Regarding the chlorine content in UOP reforming catalysts
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These past few days, the content of unreformed catalyst in our system has been quite high, being 0.5–0.6% higher than the normal level. On the other hand, the chlorine content after regeneration is within normal ranges. The amount of chlorine added has been increased slightly compared to before, but there isn’t a significant change. I suspect the following reasons could be responsible for this: 1. The reaction temperature hasn’t been able to rise recently; it’s very low (this seems to me to be the most likely cause, but there’s no theoretical basis for it). 2. The water content in the system is affecting things, and the online analyzers are not accurate. 3. Chlorine gradually accumulates in the circulating hydrogen. These are just my guesses; please point out any mistakes. I’m not sure what could cause such phenomena; anyone who can help analyze this from the perspective of reaction mechanisms would be greatly appreciated!
The chlorine injection should take place during regeneration. If there is an excess of raw chlorine and the amount of chlorine injected increases, then there should also be an excess of chlorine after regeneration – how can things be normal in that case?
1. The reaction temperature is inversely proportional to the chlorine content on the catalyst surface. 2. The HCL content in the reaction cycle gas is directly proportional to the chlorine content on the catalyst surface. 3. Whether the chlorine content in the feed has increased, whether there are issues with the analysis of the raw catalyst, and whether the HCL content in the cycle gas has increased
This post was last edited by libingtaoff8 on 2017-6-24 at 12:41. 1. Has there been any change in the catalyst circulation rate? 2. What is the required control index for the chlorine content in the catalyst to be used in LZ? 3. Check whether there are errors in the sampling analysis; take samples multiple times for analysis. Additionally, replace the sampling points several times to avoid dead zones that could lead to inaccurate sampling analysis. 4. Have there been any changes in the impurities in the raw materials, and do they meet the requirements for feeding? 5. Has there been any change in the hydrogen chloride content in the circulating hydrogen, and any change in its purity? 6. Temperature drop of the reactor.