How to increase the dry point of catalytic cracking diesel
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What causes the diesel dry point in a catalytic cracking unit not to increase? How to adjust!
I haven’t encountered it. What have you adjusted, the temperature? Voltage division? Extraction amount?
Due to the properties of the raw materials, it can sometimes be difficult to increase the dew point of diesel, but I have never encountered a situation where it’s impossible to raise the dry point of diesel. Could you provide the various operating parameters of the distillation tower?
What causes the 95% catalytic diesel level to be too low? http://bbs.hcbbs.com/thread-198850-1-1.html
Check the melting range of the raw material to see if it has become lighter
Raise the extraction temperature and the temperature of the baffle in the distillation tower; that should do it
It might be due to the crude oil used; another possibility is to switch to using diesel for extraction in order to raise the extraction temperature
There are many factors that affect the dry point of diesel oil; changes in the amount and temperature of side-stream extraction, variations in tower pressure, changes in the properties of the feedstock, as well as changes in the temperature and flow rate of the intermediate cycle reflux, can all influence the dry point of the side-stream distillate oil. Under normal circumstances, if the dry point of diesel is too low, the first thing to consider is raising the temperature of the diesel extraction plate appropriately.
What was said on the 2nd floor is correct; the question isn’t clear, so it’s impossible to answer.
We don’t handle the dry point for diesel; we only work with 95% points
Simply put, it is to move the recombined components upward
For the 95% point of diesel, in addition to proper control of the temperature at which the diesel is extracted, there are two other factors to consider: 1. Increasing the temperature of one of the trays in the distillation column； 2. Raise the dry point of gasoline, with components overlapping as little as possible.
We only analyze the 95% point! If the 95% point is too low, it is generally necessary to adjust the temperature or amount of material returning to the tower in the middle section, and increase the outlet for the lower fractions of diesel ； If the effect is not noticeable, then find ways to increase the heat in the lower part of the fractionation tower so that the heavier components can vaporize!
Raise the diesel extraction temperature a bit; that should increase the diesel dry point a little as well
The 95% point for diesel is low – what is the yield? Diesel boiling range? What are the slurry density and the amount of material discharged? At the same time, it takes into account the changes in the liquid level of the re-refining tank. 1. It is possible to adjust the reaction depth as well as the amount of oil slurry used for reprocessing. 2. Check the distillation temperatures of the re-refined oil and intermediate oil fractions. 3. Check the pressure drop in the fractionation tower to determine if there are signs of tray blockage (what is the solid content of the slurry?). 4. The reflux at the top is excessive, and there are signs of water presence. 5. Is there any liquid leakage at the top of the distillation tower?
It would be fine if the cutting width of the components were larger; in other words, just increase the distillation temperature
There are many factors that affect the dry point of diesel. It might be: the raw material components have become lighter ； Low pressure at the top of the tower ； The reaction temperature is high, etc.
Increase the temperature of the oil slurry returning to the tower, raise the temperature of the material returning from the middle section of the tower, and change the extraction point from the upper part to the lower part.
Increase the temperature of the oil slurry returning to the tower, raise the temperature of the material returning from the middle section of the tower, and change the extraction point from the upper part to the lower part.
Increase the temperature of the oil slurry returning to the tower, raise the temperature of the material returning from the middle section of the tower, and change the extraction point from the upper part to the lower part.
Increase the temperature of the oil slurry as it returns to the tower, raise the temperature for the middle and upper sections of the tower, and change the extraction method from upper extraction to lower extraction. --Note: This post was copied from the Haichuan Chemical Industry Forum; the address of this post is: http://bbs.hcbbs.com/viewthread.php?tid=443452