Regarding the operation of hydrorefining
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My unit is operating normally, but during operation, due to the high activity of the catalyst at the beginning, it was not possible to raise the temperature to the designed level. Currently, the operating temperature is much lower than the specified value. However, if the temperature is too low, nitrogen may not be removed completely during the refining reaction, which could lead to coking and deactivation of the reforming agent. Do you have any good suggestions?
Choose crude oil with good quality, low in sulfur, nitrogen, and chlorine, as well as containing few other impurities. Additionally, select straight-run oil with low levels of olefins or aromatics to reduce the temperature rise in the reactor!
Are you guys new to the setup? What process? The new catalyst has higher activity, enabling the product requirements to be met at lower thresholds. If, in the new unit, the temperature of the preceding reactor remains within the specified range while the temperature of the subsequent reactors fails to increase, it may be due to the influence of the temperature of the preceding reactor; process defects should be considered in this case. Old devices generally don’t experience this phenomenon, right? Product analysis, or changes in the properties of raw materials, catalyst filling and vulcanization, instrument issues.
High-quality raw materials can be selected, and the reaction pressure can be increased to boost the N removal rate.
Let’s first analyze the nitrogen content in refined oil!
After the modifier comes the refining agent, so it’s not possible to conduct laboratory analyses before using the modified bed layer~!
The main issue is that the modifier has high requirements regarding nitrogen content; even a small amount of organic nitrogen can cause the modifier to coking and become inactive. The process specifications specify that the nitrogen content in the crude oil in contact with the modifier should be 20 PPM
At the beginning, it’s sufficient to specify the nitrogen content of the crude oil!
Shouldn’t it be refined first and then modified? In what ways is the high activity you mentioned manifested? If the product requirements can be met at the design temperature, there is no need to necessarily reach that temperature; after all, the design temperature is a reference value established once the catalyst’s activity becomes stable
Refinants, modifiers – the main issue is excessive errors; nitrogen removal is inherently more difficult than sulfur removal. Although operating at low temperatures can help meet the requirements, it does not guarantee complete removal of organic nitrogen