I have questions regarding the initial startup of the hydrogenation unit; could I ask the experienced workers for advice? !
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The unit’s hydrogenation plant is under construction; sulfurized catalysts are being used – how can it be put into operation? (The raw material is aromatic oil.) After airtight sealing, hydrogen is circulated to raise the temperature to 150 degrees. Can oil be poured in now? (DC diesel for fuel supply). Is it after using diesel to run the large cycle of reaction and distillation in order to wet the catalyst? Can normal production be achieved by improving the use of aromatic oil to replace diesel?
There is simply no plan for starting work. The leader asked us to draft it first, and then he would make the changes (probably to test our skills;P)
For the sulfided catalyst, first complete the airtight sealing of the startup pump, then light the furnace – the temperature doesn’t need to be too high; it’s fine if it’s lower. After that, just feed in the oil
Thank you! One more question: do you mean that the new facility doesn’t require diesel to operate, and can raw materials be fed in directly?
Issues such as nitrogen purging after airtight sealing, whether the catalyst is in a sulfided or oxidized state at the time of leaving the factory, and whether pre-sulfidation is necessary are numerous; it is recommended to look for the relevant operating procedures on forums for further study.
Just use hot oil for drying; it will take 16 more hours
Yes, why use diesel? It’s sufficient to simply dry it in the gas phase and then cut the material
The sulfided catalysts in hydrogenation units are actually sulfur-supported types, rather than being completely metal sulfided catalysts. Oil is fed at 150 degrees (sulfidation oil); a small reaction cycle is used. After following the normal pre-sulfidation temperature rise curve, the normal feeding rate is gradually increased.