Hydrogenation unit shut down
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Why is it necessary to reduce the reactor inlet temperature to 60°C before shutting down the cyclohydrogen compressor when the hydrogenation unit is shut down? What happens if shutdown occurs at a higher temperature?
There is a concern that if the temperature does not drop in certain areas of the catalyst bed, those areas may overheat
In my opinion, there are two reasons: first, when the temperature is high, stopping the circulating hydrogen compressor results in insufficient hydrogen available for the catalyst reaction, which affects the quality of the product. Secondly, the exothermic reaction of the catalyst causes the hydrogen flow to stop suddenly; without any circulation, this can lead to explosions!
Personally, I believe that when the system retains a certain concentration of hydrogen, the catalyst will undergo exothermic reactions such as activation reactions at a certain temperature, which poses a certain level of danger