A beginner is asking a few questions about hydrocracking, mainly regarding some key temperatures
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When the system is airtight and the temperature of the reaction system is below 135°C (based on the lowest temperature in each bed layer), the system pressure must not exceed 4.25 MPa. When drying the catalyst, hydrogen can be introduced into the system only when the temperature at the highest point of the reactor beds is below 150°C. Why are these two temperatures specified? Is it to prevent hydrogen embrittlement? What about the second temperature? I’m not quite familiar with hydrocracking yet
135℃ is related to the reactor material. There have been similar discussions on the forum at http://bbs.hcbbs.com/thread-319990-1-1.html~~~
The second temperature prevents catalyst reduction, which is also why it is necessary to ensure that the recycle hydrogen contains hydrogen sulfide during normal production
However, the hydrogen temperature generally depends on the catalyst’s technical specifications.