Why is the pressure at the top of a distillation tower higher than the pressure at the bottom? Let’s discuss this together.
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Why is the pressure at the top of a distillation tower higher than the pressure at the bottom? Let’s discuss this together.
It’s a good question; I don’t know either. But could it be the reason why the heavier components move upward? ? ? ?
The reflux temperature is too high, resulting in less cooling capacity at the tower top
The top of the tower is a fractional condenser; insufficient gas-phase extraction will lead to an increase in the pressure at the tower top； The top of the tower is a total condenser; too high a temperature of the reflux liquid can cause an increase in pressure at the top of the tower
I think there are the following reasons: 1. Significant backflow, resulting in low recovery rates; 2. A large amount of non-condensable gases at the top of the tower; 3. Excessively high feed temperature, causing rapid rise of the gas phase; 4. High temperatures inside the tower. These are just my personal opinions
Reply to 2# wan932: The phenomenon of the heavier components moving upward occurs when the pressures at the bottom and top of the tower remain unchanged, the temperature at the bottom of the tower stays the same, while the temperature at the top of the tower rises