Relationship between the bottom liquid level and bottom pressure in a distillation column
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The company has 3 vacuum distillation towers. When the liquid level in the bottom of the tower rises, the pressure there also increases. Sometimes, when the level gauge is inaccurate, the pressure at the bottom of the tower is used to determine the liquid level. Why does the liquid level in the bottom of the tower affect its pressure? Could it be that a high liquid level affects the heat exchange in the reboilers (two of which are forced-circulation reboilers and one is a siphon type), or is there some other reason? Please share your thoughts
Since there could be other reasons, other factors should be provided, such as the previous flowchart or something similar. Talking about pictures is more intuitive. For reference.
In negative pressure distillation, under normal conditions the evaporation of the material in the tower bottom reaches an equilibrium point; therefore, the liquid level fluctuates with changes in pressure