Questions regarding the pressure drop in distillation columns
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It’s actually a very basic question. I would like to ask: does the pressure drop in a distillation column refer to the difference between the pressure in the condenser and the pressure in the reboiler, or rather the difference between the pressure at the top of the column and the pressure in the reboiler? Also, what pressure is meant by the operating pressure of a distillation column? Is it the pressure in the condenser? I want to clarify these concepts; please provide an answer
The difference between the pressure of the condenser and the pressure of the reboiler
The column pressure difference refers to the difference between the top pressure of the column and the pressure in the reboiler; the operating pressure generally refers to the top pressure of the column.
Sure enough, people still have different opinions; it seems that what the teacher said is also a bit different. Is there no fixed standard for this?
The pressure difference between the top and bottom of the tower is a value that is generally monitored during operation; process control is achieved by using the difference between these two values!
It should be based on the pressure at the top of the tower, right? If it’s based on the pressure in the condenser, doesn’t that increase the resistance in the pipelines?
Agree with what was said on the third floor: victory:
It mainly refers to the resistance to the upward movement of gases, which can be seen from the pressure difference across the packing. The greater the pressure difference, the higher the evaporation rate. However, if the evaporation rate is too high, liquid flooding and foam entrainment can occur; more seriously, there is a risk of the packing or tray being blown away.
Basic concepts, refer to the principles of chemical engineering, pressure difference between the top and bottom of the tower. It is mainly related to the pressure loss in the tray or packing section, and not directly related to the condenser or reboiler.