On the sulfidation of iron-molybdenum catalysts
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Our project involves converting coke oven gas into natural gas; the amount of iron-molybdenum catalyst used is approximately 300 m3 in total, including both large and small-sized iron-molybdenum catalysts as well as nickel-molybdenum catalysts； At present, we want to develop a vulcanization plan for putting it into operation. Due to the large volume of material to be processed, the manufacturer’s suggestion is to carry out the vulcanization in several batches; this approach results in a longer vulcanization time and requires a significantly increased operating time ； Has anyone used similar catalysts in series for sulfidation? ； During the sulfidation process, could it happen that a large amount of sulfur is released at the beginning, but the system hasn’t absorbed enough of it yet, leading to overheating? I hope those who have done it can share how to proceed.
Actually, the time required is more or less the same. It would be better to carry out vulcanization in two stages: one pre-hydrogenation followed by hydrogenation stage 1, and another pre-hydrogenation followed by hydrogenation stage 2. One set of pre-hydrogenation and hydrogenation stage 1 can be done together, while the other set uses pre-hydrogenation and hydrogenation stage 2
We have three stages: pre-hydrogenation + primary hydrogenation + secondary hydrogenation, so we plan to carry it out in three batches；
Actually, the vulcanization time for the three times is not very different. Moreover, vulcanizing them all at once is difficult to control and prone to problems. The solution provided by the manufacturer should be the optimal one. Besides, the most time-consuming step is ultra-finishing, which is also quite difficult to control in terms of temperature reduction, as the allowable temperature range is very narrow
The deciding factor is having sufficient air velocity; initially, they can be connected in series for cyclic heating and vulcanization!
Is T202C used for iron-molybdenum?