What issues need to be considered when passivating nickel catalysts
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The reactor needs maintenance; it is equipped with a nickel catalyst and requires passivation. I’m not sure what aspects need to be taken into account during the passivation process.
For reactor maintenance, it’s sufficient to remove the catalyst. This is how our operating procedures are written; it’s here for your reference. Unloading is done to avoid contact with air and prevent the catalyst from catching fire on its own. 1. The reactor needs to be cooled to a certain temperature; I’m not sure what that temperature is for you. 2. After purging with nitrogen and confirming it is satisfactory, isolate the area using a blind plate. Prepare the tank and replace the air inside with nitrogen. 3. Keep nitrogen flowing at the top, open the discharge port flange, and install the discharge piping. 4. Open the slide valve on the discharge port to load into barrels. Once the bucket is full, cover it and seal it. The bucket lid should have a rubber gasket for sealing and moisture prevention. 5. When the catalyst stops flowing out of the reactor, purge the reactor from above with a large amount of water vapor; this will moisten the remaining catalyst, making it easier to handle. 6. An inert gas should be introduced inward when removing this material. The alumina-supported beads can be discharged through the manhole at the bottom. I’m not sure if it will help you, but let’s make progress together in the future. Let’s be friends.
The measure we took was to first pass air through the catalyst to deactivate it, introducing a mixture of air and nitrogen into the reactor while gradually increasing the proportion of air, paying attention to the temperature rise. Finally, it is discharged directly without nitrogen protection. During the air introduction process, the temperature never exceeded 60 degrees. Also, in response to the person in post 2: Did nothing happen that caused the catalyst to catch fire when you removed it? It seems that next time it will be possible to remove and install the catalyst under nitrogen protection.
3# You’re right; practice is the criterion for testing truth. It’s very dangerous to use nickel catalysts without ensuring they are fully passivated – safety must come first in everything