Problems with hydrogenation refining catalysts
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Why is there a lot of dust after using the hydrorefining catalyst? How to avoid or reduce dust?
There’s no good solution, as cobalt-molybdenum catalysts are quite brittle, and a small amount of them broke during the loading process.
Start with the raw materials to overcome the impact of carbon buildup on the catalyst, and improve filter operation. Address large pressure differences promptly. Extend the service life of the catalyst.
In my opinion, the dust mainly consists of carbon deposition on the catalyst surface and mechanical impurities carried in the feed oil. During previous major overhauls of the equipment, when the cover of the first refining reactor was opened, the distribution plates at the top were covered with black dust; the particle size of this dust seemed to be very small. The dust level in the subsequent reactors was significantly lower. In my opinion, it’s better to exercise stricter control over the raw materials. Additionally, the bed temperature should be kept as low as possible to prevent carbon buildup resulting from catalyst coking.
The catalyst bed must be flushed before it is put into formal use; otherwise, there will be a lot of dust
There are all experts upstairs, and what they say is quite good. I would like to add that a high water content in the materials can also reduce the strength of the catalyst.
Whether due to the fragmentation of the catalyst during loading or coking during actual operation, the presence of dust in the catalyst is inevitable; it can only be controlled. 1. Operate carefully during the loading process to minimize fragmentation. 2. During operation, maintain an appropriate hydrogen-to-oil ratio and as low a reaction temperature as possible (to meet production requirements) in order to reduce coking. 3. Control the quality of raw materials, strengthen the management of raw material filters, and reduce the entry of mechanical impurities. 4. Ensure stable operation and reduce fluctuations.