Hydrogenation catalyst

Many precautions are mentioned, but in practice there are only two key points: one is temperature control, ensuring that the agent is discharged at low temperatures; operations can only be carried out once the catalyst bed temperature drops below 40°C； During the process, temperature rise is closely monitored; if a temperature increase occurs, the amount of nitrogen purge and dry ice used is increased accordingly based on the severity of the situation. When there is a serious threat to the safety of the equipment and personnel, softened water can be injected into the reactor. Second, isolate the air by connecting a temporary nitrogen hose to supply nitrogen into the reactor, ensuring that the nitrogen pressure remains slightly positive throughout the process. Additionally, ensure the unloaded catalyst is sealed when placed in barrels and transported away promptly.

The reactor also requires appropriate treatment: the removed internal components should be placed in an alkali solution promptly or sprayed with a prepared sodium carbonate solution, and the same should be done for the inner walls of the reactor.

In addition to the above measures, it is necessary to prevent the unloading speed from being too fast, as friction can generate static electricity that may lead to fires; fire-fighting equipment should be available nearby to extinguish any fires promptly

First, steam and an appropriate amount of air are used to carry out partial oxidative passivation of the deactivated catalyst, thereby burning off the sulfur deposits on the catalyst that are prone to self-ignition in air, and then the catalyst is removed. Otherwise, measures such as nitrogen protection should be taken.

First, steam and an appropriate amount of air are used to carry out partial oxidative passivation of the deactivated catalyst, thereby burning off the sulfur deposits on the catalyst that are prone to self-ignition in air, and then the catalyst is removed. Otherwise, measures such as nitrogen protection should be taken.

That is, to first carry out partial regeneration inside the regenerator, and then remove the agent? Could you share the specific process?

Yes, the passivation of the deactivated catalyst prior to catalyst removal is roughly equivalent to partial regeneration at a shallow depth within the reactor; for detailed procedures, refer to the relevant explanations in books such as the \"Operation Guide for Hydrocracking Units\" and \"Hydrocracking Processes and Engineering\".

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Nitrogen purging maintains a slight positive pressure; those that are unloaded should be sealed promptly, and watering should be done at high temperatures