Questions regarding wax oil hydrogenation
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Question: 1. What is the impact of circulating oil on the reactor temperature rise? What are the main components of circulating oil, and is it susceptible to hydrocracking? 2. After the unit was restarted after a short shutdown, the temperature at the bottom of the distillation tower failed to rise, and the mid-stage reflux level dropped to its lowest value; the results were not satisfactory, with the diesel quality still being on the low side. The device is used for wax oil hydrogenation, primarily to reduce wax content. Full cycle process. I would appreciate some advice from those who are more experienced. Thank you.
The main components of the circulating oil are as follows: P.70, O0, N28, A2; for reference only. In my opinion, it is relatively easy for the oil to crack – since the oil that has already gone through hydrogenation refining and hydrocracking in the full-cycle process is sent back for further cracking. Since a reaction occurs, there is inevitably a temperature rise. If the temperature of the distillation column doesn’t rise, you can increase the amount of stripping steam and check the feed temperature. Take a look at the circulating oil extraction again. Check the tower top pressure.
The circulating oil composition is mainly paraffin oil, resulting in a small temperature rise
The refining depth of circulating oil is very low, making cracking more difficult
Mainly because it has a high content of aromatic hydrocarbons
The bottom temperature of the tower is adjusted based on the outlet temperature of the reboiler
The amount of steam used for bottom stripping can be increased
I would like to ask what the alkaline nitrogen content is after the wax oil is hydrogenated in our plant