Does anyone know the relationship between the bottom temperature of a distillation column and the boiling point of the heavy components?
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I would like to ask fellow sailors: the bottom pressure of the main acetic acid distillation tower is at 128–132°C, with a pressure of 0.045–0.055 MPa; the product obtained from the bottom of the tower is acetic acid with a purity of 99.5%. The boiling point of acetic acid is around 116°C, so will it still be in liquid form at the bottom? Why doesn’t acetic acid vaporize?
At the corresponding saturated vapor pressure, a liquid is present. If the extracted material is not cooled, it will definitely vaporize upon returning to normal pressure after being extracted.
The bottom of the tower should also contain a gas-liquid mixture; after coming out from the bottom of the tower, there should be a cooler
116 is the normal boiling point, not at 0.045-0.055
Pressure corresponds one-to-one with boiling point. No matter which factor is discussed, another factor must be taken into account. That is, what is the boiling point at that pressure. Therefore, at the operating pressure of this tower, acetic acid at this temperature will not be in a liquid state. Or it can be seen by checking the material property table.