Why is it necessary to increase the flow rate first before raising the temperature when starting up hydrogenation?
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Why is it necessary to increase the flow rate first before raising the temperature when starting up hydrogenation? Could you explain that to me?
It is to prevent system pressure fluctuations or even accidents caused by temperature increases; by increasing the volume first, the temperature can be raised gradually to the level required for the reaction, resulting in a more gentle operation
The hydrogenation reaction is an exothermic reaction; if the amount of reactant is increased first after raising the temperature, the increase in amount may cause the temperature to rise again, leading to uncontrolled temperatures and a risk of temperature spikes. Therefore, in hydrogenation operations, it is strictly required to raise the temperature first before increasing the amount of reactant.
The hydrogenation reaction is an exothermic reaction; increasing the feed rate can help to mitigate the rise in temperature and prevent the bed temperature from becoming too high
The third floor is the correct answer; there is a section in the operating procedures dedicated to explaining the reaction mechanism, which can be studied
Generally, a small amount of feed is added first; once stability is achieved, the temperature is adjusted, and then this process is repeated until the desired amount of feed has been reached. One thing to keep in mind is that when increasing the volume, it takes some time for the additional feed to reach the reactor; therefore, there’s no need to rush – take your time.