Catalyst regeneration method for improving selectivity of catalyst

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 and water vapor in a dense-phase fluidized bed regenerator, is regenerated under the conditions that the temperature is 550 to 750 DEG C, the mean detention time of the catalyst is 4 to 30 minutes and the weight ratio of the water vapor to the oxygen-containing gas is 0.002 to 0.2, preferably 0.005 to 0.1, and generates a coke combustion reaction, the regenerated catalyst enters a reactor, and 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...

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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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