Aromatic hydrocarbon separation
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https://bbs.hcbbs.com/forum.php?mod=image&aid=1475481&size=300x300&key=1aa76700585b1221&nocache=yes&type=fixnone The function of the process pipeline from air cooling to the reflux tank is as shown in the figure. The medium at the circled point is xylene.
From the picture, it seems that a liquid seal is made, but I have no idea of its specific function. I guess that the inside of this pipe must be sealed by liquid during normal operation. When the tower is overpressured, the liquid seal may be broken, which plays a protective role. However, generally the top of the tower is protected by a safety valve. This setting method seems to be that there is no safety valve on the top of the tower, and the safety valve is set on the tank. When the tower is overpressured, we are worried about the large amount of gas phase, so we set up such a facility.
There is a safety valve at the top of the tower. Thanks for the answer
In order to fully cool down, prevent air blockage, right?