I’m going to carry out dry sulfiding of the hydrogenation catalyst tomorrow
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The newly installed unit lacks prior experience in this area; it uses gasoline hydrogenation catalysts from Axens in France. What are the key things to pay attention to during sulfidation? I hope experienced experts can help analyze this
In case of sudden temperature rise, the hydrogen circulation unit shuts down, the new hydrogen unit also shuts down; preparations must be made in advance even for power fluctuations
I don’t understand this. If it’s about material transportation, I can give you some suggestions
Dry vulcanization is simpler than wet vulcanization; the temperature is increased as required without exceeding limits, and more temperature rise is applied after hydrogen sulfide penetrates – it’s just a matter of controlling the speed. We have already carried out dry vulcanization several times
I’ve not been exposed to the dry method. In the wet method, the vulcanizing agent is added to the vulcanization oil; but in the dry method, is there no vulcanization oil, and is the vulcanizing agent simply added directly to the circulating hydrogen?
Pay attention to the sulfurization principles: do not raise the temperature when adding sulfur, and do not add sulfur when raising the temperature, in order to prevent the catalyst from overheating. Wear proper personal protective equipment, and strictly follow the pre-sulfurization temperature increase curve. Personally, I find that dry pre-sulfurization is easier to handle than wet pre-sulfurization!
Previously, wet pre-sulfurization has always been used for processes such as diesel hydrogenation and hydrocracking; dry pre-sulfurization has not been tried. However, what libingtaoff8 said is correct: sulfur injection should be done without raising the temperature, and temperature elevation should occur without sulfur injection! I hope the original poster can share more about their experiences with dry pretreatment
It’s okay; the dry method is also very simple
During the initial heating stage of dry vulcanization, the temperature increase must be slow~ Make sure that hydrogen sulfide does not penetrate; the temperature should remain below 230~!
Be careful, especially when there are many newcomers; experienced workers need to be even more cautious. Well, I’ve never seen it happen, but I have heard of cases of poisoning.