The gas components in the flash tank of the catalytically refined rich liquid contain propylene
Thread Content
In the catalytic product refining unit, the propylene content in the vapor from the rich liquid flash tank is relatively high; the analysis value ranges from 16% to 19%. Could someone please explain why this is the case? Could it be that ethanolamine is carrying along propylene? Seeking advice. Thank you
Overabsorbed? Try raising the absorption temperature and see how it works The prerequisite is to ensure an effective absorption effect!
The temperature of the lean liquid should not be too low, otherwise some of the components in the dry gas and liquefied gas will be cooled and carried along!
The propylene content in the flash vapor from the rich liquid can reach 17–19%; the temperature of the lean liquid after cooling is around 34 degrees, and there are no issues with the pressure in the process. Please advise
Actually, it is normal for the rich liquid flash vapor to contain light hydrocarbons, but these light hydrocarbons should not be carried into the regeneration tower that follows. I’m not sure what requirement your company has in this regard
The main concern is that the propylene loss is a bit high
We just put a torch to it and burned it
This is unavoidable; I can only suggest trying the following approaches: 1. Ensure that the temperature of the lean liquid is slightly higher than that of the liquefied gas； 2. Raise the level of the desulfurization tower to provide sufficient separation time between the rich liquid and the liquefied gas ； 3. Control an appropriate circulation volume.