Pressure increase and decrease requirements for hydrogenation reactors
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Why do high-pressure reactors in hydrogenation units have requirements regarding the rate and temperature of pressure changes, while high-pressure vessels used for hydrogen media do not have such requirements?
Hydrogenation reactors generally operate at high temperatures, mainly to prevent splashing caused by too rapid an increase in the temperature of the reactants
You are referring to the situation after oil is introduced; before that, it is necessary to raise the temperature and dry the system, as well as control the speed, mainly to protect the reactor
This is because there is no requirement for a specific temperature without sulfur at startup in order to prevent the reduction of the catalyst inside the reactor, and the pressure requirement is due to the material of the reactor. Hydrogenation units are all thick-walled equipment; rapid temperature changes can generate stress, leading to leaks. There are no requirements for high-pressure vessels in a hydrogen medium because the temperature is not that high. In hydrogenation, the material of the hot high-value fractions and that of the reactor are the same. So there are such requirements as well.