The impact of basic nitrogen on catalytic cracking units?
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The last edit to this post was made by zfy_80522 on 2010-4-25 at 14:29. 1. The impact of the raw materials used in catalytic devices on basic nitrogen is mainly reflected in the effect on catalyst activity, but what is the mechanism behind this? 2. What is an appropriate level of alkaline nitrogen in the catalytic feedstock, so as not to affect the catalyst and the yield of the liquid phase? Could the experts out there give some advice?
1. Basic nitrogen compounds adsorb onto the acidic sites of the catalyst, interacting with them and causing the catalyst to become temporarily inactive, thereby reducing its activity and selectivity. Furthermore, a large amount of nitrides remain in the liquid products of catalytic cracking, severely affecting the stability of these products; neutral nitrogen is present in the lower portion of gasoline and in the upper portion of diesel. The basic nitrogen adsorbed on the acidic sites is burned in the regenerator, restoring the catalyst’s activity. 2. As the alkaline nitrogen content in the feedstock increases, gasoline yield decreases and octane number drops, while diesel and slurry yields increase, along with an increase in dry gas and coking. 3. Generally, it should not be >0.1%
The person upstairs is truly an expert. For the raw materials used in our factory, samples are usually prepared first; when submitting those samples, they will inform us of the total nitrogen content and the alkaline nitrogen content. After all, an alkaline nitrogen level of <0.1% is a theoretical value; the quality of the raw materials used in our factory is not that good. Thank you