The catalyst in the FDFCC catalytic unit has low activity

There are many reasons for low system activity. First, consider the properties of the feed oil to see if it has become heavier; analyze the activity of the equilibrium catalyst as well as the level of heavy metals, to determine whether there is heavy metal poisoning. Second, check the activity and stability of the fresh catalyst you are using. Third, check whether the steam in the reverse regeneration system contains water, as this can lead to the hydrothermal deactivation of the catalyst and a decrease in its activity. Fourth, check whether the unit consumption of the catalyst is normal?

Also, check the color of the catalyst or conduct carbon determination on your catalyst to see if the coking is proper……

Is it intentionally set low, or is it wax oil that has been used in the processing?

We have considered and ruled out all the points mentioned by Teacher Fei regarding desert off-road driving. Is it due to the small design of the unit, high actual processing volume, and large main air flow, which cause wear on the CAT? The specific surface area of the balancing agent remains relatively low (between 80 and 100).

How much is the activity? Additionally, an increase in running loss enhances catalyst activity, as the amount of fresh agent added increases accordingly. For metals, it is not only necessary to consider the degree of contamination by nickel and vanadium, but also elements such as calcium and iron, which can also form a film that covers the active centers.

First, adjust the feedstock to reduce its heavy metal content and decrease the amount of vacuum residue used in blending. A suitable processing scheme should be determined based on the properties of the feedstock; if the feedstock is not properly adjusted, the catalyst will become inactive very quickly regardless of any attempts to replace it. Secondly, select an appropriate passivator, and adjust the dosage accordingly based on the nickel and vanadium content in the raw materials. Purchase balancing agents; when their activity is low and the amount of catalyst metals suspended is high, replace them promptly. It is necessary to choose a suitable freshener that is resistant to metals and wear. We will use external catalysts for comparison purposes, to see if there are any issues with the sample preparation in your laboratory; we’ll also carry out calibration. The above are our general approaches; we can discuss the specific methods in more detail if you’re interested

The specific surface area of the balancing agents in the bed layer should be kept above 105. The reason for low catalyst activity is the destruction of the catalyst’s skeletal structure or the blockage of its pores; there are many reasons for this, as everyone has already mentioned. One more point to add: water vapor also has this effect. It is necessary to check whether the steam coming from the inclined tubes, sampling devices, and oil combustion nozzles is passing through orifice plates. Whether the cause can be found or not, it is necessary to remove the old agent and replace it with a new one. By looking at the specific surface area of the catalyst, it’s fine if it doesn’t reach 105 – 95 will do as well – and an increase in yield can be clearly observed.

Can the reason for the small specific surface area of the balancing agent be observed using an electron microscope? I would appreciate some guidance from experts.

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Low catalyst activity in FDFCC units is a common phenomenon, mainly due to a low specific surface area, which is related to the characteristics of the unit – dual lift pipes, severe wear on the nozzles, and increased hydrothermal deactivation. Special attention should be paid to whether the gasoline feed contains water. Additionally, the consumption per unit of output in FDFCC units is higher, requiring an increased amount of fresh agent to be added, as the steam-reaction feed does not factor into the calculations.