A Catalyst Regeneration Method for Improving Catalyst Selectivity

Abstract

A catalyst regeneration method for improving catalyst selectivity. The spent catalyst is contacted with oxygen-containing gas and optional water vapor in the first fluidized bed, and a coke combustion reaction occurs, and the mixture of the obtained semi-regenerated catalyst and flue gas enters the second fluidized bed. In the fluidized bed regenerator, contact with water vapor and optional oxygen-containing gas to continue the coke combustion reaction, the regenerated catalyst enters the reactor, and the flue gas enters the flue gas energy recovery system through the cyclone separator. The activity distribution of the regenerated catalyst obtained by this method is more uniform and closer to the equilibrium activity of the catalyst. Under low temperature and long-term operating conditions, part of the heavy metals on the surface of the regenerated catalyst will be buried by the matrix, and the remaining part of the heavy metals will be passivated. When hydrocarbons When the catalytic cracking reaction is carried out on the regenerated catalyst, the yield of dry gas and coke will be significantly reduced.

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...

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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 soon as possible Level

In addition, when processing heavier raw oil, more metals are deposited on the catalyst, and the regeneration temperature is as high as about 700°C, which causes the influence of these metals deposited on the catalyst on the structure of the catalyst itself, thereby reducing the selectivity of the catalyst

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