Tawin
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Why is the temperature at the top of the micro-positive pressure distillation column higher than that in the middle section of the column? I seek advice from experts
As the multi-component materials rise within the tower, mass and heat exchange occur; the high-boiling substances liquefy upon cooling, releasing heat which is then transferred to the low-boiling substances. These low-boiling substances vaporize and rise further, resulting in a high temperature at the top of the tower and a lower temperature in the middle layers.
As for the reason for the upward movement of the heavier components, the temperature gradient in the tray generally depends on the composition distribution of the medium on that tray. Are you sure this is the norm for you?
No, suddenly this situation occurred, and the tower separation effect declined
It is due to an imbalance in the ratio of light and heavy components on the tray. If it’s not an operational error, then the feed composition has changed.
There is another situation, which is rare, where the tray might tip over.
It’s a packed tower; is there a rich component at the top of the tower?