Issues related to catalysis

Thread Content

I have only been working with catalysis for a month; I used to be involved in synthesis work, so I’m not very familiar with cracking. I have some questions and hope everyone can help me solve them. As I understand it, it is a dual lift-column reactor. 1. The relationship between reaction temperature and gasoline octane number. My understanding is that by increasing the reaction temperature, the olefin content in gasoline rises, thereby increasing its octane rating. 2. The relationship between conversion rate and gasoline octane rating. My understanding is that by increasing the conversion rate and the depth of reaction, the olefin content in gasoline rises, which in turn increases its octane rating. 3. Under the same operating conditions, increasing the temperature should mean raising the oil-to-agent ratio and deepening the reaction depth. 4. To achieve a higher yield of olefins, it is necessary to increase the reaction depth, which can be done by adjusting the reaction temperature, increasing the reagent-to-oil ratio, raising the feed temperature, and adding more atomizing steam. 5. The relationship between catalyst activity and gasoline octane number. My understanding is that the higher the catalyst activity, the higher the conversion rate under the same operating conditions, which should in turn increase the octane rating. 6. If the one-way conversion rate increases, it will inevitably lead to a decrease in the reprocessing ratio, which in turn results in an increase in the amounts of gasoline, dry gas, and coke. Therefore, the reaction depth can be observed through the re-refining ratio. My understanding is that a higher conversion rate necessarily implies increased depth. 7. Influence of sulfur content in raw materials. I’ve seen it said that sulfur content has a significant impact on octane rating. I wonder if it is because sulfur absorbs H during the reaction, ending the reaction process early, which results in a reduced degree of reaction and consequently a lower octane rating If that’s the case, would an increase in the nitrogen content of the raw materials also have an effect in this regard? 8. Raw materials with a high K value yield better amounts of olefins under the same operating conditions; as a result, the octane rating of gasoline also increases. 9. The heavier the raw material, the more atomizing steam is required, as well as a higher reaction temperature and feed temperature. The opposite is true for lighter raw materials. 10. Increasing the pre-lift steam volume should enable a better fluidization state, which is beneficial for the reaction. If we ignore the subsequent rich gas unit, does a higher pre-lift gas pressure result in less coke? 11. Coke is caused by the polymerization of certain components in a catalyst. If the hydrocarbons in the catalyst are completely removed in both the stripping section and the regeneration section, does an increase in coke content also indicate an increase in reaction depth? I hope some experts can help me answer these questions. If there are any mistakes in my views, I hope everyone will kindly point them out. Thank you all again.