Consultation on the operation status of reactors in various hydrogenation units
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I’ve heard that some reactors suffer from severe coking, while the pressure drop in the reactors I’ve worked with hasn’t increased much. Do hydrogenation unit reactors tend to coking? What should be done if coking occurs? How to avoid or delay coking? How can coking be determined more accurately?
Are you referring to coking of the hydrogenation catalyst inside the reactor? Some degree of coking will always occur; for dealing with coking: it can be regenerated inside the reactor or taken out and sent to the relevant catalyst manufacturer for regeneration. To avoid coking, it is essential to prevent overheating and overpressure, as well as to stop the feed oil from becoming dirty. To determine coking, one mainly looks at the pressure drop; in addition, process parameters are monitored over time, and reaction activity is assessed based on experience.
Well, is catalyst coking related to the space velocity?
Catalyst coking is also related to the space velocity; too low a space velocity can lead to catalyst coking. Therefore, when the space velocity decreases, as long as the product quality remains satisfactory, the reactor inlet temperature should be reduced appropriately.
1. It is related to the hydrogen-to-oil ratio; in simpler terms, it is connected to the processing capacity of the unit as well as the amount of hydrogen used. 2. It is related to the properties of the feed oil; a deterioration in the quality of the feed oil from upstream units can also cause this issue. 3. It is related to the reaction temperature; excessively high reaction temperatures can easily lead to catalyst clogging. 4. The oil-to-agent ratio is too high.
What type of coking occurs in catalysts? ? ? ? Didn’t everyone learn about the properties of catalysts in middle school? ? ? It can only facilitate the progress of chemical reactions; it does not react on its own. Catalyst coking is mostly caused by the coking components in the feedstock reacting at high temperatures; these components cover the catalyst, causing it to become temporarily inactive. The catalyst can be removed and then heated to high temperatures to burn off the coking and restore its activity; this process is called regeneration. It’s problematic if metal substances deposit on the catalyst and poison its active sites. Note that regeneration also restores 85% of the catalyst’s performance. Strictly control the gums in the raw materials by implementing a raw material filtration system. Generally, the optimal effective activity of a catalyst lasts for about 2 years.
It is mainly related to the reaction raw materials and reaction conditions. If there are many substances in the raw materials that can produce gelatin, and the hydrogen available for the reaction is insufficient, coking is likely to occur. However, this issue is quite complex; you can ask more details.