Regarding catalyst replacement

The last edit to this post was made by dpclove21 on 2017-9-22 at 21:57. When loading the catalyst, it is necessary to measure the pressure drop in the empty tubes; the catalyst should be screened first, and loading should be carried out in batches. After each batch is loaded, the pressure drop and the loading height must be measured. Meanwhile, the catalyst should be tapped with a stick during loading to ensure uniform weight, height, and pressure drop. Records must be kept, and care should be taken to avoid carrying out the loading work in rainy weather

Here’s a suggestion: you can hire professional loading teams; if there are problems with the catalyst, they will be held accountable to you.

For catalysts, it’s best to hire professional teams; there are many such teams in Zibo. The equipment is of high quality and the personnel are highly skilled; both dilute-phase loading and dense-phase loading are no problem. I can give you my contact information if you need it.

Filling the catalyst is dangerous; nowadays specialized filling teams are used, so it’s recommended to find one.

It is recommended to use a professional filling team.

All precautions regarding catalyst loading should be described in detail in the catalyst’s instruction manual; you can consult the manufacturer or request the manual； The function of hydrogenation catalyst deactivation is to convert the sulfided active components on the catalyst surface into their oxidized form, in order to prevent spontaneous combustion upon exposure to air during shutdown. The oxygen content during the passivation process must be analyzed accurately. (This is my understanding.) I’d like to ask gently: which factory do you belong to?

Some manufacturers fill it themselves in order to save on filling costs, but all safety measures must be properly in place. The precautions for loading are also described in detail in the catalyst’s instruction manual.

Catalyst loading considerations: 1. A complete loading plan (including the calculated total amount of ceramic balls and catalyst). 2. Appropriate loading tools and protective measures for workers (to prevent damage to the catalyst). 3. It is essential to ensure even distribution during loading (to avoid uneven flow due to irregularities). Shutdown and passivation of hydrogenation catalysts: Purpose: To gradually oxidize ferrous sulfide inside the hydrogenation reactor, thereby preventing the natural reformation of ferrous sulfide once the reactor is opened； Precautions: During the passivation process, strict control is required over the oxygen content behind the hydrogenation reactor; real-time analysis must be carried out, and the oxygen content should be increased gradually depending on the temperature in the hydrogenation reactor. Once the temperature is under control, the oxygen content behind the hydrogenation reactor can be raised to 21%

Load the catalyst and hire qualified personnel; this will prevent uneven temperature rises or different reaction outcomes in various areas. It’s similar to pre-sulfurization, just with the process reversed: first adjust the circulation rate, replace it with nitrogen, and after the tests show satisfactory results, ensure that the system pressure is around 10 kPa. First, check the circulation rate of your system – it must not be lower than the minimum designed value. Then, calculate the oxygen supply amount as a percentage of the circulation rate; at the initial stage, this should not exceed 1%, with the amount gradually increased thereafter. Take out the pre-sulfurization plan provided by the catalyst manufacturer to you – it’s the same plan, only with oxygen used instead. Put it this way, it should be easy to understand.

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