reaction, in addition to generating light hydrocarbons, a part of coke is also generated, which is deposited on the catalyst, thereby reducing the activity and selectivity of the catalyst. Therefore, the high-temperature oxidation regen...

Claims

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Application Information

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IPC IPC(8): B01J38/34B01J38/04B01J29/04B01J29/90C10G11/05
Inventor 许友好崔守业张执刚鲁维民
Owner CHINA PETROLEUM & CHEM CORP
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