Was it correct that last time in our factory, gas was allowed to flow in before the catalyst had been fully vulcanized?
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1. Was it correct that last time in our factory, gas was allowed to flow in before the catalyst had been fully vulcanized? What are the harms?
If vulcanization is not done properly, it will affect the service life of the catalyst. If gas is allowed to pass through before complete vulcanization occurs, the catalyst will react vigorously, and since the internal heat cannot be dissipated in time, this can lead to overheating and sintering of the catalyst.
Is it possible to use process gas for sulfidation? We also used process gas for sulfidation during the initial startup of our system; virtually no CS2 was used in the design. Additionally, sulfidation using process gas is more complicated, and of course its disadvantages are obvious – it can accelerate pipeline corrosion :):).
Is it catalytic sulfidation of the transformation? There are indicators to analyze once vulcanization is complete; can it be considered complete just by saying so casually?
The direct effect of incomplete sulfidation is a decrease in catalyst activity and incomplete conversion reaction, which indirectly affects the catalyst’s lifespan； Incomplete sulfiding due to excessive gas introduction refers to the situation at the end of the sulfiding process, when the furnace temperature is high and the catalyst’s activity is relatively high; such conditions can easily lead to an overheating of the converter. It is also unreasonable to use syngas for sulfiding, as the composition of the gas produced by gasification is unstable, and a high water vapor content in the gas can result in incomplete sulfiding as well as difficulties in controlling the sulfiding time. Also, OPs, did you use CS2 for vulcanization before charging? Or should only nitrogen be circulated through the start-up heater for heating?