Is it true that the higher the catalyst activity of an AFCC device, the better?
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Catalyst activity determines the level of raw material conversion, and higher activity helps to increase the conversion rate. Do all devices need to maintain high activity, with higher being better?
High catalyst activity is beneficial for increasing the conversion rate, but it is not the case that the higher, the better. When the catalyst activity is too high, it can affect its catalytic selectivity, resulting in a decrease in gasoline products and an increase in undesirable products such as dry gas and coke. Each set of devices has an optimal control activity based on its efficiency; higher is not always better.
The activity of a catalytic cracking catalyst reflects its ability to accelerate the rate of catalytic cracking reactions. Although high activity is beneficial for increasing the conversion rate of heavy oil, exceeding a certain level leads to a deterioration in the product distribution, such as a rapid increase in the yields of dry gas and coke; therefore, it is not possible to simply increase the activity. As for what catalyst activity is most suitable for each set of devices, it is necessary to take into account various factors such as raw materials, catalysts, production methods, and operating conditions in order to make a decision.
The activity of the balanced catalyst in the AFCC unit is carefully controlled, generally remaining within a reasonable range of activity. The main objective is to achieve the highest possible overall yield with the lowest possible catalyst consumption; this represents a balance point that is adjusted by introducing fresh catalyst through small dosing amounts. The higher the activity of the catalyst, the worse the distribution of the desired products may be; for example, the yields of dry gas and coke can be very high, which is not desirable. Additionally, the high consumption of catalyst **increases processing costs**. Furthermore, the catalytic feedstock also typically determines whether the catalyst activity increases or decreases; processing catalytic feedstocks that are difficult to crack requires a higher activity of the balancing agent. All of these require determining, based on the actual production conditions, what level of activity for the balancing agent is beneficial.
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