【Q&A Question 026】May 16, 2016
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【Q&A Question 026】May 16, 2016: Why was straight-run oil used for initial activity stabilization after the catalyst pre-sulfidization was completed? The answer key will be available after responding; scoring is based on addressing the key points. After the pre-sulfurization of the catalyst is completed, its reaction activity is extremely high. Since straight-run oil contains low levels of olefins, its low reaction activity makes the reaction easier to control.
After the pre-sulfurization of the catalyst is completed, its reaction activity is extremely high. Since straight-run oil contains low levels of olefins, its low reaction activity makes the reaction easier to control.
The mobile app keeps having network issues! ! After pre-sulfidization, the catalyst achieves its highest activity; however, it is prone to temperature spikes that cause coking in the bed, so straight-run oil is used for passivation
The catalysts after sulfidization exhibit high activity. The oil obtained after secondary processing contains unsaturated hydrocarbons, and catalysts with high activity tend to react violently upon contact with these unsaturated hydrocarbons. It is difficult to control the reaction temperature, and the condensation process leads to the formation of coke, thereby deactivating the catalyst.
(1) At the end of catalyst presulfurization, the initial activity and acidic functionality are at their strongest； (2) If it comes into contact with low-quality raw materials, especially secondarily processed distillate oils such as catalytic diesel and coker diesel at this time, intense hydrogenation reactions will occur, and cracking reactions may even take place, which can easily lead to overheating ； (3) Additionally, the carbon deposition on the catalyst surface occurs at a particularly fast rate, causing the catalyst to become deactivated rapidly and affecting its normal activity level during the stable period of activity. Therefore, straight-run oil should be selected.
1 When catalyst presulfidization is completed, the initial activity and acidity are at their strongest； 2 If it comes into contact with low-quality raw materials, especially secondary processed distillate oils such as catalytic diesel and coker diesel at this time, intense hydrogenation reactions will occur, and cracking reactions may even take place, which can easily lead to overheating ； 3 Additionally, the rate of carbon deposition on the catalyst surface is particularly high, causing the catalyst to become deactivated rapidly and affecting its normal activity level during the stable period of activity. Therefore, straight-run oil should be selected.
The device I built doesn’t have such a term! Guess, is it because of nitrogen?